CN203643304U - A test device for studying seepage deformation under the condition of changing seepage flow velocity along the course - Google Patents

Abstract

The utility model discloses a testing device for researching seepage deformation under a condition of variation of on-way seepage flow velocity. A cover plate is arranged on the top of a seepage tank and is in sealed connection with the seepage tank; the seepage tank comprises a water filling area, a sample area and a drain area, which are arranged in sequence; a constant water head device is connected with the water filling area through a water tube; a sand isolating net is arranged inside the seepage tank; the water filling area, the sample area and the drain area are partitioned through the sand isolating net; a test sample is positioned inside the test sample area; at least one pressure sensor s arranged inside the test sample area; the pressure sensor is connected with a data receiving processor through a lead; the transverse cross section of the seepage tank is trapezoid; the water filling area is positioned on one side with larger area inside the seepage tank; the drain area is positioned on one side with smaller area inside the seepage tank; the drain area is provided with a drain hole. The testing device is simple in structure, easy to operate, and scientific and reasonable in structural design, and the regulation of soil body seepage deformation and damage under the condition of variation of on-way seepage flow velocity can be simulated.

Description

A kind of research is along the test unit of seepage deformation under journey seepage velocity situation of change

Technical field

The utility model relates to a kind of test unit of studying ordinary water seepage deformation.Belong to Geotechnical Engineering experimental test field.

Background technology

Dykes and dams seepage failure is to cause security incident or one of the principal mode that breaks down, and therefore the research of the seepage deformation problem of dykes and dams is significant.Because the head boundary of arc dyke is arc, near making, the seepage direction on stratum forms the state that converges or spread, and will change along journey seepage velocity.Device of the present utility model is exactly to study thisly along soil body penetration deformation rule under journey seepage velocity situation of change, provides reference for dyke designs or reinforces.

Accompanying drawing 1 is constant head permeability apparatus in priorart.In accompanying drawing 1, Reference numeral title is as follows: 1, metallic cylinder; 2, metal perforated plate; 3, pressure tap; 4, piezometric tube; 5, spillway hole; 6, water seepage hole; 7, adjustable pipe; 8, travelling carriage; 9, feed pipe; 10; Tongs; 11, thermometer; 12, gravel bed; 13, sample; 14, measuring cup; 15, water supply bottle.Seepage deformation research device of the prior art is mostly regular square groove or cylindrical, when seepage failure, seepage velocity is uniform, do not consider along the situation of journey change in flow, head control device can not maintain it and stablize for a long time, data observation is generally taked more coarse piezometric tube manual record data, the seepage failure under unsteady flow speed can not be reflected, the osmotic stability problem of arc dyke levee foundation can not be truly reflected.Therefore need a kind of improved technical scheme to overcome the above problems.

Utility model content

For solving above technical matters, the utility model provides the test unit of a kind of research along seepage deformation under journey seepage velocity situation of change, comprise constant water head unit, water pipe, permeable tank, every sand net, cover plate, sample, pressure transducer, wire and data receiving processor, cover plate is arranged on the top of permeable tank and is tightly connected with permeable tank, permeable tank is divided into water filling district, sample area and drained zone, water filling district, sample area, drained zone is arranged in order, constant water head unit is connected by water pipe with water filling district, be positioned in permeable tank every sand net, water filling district, drained zone and sample area are by separating every sand net, sample is positioned at sample area, in sample area, be at least provided with a pressure transducer, pressure transducer is connected with data receiving processor by wire, the lateral cross section of permeable tank is trapezoidal, water filling district is positioned at the side that permeable tank inner volume is larger, drained zone is positioned at the side that permeable tank inner volume is less, drained zone is provided with osculum.

Preferably: constant water head unit is made up of the first cylindrical shell and the second cylindrical shell, and the first cylindrical shell is arranged in the second cylindrical shell, water pipe is connected with the bottom of the first cylindrical shell cylinder.

Preferably: the first cylindrical shell is cylindrical drum, the second cylindrical shell is square tube.

Preferably: multiple pressure transducers are distributed on sample area along permeable tank length direction, between pressure transducer, be spaced apart 10cm.

Preferably: permeable tank adopts organic glass to make.

Preferably: water filling is provided with vent port in district.

Beneficial effect: this apparatus structure design science is reasonable, can simulate along the rule of soil body penetration deformation and failure under journey seepage velocity situation of change, analyzes tool be of great significance for the osmotic stability of arc dyke levee foundation.With respect to other head control device, constant water head unit of the present utility model is simple in structure, processing ease, and it is stable under less quality, to maintain head.

Accompanying drawing explanation

Fig. 1 is test unit of the prior art.

Fig. 2 is test unit structural drawing of the present utility model.

Fig. 3 is the planimetric map of permeable tank.

Fig. 4 is the planimetric map of constant water head unit.

Reference numeral title is as follows:

1, constant water head unit; 2, water pipe; 3, permeable tank; 4, every sand net; 5, osculum; 6, cover plate; 7, vent port; 8, pressure transducer; 9, wire; 10, data receiving processor; 11, water filling district; 12, sample area; 13, drained zone; 14, overflow vent; 15, the first cylindrical shell; 16, the second cylindrical shell.

Embodiment

A kind of research is along the test unit of seepage deformation under journey seepage velocity situation of change, research is along the test unit of seepage deformation under journey seepage velocity situation of change, comprises constantwater head unit 1,water pipe 2,permeable tank 3, every sand net 4, sample,cover plate 6,vent port 7,pressure transducer 8,wire 9 anddata receiving processor 10.

Permeable tank 3 all around and bottom all have plate, only have top there is no plate.The top ofpermeable tank 3 is provided withcover plate 6,cover plate 6 can be started, and sample is put intopermeable tank 3 easily.Sample,pressure transducer 8 and a part of wire are being put into afterpermeable tank 3,cover plate 6 is covered at the top ofpermeable tank 3, andcover plate 6 andpermeable tank 3 are tightly connected.Permeable tank 3 is divided intowater filling district 11,sample area 12 and drainedzone 13, andwater filling district 11,sample area 12, drainedzone 13 are arranged in order.In sand net 4 is positioned overpermeable tank 3,vent port 7 is arranged in water filling district 11.Owing to putting into after sample inpermeable tank 3, andcover plate 6 is tightly connected withpermeable tank 3, and makingwater filling district 11 is a seal cavity, and the effect ofvent port 7 is to make water can enter smoothly in water filling district 11.Water filling district 11, drainedzone 13 are withsample area 12 by separating every sand net 4, and sample is positioned at sample area 12.In sample area, be at least provided with apressure transducer 8,pressure transducer 8 is connected withdata receiving processor 10 by wire 9.Multiple pressure transducers 8 are distributed onsample area 12 alongpermeable tank 3 length directions, betweenpressure transducer 8, are spaced apart10cm.Pressure transducer 8 gaging pressure accurately, can be recorded in real time at the pressure changing in sample under different constant heads simultaneously.Permeable tank 3 adopts organic glass to make, and can be clearly seen that the situation ofpermeable tank 3 inside.

The lateral cross section ofpermeable tank 3 is trapezoidal,water filling district 11 is positioned at the side thatpermeable tank 3 inner volumes are larger (near a trapezoidal side of going to the bottom), drainedzone 13 is positioned at the side thatpermeable tank 3 inner volumes are less (near a side of trapezoidal upper base), inpermeable tank 3, from progressively diminishing to the vertical cross-section of a side (right side in Fig. 2)permeable tank 3 near trapezoidal upper base near a trapezoidal side of going to the bottom (left side Fig. 2).Drainedzone 13 has osculum 5.The cross section ofpermeable tank 3 changes, and the cross section of otherpermeable tank 3 is constant in the prior art, and the variation that current will produce flow velocity during bypermeable tank 3 is convenient to research along seepage deformation rule in journey change in flow situation.

Constantwater head unit 1 is made up of the firstcylindrical shell 15 and the second cylindrical shell 16.At the bottom of the firstcylindrical shell 15 is arranged in the secondcylindrical shell 16, the firstcylindrical shells 15 and the secondcylindrical shell 16 and all has a tin and side, the top of the firstcylindrical shell 15 and the secondcylindrical shell 16 is opening, the firstcylindrical shell 15 and the secondcylindrical shell 16 share a bottom surface.One end ofwater pipe 2 is connected with the cylinder bottom of the first cylindrical shell 15.The other end ofwater pipe 2 is connected with thewater filling district 11 of permeable tank 3.Water level is in the firstcylindrical shell 15, and the bottom surface of the secondcylindrical shell 16 hasoverflow vent 14 on (not shared with the firstcylindrical shell 15 bottom surface).The height of the secondcylindrical shell 16 is greater than the height of the first cylindrical shell 15.In the time doing experiment, water is ceaselessly flowed in the firstcylindrical shell 15, and make the water flowing in the firstcylindrical shell 15 in the unit interval exceed the water flowing out fromwater pipe 2 in the unit interval, so in the time that the water injecting exceeds the height of the firstcylindrical shell 15, water overflows and flows in the secondcylindrical shell 16 from the firstcylindrical shell 15, thereby makes the water in the firstcylindrical shell 15 keep constant water head status.The unnecessary water flowing in the secondcylindrical shell 16 flows out from theoverflow vent 14 of the secondcylindrical shell 16 bottoms.In the utility model, the firstcylindrical shell 15 adopts cylindrical drum, and the secondcylindrical shell 16 adopts square tube.That is to say and make the water yield that enters cylindrical drum more than the water yield of overflowing, cylindrical drum has water to overflow all the time, keeps the interior water level of cylindrical drum constant, and sample permeates under constant head.With respect to other head control device, this apparatus structure is simple, processing ease, and it is stable under less quality, to maintain head.

Principle of work: by commonpermeable tank 3 devices are transformed, become thepermeable tank 3 of variable cross section, when water circulates in groove, due to the variation in cross section, flow velocity also will change, use this characteristic studying along seepage deformation in journey change in flow situation the cohesiveless soil of different gradation, research and analyse and finally obtain cohesiveless soil along journey change in flow situation lower critical water conservancy gradient and seepage deformation rule by Data Comparison.

Claims (6)

1. a research is along the test unit of seepage deformation under journey seepage velocity situation of change, it is characterized in that: comprise constant water head unit (1), water pipe (2), permeable tank (3), every sand net (4), cover plate (6), sample, pressure transducer (8), wire (9) and data receiving processor (10), cover plate (6) is arranged on the top of permeable tank (3) and is tightly connected with permeable tank (3), permeable tank (3) is divided into water filling district (11), sample area (12) and drained zone (13), water filling district (11), sample area (12), drained zone (13) is arranged in order, constant water head unit (1) is connected by water pipe (2) with water filling district (11), in sand net (4) is positioned over permeable tank (3), water filling district (11), drained zone (13) and sample area (12) are by separating every sand net (4), sample is positioned at sample area (12), in sample area, be at least provided with a pressure transducer (8), pressure transducer (8) is connected with data receiving processor (10) by wire (9), the lateral cross section of permeable tank (3) is trapezoidal, water filling district (11) is positioned at the larger side of permeable tank (3) inner volume, drained zone (13) is positioned at the less side of permeable tank (3) inner volume, drained zone (13) is provided with osculum (5).

2. test unit according to claim 1, it is characterized in that: constant water head unit (1) is made up of the first cylindrical shell (15) and the second cylindrical shell (16), the first cylindrical shell (15) is arranged in the second cylindrical shell (16), and water pipe (2) is connected with the bottom of the first cylindrical shell cylinder (15).

3. test unit according to claim 2, is characterized in that: the first cylindrical shell (15) is cylindrical drum, and the second cylindrical shell (16) is square tube.

4. test unit according to claim 1, is characterized in that: multiple pressure transducers (8) are distributed on sample area (12) along permeable tank (3) length direction, between pressure transducer (8), is spaced apart 10cm.

5. test unit according to claim 1, is characterized in that: permeable tank (3) adopts organic glass to make.

6. test unit according to claim 1, is characterized in that: also comprise vent port (7), vent port (7) is arranged in water filling district (11).

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