CN214221187U

CN214221187U - Water-rich stratum structure with upper soft part and lower hard part

Info

Publication number: CN214221187U
Application number: CN202120010058.XU
Authority: CN
Inventors: 杨陈相; 孟小伟; 赵平; 高骏; 陈歆; 夏靖; 孙庆洁; 张椿民; 董晓彪; 蒋强福
Original assignee: CREEC Kunming Survey Design and Research Co Ltd
Current assignee: CREEC Kunming Survey Design and Research Co Ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-09-17
Anticipated expiration: 2031-01-05

Abstract

The utility model discloses a go up soft hard rich water stratum structure down, this structure includes the diaphragm wall, the diaphragm wall includes horizontal diaphragm wall and vertical diaphragm wall, horizontal diaphragm wall and vertical diaphragm wall divide the storehouse on will going up soft hard rich water stratum plane down, horizontal diaphragm wall is apart from just propping up an outline certain distance, vertical diaphragm wall gets into waterproof well slightly weathering rock stratum and cuts off groundwater, the diaphragm wall divides the storehouse to enclose and closes and sets up a plurality of precipitation wells in the within range, continuous precipitation is carried out in the under-deck after the diaphragm wall construction is sealed, carry out the slip casting after the diaphragm wall divides the storehouse precipitation and consolidates and form the slip casting layer. The utility model discloses can realize cutting water, precipitation, reinforcement and mine method tunnel excavation in limited within range, reduce the influence to all ring edge borders, effectively solve soft lower hard rich water stratum and bury the structure deeply and open cut the difficult problem that the method excavation depth is big, the cost is high, the risk is high, and obtain successful application in actual engineering.

Description

Water-rich stratum structure with upper soft part and lower hard part

Technical Field

The utility model belongs to tunnel construction field is a go up hard rich water stratum structure down particularly.

Background

At present, the tunnel engineering mainly comprises the following schemes aiming at designing construction measures for water-rich strata with soft upper parts and hard lower parts:

according to the first scheme, ground precipitation is adopted, and grouting is carried out on a curtain in a tunnel;

scheme two, mainly draining, pumping and draining combined water in the tunnel;

thirdly, arranging a precipitation guide hole or a drainage ditch in the water collection direction for drainage;

and a scheme of combining ground precipitation and precipitation in the tunnel is adopted.

The above schemes have practical cases in practical engineering, but have disadvantages:

for stratums with high water permeability such as pebbles and the like, sufficient water supply is provided, and confined water is often contained. A water interception curtain is not arranged on the ground or in the hole for water lowering and draining, water is continuously supplied, the water pumping amount is large, the water level lowering depth is small, and the expected water lowering effect cannot be achieved. In addition, a large amount of precipitation can cause the surrounding stratum to settle, and the surrounding environment is greatly influenced.

And secondly, aiming at the upper soft and lower hard stratum, the lower rock body needs to be blasted, the blasting can cause disturbance to the upper soft soil body, and water leakage can be formed under the water-rich state to cause surging and collapse. Even if the hole is grouted by adopting the advanced curtain, the diffusion resistance of the grout is larger in the water-rich state, the grout is lost, and the grouting reinforcement water stop effect is not ideal.

To sum up, there are precipitation difficulty, the slip casting effect is not good, the big problem of excavation risk in current soft bottom hard rich water stratum tunnel design construction measure. Therefore, research on the design and construction scheme of the mining method for the water-rich stratum with the upper soft and the lower hard which can effectively solve the problems is urgently needed.

Disclosure of Invention

In order to solve the problem, the utility model provides a go up soft rich water stratum structure of hard down.

The technical scheme of the utility model is specifically as follows:

the utility model provides a go up soft hard rich water stratum structure down, including the continuous wall, the continuous wall includes horizontal continuous wall and vertical continuous wall, horizontal continuous wall and vertical continuous wall divide the storehouse on the soft rich water stratum plane of hard down, horizontal continuous wall is apart a certain distance from the first outline that props up, vertical continuous wall gets into impervious middle and slightly weathered rock stratum and cuts off groundwater, set up a plurality of precipitation wells in the continuous wall divides the storehouse confined scope, continuous precipitation in the cabin after the continuous wall construction is sealed, carry out the slip casting after the continuous wall divides the storehouse precipitation and consolidate and form the slip casting layer.

Further, the grouting layer is arranged between the continuous wall waterproof curtains.

Furthermore, the longitudinal length of the continuous wall is 40-50 m, and the distance between the transverse continuous wall and the outer contour of the primary support is 3-4 m.

Further, the vertical continuous wall enters the impervious middle slightly weathered rock stratum for 1-2 m to block underground water.

Furthermore, the dewatering well goes deep into the impervious bed for 2-4 m, and the water level in the cabin is monitored and early warned in the whole process through the dewatering well.

The utility model discloses a divide the storehouse on the continuous wall (structure arrangement of reinforcement) will be soft down hard rich water stratum plane, and vertical continuous wall gets into waterproof middle and little weathering rock stratum, cuts off groundwater. The in-cabin precipitation well not only can realize that precipitation improves the reinforced effect of slip casting in the diaphragm wall closed bin, can realize anhydrous operation at the very big reduction excavation risk of excavation in-process precipitation moreover, can also be simultaneously water level observation well, observes the early warning to the under-cabin water level. Grouting reinforcement is carried out to compact and fill the pebble layer, the performance of the pebble layer of the arch part at the periphery of the tunnel is improved, and the risk of arch part collapse of blasting excavation of the lower step is reduced.

Compared with the prior art, the utility model has the advantages of as follows:

(1) the utility model discloses a diaphragm wall (structure arrangement of reinforcement) divides the storehouse to intercept water, blocks water source supply and slip casting thick liquid and runs off, has greatly reduced the volume of drawing water, improves the slip casting effect, realizes anhydrous work, reduces excavation safety risk. In addition, the continuous wall can not only play a role in intercepting water, but also play a role in partially isolating the piles, and reduce the influence on the surrounding environment.

(2) The utility model discloses divide the storehouse at the diaphragm wall to enclose at the within range precipitation of closing, can precipitation as required, according to the excavation progress, consolidate according to storehouse precipitation and slip casting, reduce the cost of continuation precipitation on a large scale. In addition, the dewatering well is also used as a water level observation well, and the water level in the cabin is monitored and early warned in the whole process in the construction process.

(3) The utility model discloses the diaphragm wall divides the storehouse to enclose and carries out the slip casting after closing precipitation, reduces the loss of thick liquid, and waterless operation improves the convenience of slip casting and effect, has practiced thrift engineering cost.

(4) The utility model discloses can realize cutting water, precipitation, reinforcement and mine method tunnel excavation in limited within range, reduce the influence to all ring edge borders, effectively solve soft lower hard rich water stratum and bury the structure deeply and open cut the difficult problem that the method excavation depth is big, the cost is high, the risk is high, and obtain successful application in actual engineering.

Drawings

The accompanying drawings are added to provide a clear, more detailed, and more detailed description of the basic contents, basic features, and basic connotations of the present invention.

FIG. 1 is a schematic plan view of a continuous wall separated water intercepting and dewatering well;

FIG. 2 is a schematic cross-sectional view of a typical design construction scenario;

FIG. 3 is a schematic cross-sectional view of a diaphragm wall construction;

FIG. 4 is a schematic cross-sectional view of dewatering well construction;

FIG. 5 is a schematic cross-sectional view of a grouting reinforcement;

fig. 6 is a schematic sectional view of tunnel excavation.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments belong to the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.

As shown in fig. 1-6, the existing ground is sequentially a clay layer containing organic powder, a pebble soil layer and a medium and slightly weathered layer from top to bottom.

As shown in fig. 1 and 2, the water-rich stratum structure with soft top and hard bottom of the embodiment includes continuous walls, the interval tunnel 4 is arranged between the continuous walls, the continuous walls include transverse continuous walls 2 and vertical continuous walls 1, the transverse continuous walls 2 and the vertical continuous walls 1 divide the plane of the water-rich stratum with soft top and hard bottom into bins, the transverse continuous walls have a certain distance from the outline of the primary support, the vertical continuous walls 1 enter the impervious middle-weathered rock to block the groundwater, a plurality of precipitation wells 3 are arranged in the enclosed range of the divided bins of the continuous walls, the continuous walls continue to reduce the water in the compartments after being constructed and enclosed, and the continuous walls are grouted and reinforced to form a grouting layer 5 after being divided bins reduced the water. The grouting layer 5 is arranged between the continuous wall waterproof curtains 1.1.

In the implementation, the continuous wall (structural reinforcement) divides the upper soft and the lower hard water-rich stratum plane into two bins, the longitudinal (vertical) bin is 40-50 m generally, the distance between the transverse continuous wall and the outer contour of the primary support is 3-4 m generally, and the primary support radial anchor rod and other support systems are prevented from penetrating through the continuous wall.

The vertical continuous wall 1 enters the impervious moderately weathered rock stratum for 1-2 m to block underground water. The continuous wall can not only play a role in intercepting water, but also play a role in partially isolating the piles, and reduce the influence on the surrounding environment.

A certain number of dewatering wells 3 are arranged in the enclosed range of the partition wall, and the dewatering wells 3 are required to be deep into the impervious bed for 2-4 m. Continuous precipitation is carried out in the cabin after the diaphragm wall construction is closed, so that waterless operation in the cabin is realized, the grouting quality is improved, and the excavation risk is reduced. The dewatering well 3 can be used as a water level observation well to monitor and early warn the water level in the cabin in the whole process.

Grouting reinforcement is carried out after precipitation of the diaphragm wall in separate bins, and common grout comprises cement paste and double-grout. The diaphragm wall divides the storehouse to cut can effectively avoid the loss of thick liquid, improves the thick liquid utilization ratio, and the slip casting after the precipitation reduces slip casting pressure and resistance, improves thick liquid diffusion radius and filling rate. Grouting reinforcement after separate precipitation greatly improves grouting effect, strengthens grouting arch ring effect, reduces the risk that the arch part of lower bench blasting excavation collapses.

The construction method of the water-rich stratum structure with the soft upper part and the hard lower part is carried out as follows:

engineering hydrogeology reconnaissance is carried out before construction, hydrogeology conditions of a field are known, investigation is carried out on the field and surrounding environment, whether important pipelines exist or not is verified, and the pipelines are required to be moved out of the range of the continuous wall.

As shown in figure 3, the continuous wall is constructed in different bins, the continuous wall is preferably constructed by a groove jumping method, and the joints are I-shaped steel rigid joints. The upper soil layer adopts grab bucket grooving and the lower rock layer adopts impact grooving in the continuous wall grooving mode. The thickness of the continuous wall can be determined according to the depth of the continuous wall, and the thickness of 600 mm and 800mm is preferably adopted. The depth of the continuous wall penetrating into the moderately weathered and slightly weathered rock is 1-1.5 m, and the continuous wall is ensured to enter a watertight layer to block groundwater replenishment.

As shown in figure 4, after the continuous wall is enclosed, a precipitation well is arranged on the ground for ground precipitation. The dewatering well is driven into weathered and slightly weathered rocks with the depth of 2-4 m, and can collect diving water above a soil-rock junction surface. Precipitation should be continued until the pumping volume and the groundwater level tend to be stable. And (4) after the precipitation is finished, the precipitation well is not closed and is also used as a water level observation well in the tunnel excavation process, and if the water level is higher, the precipitation is carried out, so that the waterless operation is ensured.

As shown in figure 5, grouting reinforcement is carried out after precipitation is finished, ground grouting or in-tunnel grouting can be adopted for grouting, and ground grouting is preferably adopted when the buried depth of the tunnel is shallow. The outer side of the grouting range is preferably 3-8 m outside the outer contour of the primary support of the tunnel, the grouting range is determined according to the size of the tunnel excavation contour, and the inner side of the grouting range is preferably 1m into the rock stratum. As the diaphragm wall is adopted for enclosing, the grout can not be lost, so that the grouting material is preferably single-fluid grout.

As shown in fig. 6, after the grouting reaches the design requirement, the advanced tunnel support can be implemented, the tunnel can be excavated step by step, and the primary support can be implemented in time.

The above-mentioned example is only an example of the application of the present invention, and does not limit the scope of the application of the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention all belong to the protection scope of the present invention.

Claims

1. The utility model provides a water-rich stratum structure of hard under soft which characterized in that: the continuous wall comprises a transverse continuous wall and a vertical continuous wall, wherein the transverse continuous wall and the vertical continuous wall divide a soft upper layer and a hard lower layer on a water-rich stratum plane, the transverse continuous wall has a certain distance from an outer contour of a primary support, the vertical continuous wall enters a waterproof middle and slightly weathered rock stratum to separate underground water, a plurality of precipitation wells are arranged in a compartment-divided enclosed range of the continuous wall, continuous precipitation is carried out in the compartment after the continuous wall is constructed and enclosed, and grouting reinforcement is carried out after the continuous wall is divided into compartments to reduce the precipitation to form a grouting layer.

2. The water-rich subterranean formation structure of claim 1, wherein: the grouting layer is arranged between the continuous wall waterproof curtains.

3. The water-rich subterranean formation structure of claim 1, wherein: the longitudinal length of the continuous wall is 40-50 m, and the distance between the transverse continuous wall and the outer contour of the primary support is 3-4 m.

4. The water-rich subterranean formation structure of claim 1, wherein: the vertical continuous wall enters the impervious moderately weathered rock stratum for 1-2 m to block underground water.

5. The water-rich subterranean formation structure of claim 1, wherein: the dewatering well goes deep into the impervious bed for 2-4 m, and the water level in the cabin is monitored and early warned in the whole process through the dewatering well.