CN101793154A - Method for grouting for stopping up water by using geological parameters of tunnel surrounding rocks and setting relief holes - Google Patents

Abstract

The invention discloses a method for grouting for stopping up water by using geological parameters of tunnel surrounding rocks and setting relief holes, and aims to solve the problems that in case of a strong blast of high-pressure crevice in a long and big rich water tunnel as well as concentrated water quantity and high the water pressure, the conventional grouting technique has the serious grout-leaking phenomenon and unobvious blocking effect. The method comprises the following steps of: 1, drilling the relief holes communicated with crevices at the concentrated water burst positions on the whole rock wall within 1 meters away from the concentrated water burst positions of the rock wall; 2, blocking rock crevices around the crevices at the concentrated water burst positions on the surface of the tunnel; 3, drilling grouting holes communicated with the crevices at the concentrated water burst positions at positions which are 5 to 10 meters away from and on both sides of the concentrated water burst positions; 4, performing radial grouting; 5, pouring the grout in the grouting holes; and 6, pouring the grout in the relief holes. In the method, by using the geological conditions and parameters of the tunnel surrounding rocks and reasonably arranging the relief holes and the grout holes, the problems of grout leakage and the like caused by the high-pressure crevice water are solved, the construction cost is obviously lowered, the construction safety is guaranteed, and the effect of blocking a strong blast of high-pressure crevice water is obvious.

Description

Utilize tunnel surrounding geologic parameter and the grouting water blocking method that tap hole is set

Technical field

The present invention relates to constructing tunnel field in the civil engineering, the grouting water blocking method that is specifically related to utilize the tunnel surrounding geologic parameter He tap hole is set.

Background technology

Extensive expansion along with infrastructure constructions such as present domestic railways, it is imperative to build the tunnel of growing up in karst and complicated geology area, and complex geological condition such as karst water, crevice water, weak surrounding rock etc. have become and influences the subject matter that the constructing tunnel quality safety is faced.

At present, slurry injection technique handle some such as underground structure antiseepage, water blockoff, improve aspect such as tunnel surrounding mechanical property and bringing into play huge effect.But because existing slurry injection technique is only paid attention to injecting paste material and slip casting machinery, make and in the rich water tunnel digging process of growing up, have big strand high pressure crevice water, the water yield is concentrated and hydraulic pressure when big, when utilizing existing cement paste, biliquid to starch radially slurry injection technique, exist race slurry phenomenon serious, the unconspicuous problem of plugging effect can not satisfy the field engineering needs, have a strong impact on the constructing tunnel quality safety, and still do not have a kind of desirable grouting water blocking method at present high pressure crevice water.

Summary of the invention

The present invention is the high pressure crevice water that has big thigh at the rich water tunnel of growing up in order to solve, the water yield is concentrated and hydraulic pressure when big, when utilizing existing slurry injection technique slip casting, exist race slurry phenomenon serious, the unconspicuous problem of plugging effect, and a kind of grouting water blocking method that utilizes the tunnel surrounding geologic parameter and tap hole is set is provided.

The present invention is achieved by the following technical solutions:

Utilize tunnel surrounding geologic parameter and the grouting water blocking method that tap hole is set, may further comprise the steps:

(1) is drilled with tap hole: concentrate near the water burst place 1m to be drilled with the tap hole that communicates with crack, concentrated water burst place on interior complete crag at the tunnel crag;

(2) stop up tunnel surface and concentrate permeable rock crack on every side, crack, water burst place;

(3) be drilled with injected hole: measure the angle of cut α that concentrates crack, water burst place and tunnel wall with circumferentor, be drilled with and the injected hole of concentrating crack, water burst place to communicate in the distance of concentrating the both sides 5～10m of water burst place, the position of injected hole is located at the tap hole below, the spacing of adjacent two injected holes is 1～2m, and satisfy H+L＞S * V

In the formula:

The H-injected hole degree of depth; L-injected hole and crack intersection point arrive the distance of rock layer surface along the crack;

Institute's injection slurry time of setting in the S-injected hole; The V-water velocity;

(4) radially slip casting: anhydrous place carries out radially slip casting (promptly perpendicular to the slip casting of tunnel wall direction) in the injected hole outside 2～3m farthest of water burst place apart from concentrating at the tunnel axial direction, thereby forms water-stop curtain in both sides, crack, concentrated water burst place;

(5) injected hole slip casting: according to injected hole hole depth H, at first the little injected hole of injected hole hole depth H is carried out slip casting, big to the hole depth H of injected hole then injected hole slip casting;

(6) tap hole slip casting: adopt the high-expansion chemical grout to carry out slip casting.

Further, described tap hole diameter is 0.5～0.9m.

Use the fast expansive cement that coagulates during described blocking surface rock crack.

Described injected hole hole depth is 3～5m.

Orifice tube is installed in described injected hole, tap hole aperture, with sealing agent anchoring orifice tube, by-pass valve control is installed in the orifice tube outer end.

Described injected hole slip casting, during tap hole slip casting, grouting pressure=hydraulic pressure+1.5～3mpa.

The present invention makes full use of the geological conditions and the parameter of tunnel surrounding self, reasonable Arrangement tap hole and injected hole, solve because the problems such as race slurry that high pressure crevice water causes can significantly reduce construction cost and guarantee construction safety, blocking high-pressure thigh shape crevice water effect is obvious.

Description of drawings

Fig. 1 arranges schematic diagram for injected hole

Fig. 2 is for being drilled with tap hole and injected hole schematic diagram

Fig. 3 is the little injected hole slip casting schematic diagram of hole depth

Fig. 4 is the big injected hole slip casting schematic diagram of hole depth

Fig. 5 is a tap hole slip casting schematic diagram

Among the figure: 1-concentrates crack, water burst place, 2-tap hole, 3-injected hole, 4-injected hole.

The specific embodiment

Embodiment 1

Utilize tunnel surrounding geologic parameter and the grouting water blocking method that tap hole is set, may further comprise the steps:

(1) is drilled with tap hole: as shown in Figure 2, concentrate near the water burst place 1m to be drilled with the tap hole that communicates with crack, concentrated water burst place on interior complete crag at crag, tap hole is according to water yield size, diameter is that 50mm (also can be 60mm, 90mm), hole depth 3m (also can be 4m, 5m), orifice tube is installed in the tap hole aperture, orifice tube is selected the steel pipe with the tap hole coupling for use, thread is established in the orifice tube outer end, with numb base one of screw thread is tightly wrapped the jail before orifice tube is installed, and with sledgehammer orifice tube is pounded in the borehole wall, adopt sealing agent anchoring orifice tube, by-pass valve control is installed in the outer end;

(2) stop up tunnel surface permeable rock crack: utilize the fast expansive cement that coagulates to stop up and concentrate fracture surface rock crack, water burst place, reduce the water burst area, the thigh water management in tap hole;

(3) be drilled with injected hole: as depicted in figs. 1 and 2, measure the angle of cut α that concentrates crack, water burst place and tunnel with circumferentor, be drilled with and the injected hole of concentrating crack, water burst place to communicate adjacent injected hole spacing 1m in the distance of concentrating the both sides 5～10m of water burst place, and satisfy H+L＞S * V

In the formula:

The H-injected hole degree of depth; L-injected hole and crack intersection point arrive the distance of rock layer surface along the crack;

S-slurries time of setting; The V-water velocity;

Orifice tube is installed in the injected hole aperture, orifice tube is selected the steel pipe with injected hole and tap hole coupling for use, thread is established in the orifice tube outer end, before being installed, orifice tube one of screw thread is tightly wrapped the jail with numb base, with sledgehammer orifice tube is pounded in the borehole wall, adopt sealing agent anchoring orifice tube, by-pass valve control is installed in the outer end;

(4) radially slip casting: (also can be 2.5m, 3m) interior anhydrous place carries out radially slip casting, thereby forms water-stop curtain in both sides, crack, concentrated water burst place apart from concentrating the injected hole outside 2m farthest of water burst place at the tunnel axial direction;

(5) injected hole slip casting: as shown in Figure 3 and Figure 4, according to injected hole hole depth H, at first the little injected hole of injected hole hole depth H is carried out slip casting, big to the hole depth H of injected hole then injected hole slip casting, grouting pressure=hydraulic pressure+1.5～3mpa;

Grouting pipeline and orifice tube are connected, in the slip casting process, open all the other orifice tube ball valves,, when all the other orifice tube pulps, close its ball valve so that observe the slurries spread condition; Beginning slip casting will be used low pressure, then pressurization gradually;

Cement list slurry single hole grouting pressure reaches final pressure, and injection rate is 5L/min, and continuity 20min can finish the slip casting work in this hole;

(6) tap hole slip casting: as shown in Figure 5, adopt the high-expansion chemical grout to carry out slip casting.

Embodiment 2

Mountain, Lvliang City tunnel DK137+100～threaded list road ,+400 left and right sides

Geological condition:

DK137+100～+ 110 places, the rock stratum is more complete, grows a crack of traversing left and right sides line at+110 places, and behind the tunnel excavation, water yield is bigger in the crack.DK137+110～+ 150 places is horizontal stratum, and also there is water outlet in rock stratum bed thickness 0.5～1.0m between bedding; At+150 places, grow fillibility pipe one place, during excavation, a large amount of yellow mud of exposure; DK137+150～200 section are the joint fissure development belt, and country rock is cut into bulk by joint fissure, and underground water is with flowing out between rock; The crack is grown at the DK137+200 place; DK137+200～+ 230 places are for being horizontal stratum, and also there is water outlet in rock stratum bed thickness 0.5～1.0m between bedding.Horizontal crack is grown together by the DK137+230 place, and rock is more complete in DK137+230～+ 250 scopes, DK137+250～+ 400, and per 3～5m is and grows horizontal crack, and water outlet is all arranged in the crack; This section hydraulic pressure is at 0.8mpa.

The water blockoff scheme:

Behind a, the excavation, carry out the setting-out experiment, measure the angle of cut α that concentrates crack, water burst place and tunnel with circumferentor, according to disclosing the country rock situation, in time measure and draw geologic sketch map, crack, strike are measured one by one, analyze the relation that wall-rock crack and bedding and underground water are grown.

B, according to disclosing the country rock situation, in time adjust supporting parameter, DK137+145～+ 205 are section upright establishes the grid steelframe, crack water outlet place in time sets tap hole, concentrates drained.

C, will stop up tunnel surface then and concentrate permeable rock crack around the crack, water burst place;

D, be drilled with injected hole: be drilled with and the injected hole of concentrating crack, water burst place to communicate in the distance of concentrating the both sides 5～10m of water burst place, the position of injected hole is located at the tap hole below, and the spacing of adjacent two injected holes is 1m, and satisfies H+L＞S * V,

In the formula:

The H-injected hole degree of depth; L-injected hole and crack intersection point arrive the distance of rock layer surface along the crack;

Institute's injection slurry time of setting in the S-injected hole; The V-water velocity;

E, water blockoff is carried out as a water blockoff paragraph in DK137+100～+ 250, the water blockoff job placement is after the inverted arch construction.

F, this section are carried out water blockoff by two ends to the centre, upwards carry out water blockoff from inverted arch, and right line carries out water blockoff behind the left line earlier.

G, at first take burst shape water burst improvement method to carry out DK137+100～+ 150, DK137+200～+ 250 section horizontal bedding and the laterally water outlet in crack.Using material mainly is to adopt high-expansion chemical grout, chemical grout, fast setting cement to carry out shutoff;

H, then the radially grouting degree of depth 5～10m (going deep into whole rock stratum 1.5m) of full tunnel section is carried out in DK137+140～+ 150, DK137+200～+ 210 two.Two sections at this paragraph form seal ring, there being the water location to control between them, and the phenomenon of string water before and after also reducing.

I, radially slip casting section is carried out in DK137+150～+ 200, injecting paste material is chosen chemical grout earlier, and pressure injection cement-water glass biliquid slurry replenishes the pressure injection cement grout at last then.Grouting sequence is inverted arch-abutment wall-arch.

Carry out right line slip casting after j, the slip casting of left line water blockoff are finished, grouting method is consistent with right line.

K, adopt the high-expansion chemical grout to carry out slip casting tap hole.

Water plugging effect:

After this section taked this scheme to finish, water plugging effect had reached designing requirement.In the water blockoff process, string regimen condition (when blocking up right line, new EXIT POINT appears in left line RightWall) appears in left and right sides line two places, and string water appears in front and back, and new EXIT POINT appears in two rimalas in DK137+080 place, carries out the slip casting shutoff after the discovery, and plugging effect is good.

Claims (6)

1. one kind is utilized tunnel surrounding geologic parameter and the grouting water blocking method that tap hole is set, and it is characterized in that may further comprise the steps:

(1) is drilled with tap hole: concentrate near the water burst place 1m to be drilled with the tap hole that communicates with crack, concentrated water burst place on interior complete crag at the tunnel crag;

(2) stop up tunnel surface and concentrate permeable rock crack on every side, crack, water burst place;

(3) be drilled with injected hole: measure the angle of cut α that concentrates crack, water burst place and tunnel wall with circumferentor, be drilled with and the injected hole of concentrating crack, water burst place to communicate in the distance of concentrating the both sides 5～10m of water burst place, the position of injected hole is located at the tap hole below, the spacing of adjacent two injected holes is 1～2m, and satisfy H+L＞S * V

In the formula:

The H-injected hole degree of depth; L-injected hole and crack intersection point arrive the distance of rock layer surface along the crack;

Institute's injection slurry time of setting in the S-injected hole; The V-water velocity;

(4) radially slip casting: anhydrous place carries out radially slip casting in the injected hole outside 2～3m farthest of water burst place apart from concentrating at the tunnel axial direction, thereby forms water-stop curtain in both sides, crack, concentrated water burst place;

(5) injected hole slip casting: according to injected hole hole depth H, at first the little injected hole of injected hole hole depth H is carried out slip casting, big to the hole depth H of injected hole then injected hole slip casting;

(6) tap hole slip casting: adopt the high-expansion chemical grout to carry out slip casting.

2. according to the described grouting water blocking method that utilizes the tunnel surrounding geologic parameter and tap hole is set of claim 1, it is characterized in that described tap hole aperture is 0.5～0.9m.

3. according to claim 1 or the 2 described grouting water blocking methods that utilize the tunnel surrounding geologic parameter and tap hole is set, use the fast expansive cement that coagulates when it is characterized in that blocking surface rock crack.

4. according to claim 1 or the 2 described grouting water blocking methods that utilize the tunnel surrounding geologic parameter and tap hole is set, it is characterized in that described injected hole hole depth is 3～5m.

5. according to claim 1 or the 2 described grouting water blocking methods that utilize the tunnel surrounding geologic parameter and tap hole is set, it is characterized in that step (5) and step (6) are when slip casting, orifice tube is installed in injected hole, tap hole aperture, with sealing agent anchoring orifice tube, by-pass valve control is installed in the orifice tube outer end.

6. according to claim 1 or the 2 described grouting water blocking methods that utilize the tunnel surrounding geologic parameter and tap hole is set, it is characterized in that step (5) and step (6) when slip casting, grouting pressure=hydraulic pressure+1.5～3mpa.

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