技术领域technical field
本发明涉及一种饱和软土离心渗流装置。The invention relates to a centrifugal seepage device for saturated soft soil.
背景技术Background technique
土体渗透特性是岩土工程特性研究的重要方面，度量土体渗透特性指标是渗透系数，现有测量渗透系数的实验装置主要有常水头达西渗流仪和变水头达西渗流仪，该实验仪器对砂土渗透系数测量具有准确性高、技术成熟等优点。Soil permeability characteristics are an important aspect of geotechnical engineering characteristics research. The index to measure soil permeability characteristics is permeability coefficient. The existing experimental devices for measuring permeability coefficient mainly include constant head Darcy seepage meter and variable head Darcy seepage meter. The experiment The instrument has the advantages of high accuracy and mature technology for the measurement of sandy soil permeability coefficient.
但饱和软土具有含水率高、压缩性高、孔隙比高、承载能力低、渗透小“三高两低”的特性，其渗流往往表现出非达西渗流特性。应用现有的常水头达西渗流仪和变水头达西渗流仪对软土渗透系数测量将导致结果偏离工程实际，无法指导岩土工程勘察，很有可能给岩土工程设计、施工带来巨大的损失。However, saturated soft soil has the characteristics of high water content, high compressibility, high void ratio, low bearing capacity, and low seepage "three highs and two lows", and its seepage often shows non-Darcy seepage characteristics. Using the existing constant head Darcy seepage meter and variable head Darcy seepage meter to measure the permeability coefficient of soft soil will cause the results to deviate from the actual engineering and cannot guide the geotechnical engineering investigation. Loss.
随着城市进程的不断加快，地铁、铁路、公路等交通工程发展迅速，中国已建和在建的高速铁路工程位居世界首位。岩土工程勘察更为关注不同频率动荷载对软土工程特性和污染物在土中迁移问题，尤其是动荷载和离心耦合作用下在软土渗流特性问题，目前仍采用现有的常水头达西渗流仪和变水头达西渗流仪对软土渗透系数测量，与工程实践不符，更不能模拟污染物如何在土中迁移，缺乏相应的实验装置。With the continuous acceleration of the urban process, transportation projects such as subways, railways, and highways have developed rapidly. China's high-speed railway projects that have been built and are under construction rank first in the world. Geotechnical engineering investigation pays more attention to the impact of different frequency dynamic loads on the engineering properties of soft soil and the migration of pollutants in the soil, especially the seepage characteristics of soft soil under the dynamic load and centrifugal coupling. Currently, the existing constant head detector is still used The measurement of the permeability coefficient of soft soil by the West seepage meter and the variable head Darcy seepage meter is inconsistent with engineering practice, let alone simulate how pollutants migrate in the soil, and there is a lack of corresponding experimental devices.
所以人们开始越来越关注对软土渗流特性的研究，并将理论研究与工程经验累积的研究成果应用于工程实践中。Therefore, people began to pay more and more attention to the study of seepage characteristics of soft soil, and applied the research results accumulated from theoretical research and engineering experience to engineering practice.
离心机模型试验被国际公认为是研究岩土动力学问题最有效、最先进的科学试验平台。1931年美国哥伦比亚大学首先研制出世界上第一台半径为0.25m的土工离心机，19世纪70年代初，土工离心机在美、英、苏联、法、日等国相继发展，研制出转台式离心机、吊篮式离心机和鼓式离心机，我国于19世纪80年代开始重视动力离心机技术，1982年由长江科学研究院简称，最大离心加速度达到300g，容量150g-t有效半径3m。截止目前，我国拥有20多台离心机。试验模型能够真实准确地反映原型的性态和行为，模型与原型之间需要满足几何相似、运动相似和动力相似关系三个基本条件，即对应于各参数的相似准则和参数之间的协调关系。The centrifuge model test is internationally recognized as the most effective and advanced scientific test platform for studying rock and soil dynamics. In 1931, Columbia University in the United States first developed the world's first geotechnical centrifuge with a radius of 0.25m. In the early 1870s, geotechnical centrifuges were successively developed in the United States, Britain, the Soviet Union, France, Japan and other countries, and the rotary table centrifuge was developed. Centrifuges, hanging basket centrifuges and drum centrifuges, our country began to pay attention to power centrifuge technology in the 1880s. It was abbreviated by the Yangtze River Science Research Institute in 1982. The maximum centrifugal acceleration reaches 300g, and the capacity is 150g-t. The effective radius is 3m. Up to now, my country has more than 20 centrifuges. The test model can truly and accurately reflect the behavior and behavior of the prototype. The model and the prototype need to meet the three basic conditions of geometric similarity, motion similarity and dynamic similarity, that is, the similarity criterion corresponding to each parameter and the coordination relationship between parameters .
传统的转台式离心机、吊篮式离心机和鼓式离心机虽然能达到离心渗流的效果，但由于操作复杂，渗流仪的体量大，试验费用高，试验精度低等特点，都导致无法简单、方便和准确的测量出在离心荷载作用下饱和软土的渗透系数。Although traditional rotary centrifuges, hanging basket centrifuges and drum centrifuges can achieve the effect of centrifugal seepage, due to the complex operation, large volume of seepage meter, high test cost, and low test accuracy, it is impossible to Simple, convenient and accurate measurement of the permeability coefficient of saturated soft soil under centrifugal load.
传统的离心筒大都利用离心加速度将两种不同物质分离开来，考虑不同的物质成分分析。但是没有考虑和设计离心筒来模拟饱和软土的渗流问题。Most of the traditional centrifuges use centrifugal acceleration to separate two different substances, considering different material composition analysis. However, the centrifuge was not considered and designed to simulate the seepage problem of saturated soft soil.
现有的实验仪器往往很难方便和准确的模拟在离心荷载作用下饱和软土的渗透系数。Existing experimental instruments are often difficult to simulate the permeability coefficient of saturated soft soil under centrifugal load conveniently and accurately.
发明内容Contents of the invention
本发明的目的是提供一种在离心作用下测量饱和软土渗透系数所采用的饱和软土离心渗流装置。技术方案如下：The object of the present invention is to provide a centrifugal seepage device for saturated soft soil used for measuring the permeability coefficient of saturated soft soil under centrifugal action. The technical scheme is as follows:
一种饱和软土离心渗流装置，用于测量离心作用下饱和软土渗透系数，包旋转电机60、玻璃刻度旋转筒66、蓄水池10和玻璃刻度筒64，所述的玻璃刻度旋转筒66包括带有刻度的筒壁、同轴的大空心圆柱透水石20和小空心圆柱透水石8，其材料为透水混凝土；玻璃刻度旋转筒66中部为伸出筒底部的电机转轴4；大空心圆柱透水石20的内壁和小空心圆柱透水石8的外壁之间形成土样槽9，在土样槽9内壁贴有滤纸6，并放置有饱和土样；由带有刻度的筒壁和大空心圆柱透水石20外壁形成的空腔被称为集水池3；A saturated soft soil centrifugal seepage device, used to measure the permeability coefficient of saturated soft soil under centrifugal action, including a rotating motor 60, a glass scale rotating cylinder 66, a water storage tank 10 and a glass scale cylinder 64, the glass scale rotating cylinder 66 It includes a cylinder wall with a scale, coaxial large hollow cylinder permeable stone 20 and small hollow cylinder permeable stone 8, the material of which is permeable concrete; the middle part of the glass scale rotating cylinder 66 is the motor shaft 4 protruding from the bottom of the cylinder; the large hollow cylinder A soil sample tank 9 is formed between the inner wall of the permeable stone 20 and the outer wall of the small hollow cylindrical permeable stone 8, and a filter paper 6 is pasted on the inner wall of the soil sample tank 9, and a saturated soil sample is placed; The cavity formed by the outer wall of the cylindrical permeable stone 20 is called the sump 3;
小空心圆柱透水石8与电机转轴4之间的空腔21与位于其下方的所述蓄水池10相连通，蓄水池10通过水管12与玻璃刻度筒64相连，玻璃刻度筒64的位置高于玻璃刻度旋转筒66，使得玻璃刻度筒64中的水顺利流入玻璃旋转刻度筒66；电机转轴4受旋转电机60的驱动，带动旋转玻璃刻度旋转筒66中的土样槽9的土样做离心运动。The cavity 21 between the small hollow cylindrical permeable stone 8 and the motor shaft 4 communicates with the reservoir 10 below it, and the reservoir 10 is connected to the glass scale cylinder 64 through the water pipe 12, and the position of the glass scale cylinder 64 is Higher than the glass scale rotary cylinder 66, so that the water in the glass scale cylinder 64 smoothly flows into the glass rotary scale cylinder 66; the motor shaft 4 is driven by the rotary motor 60 to drive the soil sample in the soil sample tank 9 in the rotary glass scale rotary cylinder 66 Do centrifugal exercises.
附图说明Description of drawings
图1为饱和软土振动离心渗流仪振动平台连接图；Fig. 1 is the connection diagram of the vibrating platform of the vibrating centrifugal seepage instrument for saturated soft soil;
图2为饱和软土振动离心渗流仪第一、第二振动拉压加载控制原理图；Fig. 2 is a control schematic diagram of the first and second vibration tension and compression loading of the saturated soft soil vibratory centrifugal seepage instrument;
图3为饱和软土振动离心渗流仪渗流连接图Figure 3 is the seepage connection diagram of the vibrating centrifugal seepage meter for saturated soft soil
图4为饱和软土振动离心渗流计算原理图；Figure 4 is a schematic diagram of the calculation principle of vibration centrifugal seepage in saturated soft soil;
图中1、驱动杆；2、第一弹簧；3、集水池；4、电机转轴；5、泄压阀；6、滤纸；8、小空心圆柱透水石；9、土样槽；10、储水池；11、活塞电机；12、水管；17、旋转电机开关；18、振动平台；20、大空心圆柱透水石；21、空腔；22、第二弹簧；23、支架；24、调节阀；25、变频器；27、第一刚性杆；32、第二刚性杆；35、第一活塞；36、第一活塞缸；37、第二活塞缸；38、第二活塞；39、钢柱；40、第一单向阀；41、第二单向阀；42、水槽箱；60、旋转电机；61、旋转桶底座；64、玻璃刻度筒；66、玻璃刻度旋转筒。Among the figure 1, driving rod; 2, first spring; 3, water collection tank; 4, motor shaft; 5, pressure relief valve; 6, filter paper; 8, small hollow cylindrical permeable stone; 9, soil sample tank; Pool; 11, piston motor; 12, water pipe; 17, rotary motor switch; 18, vibration platform; 20, large hollow cylindrical permeable stone; 21, cavity; 22, second spring; 23, bracket; 24, regulating valve; 25. Frequency converter; 27. First rigid rod; 32. Second rigid rod; 35. First piston; 36. First piston cylinder; 37. Second piston cylinder; 38. Second piston; 39. Steel column; 40. The first one-way valve; 41. The second one-way valve; 42. The water tank; 60. The rotating motor; 61. The base of the rotating barrel; 64. The glass scale cylinder; 66. The glass scale rotating cylinder.
具体实施方式detailed description
为进一步了解本发明的发明内容、特点及功效，现结合本发明的应用场景，并配合附图进行详细说明。In order to further understand the invention content, features and effects of the present invention, the application scenarios of the present invention are combined with the accompanying drawings to describe in detail.
本发明为饱和软土振动离心渗流仪的一个重要组成部分。整个饱和软土振动离心渗流仪主要包含本发明的饱和软土离心渗流装置和振动平台两个部分。本发明的饱和软土离心渗流装置，主要包括旋转电机60、玻璃刻度旋转筒66、蓄水池10和玻璃刻度筒64。由蓄水池10和玻璃刻度筒64构成注水部分。The invention is an important component of the vibrating centrifugal seepage meter for saturated soft soil. The entire saturated soft soil vibration centrifugal seepage instrument mainly includes two parts: the saturated soft soil centrifugal seepage device and the vibration platform of the present invention. The saturated soft soil centrifugal infiltration device of the present invention mainly includes a rotating motor 60 , a glass scale rotating cylinder 66 , a water storage tank 10 and a glass scale cylinder 64 . The water injection part is constituted by the reservoir 10 and the glass scale cylinder 64 .
在图1中，振动平台18的一侧通过水平弹簧2与支架23相连，另一侧通过第一刚性杆27与第一加载控制台19的钢柱39固定连接，由第一加载控制台19控制做水平方向振动；振动平台18的下部通过竖直弹簧22与支架相连，振动平台18的中部通过第二刚性杆32与第二加载控制台43的钢柱39固定连接，由第二加载控制台43控制做竖直方向振动；在振动平台18上固定有旋转电机60，In Fig. 1, one side of the vibration platform 18 is connected with the bracket 23 through the horizontal spring 2, and the other side is fixedly connected with the steel column 39 of the first loading console 19 through the first rigid rod 27, and the first loading console 19 Control to vibrate in the horizontal direction; the bottom of the vibration platform 18 is connected to the support by the vertical spring 22, and the middle part of the vibration platform 18 is fixedly connected with the steel column 39 of the second loading console 43 by the second rigid bar 32, controlled by the second loading Platform 43 controls to vibrate in the vertical direction; On the vibration platform 18, a rotary motor 60 is fixed,
在图2中，两个加载控制台的结构相同，包括驱动杆1，变频器25，活塞电机11，第一活塞缸36，第一活塞35，第一单向阀40，水槽箱42，第二单向阀41，第二活塞缸37，第二活塞38，钢柱39，调节阀24。工作原理：开启交流稳压电源，通过主控制器控制变频器25，从而改变活塞电机11的旋转速度，与活塞电机11相连的驱动杆1来驱动第一活塞缸36中第一活塞35的往复运动；当第一活塞35向上运动时，并在压力作用下，水槽箱42中的水通过第一管路中的第一单向阀40向上运动，进入到第一活塞缸36；当第一活塞35向下运动，第一活塞缸36中的水通过第二管路中的第二单向阀41进入到第二活塞缸37，并提升第二活塞38，并带动钢柱39向上运动。当第一活塞缸36中的水全部压入到第二活塞缸37时，通过主控制器控制调节阀24开端度，控制第二活塞缸37中水释放的用水量，达到对钢柱39的控制，使钢柱39按照一定的速度向下运动；位移传感器与钢柱39相连，当钢柱39运动过程中，位移传感器将钢柱39往复运动信号输入到计算机中。在计算机中，可以观察钢柱39是否按照正弦波、方形波和三角形波进行运动。两个加载控制台的结构相同，钢柱39分别通过第一刚性杆27和第二刚性杆32与振动平台18右侧和底下刚性相连，从而实现水平和竖向拉压振动。In Fig. 2, the structure of the two loading consoles is the same, including the driving rod 1, the frequency converter 25, the piston motor 11, the first piston cylinder 36, the first piston 35, the first one-way valve 40, the tank box 42, the first Two one-way valves 41, the second piston cylinder 37, the second piston 38, the steel column 39, and the regulating valve 24. Working principle: turn on the AC stabilized voltage power supply, control the frequency converter 25 through the main controller, thereby changing the rotation speed of the piston motor 11, and the drive rod 1 connected with the piston motor 11 drives the first piston 35 in the first piston cylinder 36 to reciprocate Movement; when the first piston 35 moves upwards, and under the action of pressure, the water in the tank case 42 moves upwards through the first one-way valve 40 in the first pipeline, and enters the first piston cylinder 36; when the first The piston 35 moves downward, and the water in the first piston cylinder 36 enters the second piston cylinder 37 through the second one-way valve 41 in the second pipeline, lifts the second piston 38, and drives the steel column 39 to move upward. When all the water in the first piston cylinder 36 is pressed into the second piston cylinder 37, the opening degree of the regulating valve 24 is controlled by the main controller to control the amount of water released by the water in the second piston cylinder 37 to reach the steel column 39. control, so that the steel column 39 moves downward according to a certain speed; the displacement sensor is connected with the steel column 39, and when the steel column 39 is moving, the displacement sensor inputs the reciprocating motion signal of the steel column 39 into the computer. In the computer, it can be observed whether the steel column 39 moves according to a sine wave, a square wave or a triangular wave. The two loading consoles have the same structure, and the steel column 39 is rigidly connected to the right side and the bottom of the vibration platform 18 through the first rigid rod 27 and the second rigid rod 32 respectively, so as to realize horizontal and vertical tension and compression vibrations.
在图3中，玻璃刻度旋转筒66包括带有刻度的筒壁、同轴的大空心圆柱透水石20和小空心圆柱透水石8，其材料为透水混凝土；玻璃刻度旋转筒66中部为伸出筒底部的电机转轴4；在大空心圆柱透水石20和小空心圆柱透水石8之间放置有饱和土样，并在土样的内径和外径表面处贴上滤纸6。In Fig. 3, the glass scale rotating cylinder 66 includes a cylinder wall with a scale, a coaxial large hollow cylindrical permeable stone 20 and a small hollow cylindrical permeable stone 8, the material of which is permeable concrete; the middle part of the glass scale rotating cylinder 66 is a protrusion The motor shaft 4 at the bottom of the cylinder; a saturated soil sample is placed between the large hollow cylindrical permeable stone 20 and the small hollow cylindrical permeable stone 8, and filter paper 6 is pasted on the inner diameter and outer diameter surface of the soil sample.
在图3中，注水部分主要包括储水池10和玻璃刻度筒64。在小空心圆柱透水石8与电机转轴4之间的空腔21通过水管12、储水池10与玻璃刻度筒64相连，玻璃刻度筒64的位置高于玻璃刻度旋转筒66，使得玻璃刻度筒64中的水顺利流入玻璃旋转刻度筒66；电机转轴4受旋转电机60的驱动带动旋转玻璃刻度旋转筒66中的土样槽9的土样做离心运动。In FIG. 3 , the water injection part mainly includes a water storage tank 10 and a glass scale cylinder 64 . The cavity 21 between the small hollow cylindrical permeable stone 8 and the motor shaft 4 is connected to the glass scale cylinder 64 through the water pipe 12 and the water storage tank 10, and the position of the glass scale cylinder 64 is higher than the glass scale rotating cylinder 66, so that the glass scale cylinder 64 The water in the glass smoothly flows into the glass rotating scale cylinder 66; the motor shaft 4 is driven by the rotating motor 60 to drive the soil sample in the soil sample tank 9 in the rotating glass scale rotating cylinder 66 to do centrifugal motion.
在图4中，本发明饱和软土振动离心渗流仪渗透系数计算，依据集水池出水量和时间获得如下两个公式，其一：仅开启加载控制台，关闭电机旋转控制器，有In Fig. 4, the permeability coefficient of the vibrating centrifugal seepage meter for saturated soft soil of the present invention is calculated, and the following two formulas are obtained according to the water output of the sump tank and the time, one: only open the loading console, close the motor rotation controller, and have
其二，开启电机旋转控制器，关闭或者开启加载控制台，有Second, turn on the motor rotation controller, turn off or turn on the loading console, and
其中a＝w2r＝Nrgwhere a=w2 r=Nr g
ΔQ——出水量(L)；ΔQ——Water output (L);
Δt——渗流时间；Δt—seepage time;
λ——软土渗流修正系数；λ—soft soil seepage correction coefficient;
w——旋转电机60旋转的角速度；w——the angular velocity of the rotary motor 60 rotation;
g——重力加速度；g - acceleration of gravity;
ri——电机转轴4的中心线到小空心圆柱透水石8的距离；ri - the distance from the center line of the motor shaft 4 to the small hollow cylindrical permeable stone 8;
r0——电机转轴4的中心线到大空心圆柱透水石20的距离；r0 ——the distance from the center line of the motor shaft 4 to the large hollow cylindrical permeable stone 20;
r——为电机转轴4的中心线到玻璃刻度旋转筒66的距离；r——the distance from the center line of the motor shaft 4 to the glass scale rotating cylinder 66;
Nr——相似性系数；Nr —similarity coefficient;
Pw——通过土样后的压力差。Pw＝ρwgΔh；Pw —the pressure difference after passing through the soil sample. Pw = ρw gΔh;
ρw——水的密度；ρw ——the density of water;
Δh——水头损失，即试验开始和试验结束时玻璃刻度筒数值差Δh＝h1-h2；Δh——water head loss, that is, the difference between the value of the glass scale cylinder at the beginning of the test and the end of the test Δh=h1 -h2 ;
现以模拟动荷载和离心耦合作用下饱和软土渗透系数的试验为例，说明本发明的具体使用过程，具体实施步骤如下：Now take the test of the saturated soft soil permeability coefficient under the simulated dynamic load and centrifugal coupling as an example to illustrate the specific application process of the present invention, and the specific implementation steps are as follows:
(1)试验系统按照附图组装完毕后，首先将土样槽9内侧放入浸过水的滤纸6，并检查小空心圆柱透水石8和大空心圆柱透水石20是否堵塞，然后再将饱和软土试样放入土样槽9；(1) After the test system is assembled according to the accompanying drawings, first put the filter paper 6 soaked in water into the inside of the soil sample tank 9, and check whether the small hollow cylindrical permeable stone 8 and the large hollow cylindrical permeable stone 20 are blocked, and then the saturated Soft soil sample is put into soil sample groove 9;
(2)将玻璃刻度筒64放在高于旋转刻度筒66的位置，将空腔21注满水，读取玻璃刻度筒64的数值h1；(2) The glass scale cylinder 64 is placed at a position higher than the rotating scale cylinder 66, the cavity 21 is filled with water, and the numerical valueh1 of the glass scale cylinder 64 is read;
(3)开启振动台18，通过主控制台选择相应频率的波形，以及通过第一加载控制台控制水平方向的振动或者第二加载控制台控制竖向位移，根据计算机采集的钢柱39的运动情况调节两个加载控制台振动频率。(3) Turn on the vibrating table 18, select the waveform of the corresponding frequency by the main console, and control the vibration in the horizontal direction by the first loading console or the vertical displacement by the second loading console, according to the motion of the steel column 39 collected by the computer The case regulates the vibration frequency of the two loading consoles.
(4)开启旋转电机开关17，通过旋转电机确定旋转速度ω；(4) Turn on the rotary motor switch 17 to determine the rotational speed ω by the rotary motor;
(5)确定渗水时间Δt，并记录玻璃刻度旋转筒66出水量ΔQ值，再次读取玻璃刻度的数值h2；(5) Determine the water seepage time Δt, and record the water output ΔQ value of the glass scale rotating cylinder 66, and read the value h2 of the glass scale again;
(6)通过上述公式计算渗透系数，结束试验。(6) Calculate the permeability coefficient by the above formula, and end the test.
采用本发明的饱和软土离心渗流装置的渗流仪，具有以下优点：1、以饱和软土为研究对象，能够真实模拟离心荷载作用下软土的渗流特性，计算出的渗透系数值更加真实有效；2、通过出水量参数ΔQ和时间Δt以及玻璃刻度筒两个度数h1、h2，就能确定水头损失和渗透系数，参数少，方便；3、将本发明的离心渗流装置和振动台结合在一起，能够考虑振动和离心耦合效应对饱和软土渗透特性的影响，简单易行。总之，结构设置简单、方便、试验费用低；测定饱和软土渗透系数更准确，更加接近于真实情况。The seepage meter adopting the saturated soft soil centrifugal seepage device of the present invention has the following advantages: 1. Taking saturated soft soil as the research object, the seepage characteristics of the soft soil under the centrifugal load can be truly simulated, and the calculated permeability coefficient value is more real and effective ; 2. Through the water output parameter ΔQ and time Δt and the two degrees h1 and h2 of the glass scale cylinder, the water head loss and the permeability coefficient can be determined, with few parameters and convenience; 3. The centrifugal seepage device of the present invention and the vibration table Combined, it is simple and easy to consider the influence of vibration and centrifugal coupling effects on the permeability characteristics of saturated soft soil. In short, the structure setting is simple, convenient, and the test cost is low; the determination of the permeability coefficient of saturated soft soil is more accurate and closer to the real situation.
尽管上面结合附图对本发明的某一实施例进行了描述，但是本发明并不是局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，并不是局限性的，本领域的普通技术人员在本发明的启示下，在不脱离本发明宗旨和权利要求所保护的范围情况下，还可以做出很多形式，这些均属于本发明的保护范围之内。Although a certain embodiment of the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific implementation. The above-mentioned specific implementation is only illustrative and not limiting. Under the enlightenment of the present invention, without departing from the gist of the present invention and the protection scope of the claims, the skilled person can also make many forms, and these all belong to the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610526244.2ACN106018242B (en) | 2016-07-06 | 2016-07-06 | A centrifugal seepage device for saturated soft soil |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610526244.2ACN106018242B (en) | 2016-07-06 | 2016-07-06 | A centrifugal seepage device for saturated soft soil |
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| CN106018242Atrue CN106018242A (en) | 2016-10-12 |
| CN106018242B CN106018242B (en) | 2019-02-22 |
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| CN201610526244.2AActiveCN106018242B (en) | 2016-07-06 | 2016-07-06 | A centrifugal seepage device for saturated soft soil |
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