CN112796295A

CN112796295A - Method for extruding compact rock-soil body through soybean capsule air inflation

Info

Publication number: CN112796295A
Application number: CN202110020117.6A
Authority: CN
Inventors: 仇安兵
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2021-05-14
Anticipated expiration: 2041-01-07
Also published as: CN112796295B

Abstract

The invention relates to the technical field of soil body treatment, and provides a method for extruding a compact rock-soil body by soybean capsule ballooning, wherein mature soybeans are placed in rubber capsules, water and a proper amount of bifidobacteria are added, and then the rubber capsules are sealed; placing the sealed rubber capsules in loose soil or rock-soil body drill holes with cracks arranged according to a set rule, and then backfilling the drill holes; the rubber capsule is continuously expanded by the water absorption and expansion action of the soybeans and the gas generated in the water absorption and expansion process of the soybeans to extrude the surrounding soil body, so that the cracks in the soil body are closed, and the soil body is dense. The method is particularly suitable for emergency treatment of soil body water leakage, can be popularized and applied to other projects needing soil body compaction, is simple and effective, has low cost and extremely high popularization value.

Description

Method for extruding compact rock-soil body through soybean capsule air inflation

Technical Field

The invention relates to the technical field of soil body treatment, in particular to a method for extruding a compact rock-soil body by soybean capsule air inflation, which is particularly suitable for emergency treatment of soil body leakage water.

Background

Soil loosening can cause very adverse effects on underground engineering and building foundation construction. Before construction operation, loose soil layers need to be densely processed. The common soil body compacting method in engineering mainly comprises vibrating compacting and compacting. The method adopts methods of blasting, tamping, extruding, vibrating and the like to compact the soil body, and the method can improve the shear strength of the soil body to a certain extent. However, the method has very obvious limitations, the existing vibration compaction and compaction methods cause serious damage to the original structure of the soil body, the original stress balance in the soil body is broken, repeated surface compaction is needed, and the integral strength of the soil body is improved. The method has complicated working procedures, is only suitable for the surface loose soil body, and has no effective solution to compaction measures for the underground deep loose rock-soil layer.

Disclosure of Invention

The invention provides a method for extruding a dense rock-soil body by soybean capsule air inflation, aiming at the problem that the existing engineering technology can not extrude and densify underground deep rock-soil layers, and the method utilizes the water absorption and expansion of soybeans and the expansion action of bifidobacterium decomposing oligosaccharide to release a large amount of gas to close cracks in the rock-soil body and densify the soil body.

The invention adopts the following technical scheme:

a method for pressing compact rock-soil body by soybean capsule air inflation, wherein mature soybean is placed in a rubber capsule, water and a proper amount of bifidobacteria are added, and then the rubber capsule is sealed; placing the sealed rubber capsules in loose soil bodies or rock-soil body drill holes with cracks which are arranged according to a set rule; the rubber capsule is continuously expanded by the water absorption and expansion action of the soybeans and the gas generated in the water absorption and expansion process of the soybeans to extrude the surrounding soil body, so that the cracks in the soil body are closed, and the soil body is dense.

Furthermore, the rubber capsule can adopt various rubbers, preferably butadiene rubber, and the butadiene rubber has the advantages of good elasticity, aging resistance, corrosion resistance and the like.

Further, the size of the rubber capsule is determined through experiments according to the height of a soil body to be compacted, the depth of a drill hole and the distance between the drill holes; the rubber capsule is closely arranged in the drill hole.

Furthermore, the diameter of the rubber capsule is the same as or slightly smaller than the diameter of the drilled hole, and the length of the rubber capsule is 3m-5 m. According to the actual conditions of engineering, one rubber capsule can be placed in one drilling hole, and a plurality of rubber capsules can also be placed in the drilling hole.

Further, for the punctiform leaking water soil body, drilling holes at the leaking points, wherein the drilling holes are from the depth to the leaking point and penetrate through the leaking point for a distance h1, the diameter of the drilling holes is 75mm-150mm, and the rubber capsules injected into the soybeans after sealing are stacked from the bottoms of the drilling holes to a distance h2 higher than the leaking point.

Furthermore, h1 is 0.8-1.2m, and h2 is 1.2-1.8 m.

Further, for the multi-point leakage water soil body, holes are drilled from the inside to the outside in sequence from the leakage center according to the positions of the leakage points, and the sealing rubber capsules are respectively placed.

Further, for the planar leakage water, drilling holes on the leakage surface, wherein the drilling depth is up to the position of the leakage surface and penetrates through the leakage surface for a distance h3, the drilling distance is 0.5-1 m, the drilling diameter is 75-150 mm, and the rubber capsules injected into the soybean seal are stacked from the bottom of the drilling holes to a distance h4 higher than the leakage surface.

Further, h3 is 1.5-2.5m, and h4 is 1.5-2.5 m; and simultaneously injecting the sealed rubber capsules into a plurality of drilled holes.

Further, the ratio of soybean, water and bifidobacteria in the sealed capsule is preferably 100:20: 5. Other ratios may also be used depending on experimental results.

Furthermore, the optimal growth temperature of the bifidobacteria is 37-41 ℃, and the minimum growth temperature is 25-28 ℃.

The invention has the beneficial effects that: the soybean is utilized to generate an imbibition effect in water, the volume is increased, a certain swelling effect is generated on the coat of the rubber capsule, in addition, bifidobacterium contained in the water decomposes oligosaccharide contained in the soybean, a large amount of gases such as CO2, NH3 and the like are released, the volume of the capsule is continuously expanded and increased, the surrounding loose soil body is extruded, the crack in the soil is closed, and the soil body is dense. The effect of compacting and loosening rock-soil bodies is achieved; the method is simple and effective, has low cost and extremely high popularization value.

Drawings

Fig. 1 is a schematic view of an application scenario of a method for extruding a dense rock-soil body by soybean capsule ballooning in an embodiment of the invention (soybean is not expanded in rubber capsule).

Figure 2 is a schematic representation of soybeans after swelling in rubber capsules.

In the figure, 1-crack; 2-soybean; 3-water (containing appropriate amount of bifidobacteria); 4-rubber capsules; and 5, drilling.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects.

As shown in fig. 1, in the embodiment of the invention, a method for pressing a dense rock-soil body by soybean capsule ballooning comprises the steps of placing mature high-quality soybeans in rubber capsules, adding water and a proper amount of bifidobacteria, and sealing the rubber capsules; placing the sealed rubber capsules in loose soil bodies or rock-soil body drill holes with cracks which are arranged according to a set rule; the rubber capsule is continuously expanded by the water absorption and expansion action of the soybeans and the gas generated in the water absorption and expansion process of the soybeans to extrude the surrounding soil body, so that the cracks in the soil body are closed, and the soil body is dense.

In one embodiment, the rubber capsule is made of butadiene rubber which is good in elasticity and toughness, ageing-resistant, and acid-base resistant.

In the shallow soil layer, warm water with the temperature suitable for the growth of bifidobacteria is preferably injected into the rubber capsule, and the temperature of the warm water is 37-41 ℃; in the stratum with deeper soil layer, the temperature of the soil layer is higher, the growth of bifidobacterium is more suitable, and warm water is not needed. The stronger the activity of the bifidobacterium is, the more obvious the catalytic action on the soybean is, and the more obvious the extrusion compaction effect on the soil body is.

FIG. 2 is a schematic diagram of the soybean capsule after ballooning and squeezing. The soybeans are always soaked in water in the capsule, water molecules enter the soybean structural gel through the capillary action, the hydrophilic colloid absorbs water and expands to generate an imbibition phenomenon, the soybean volume expands, and the expansion coefficient is about 1.8-2.4 generally. The soybean contains rich oligosaccharide, under the action of bifidobacterium, the oligosaccharide is decomposed to generate a large amount of CO2 and NH3 which are filled in a sealed rubber capsule, and a huge thrust effect is generated on soil bodies on two sides, so that cracks contained in loose soil bodies are gradually closed.

Practical applications of the process of the invention are illustrated by the following specific examples.

In one embodiment, the soil is subject to point-like leakage. And drilling the leakage point, wherein the drilling depth is preferably up to the leakage point and penetrates through the leakage point by 1m, the diameter of the drilling hole is 75-150 mm, the soybean is injected from the bottom of the hole to the leakage point and protrudes out of the leakage point by 1.5m, the pressure of the injected soybean is based on compaction, and the pressure value is 1-5 MPa. And for the point-shaped leakage water at a plurality of positions, sequentially treating the leakage water according to the method. For different point-like leakage water of the same drilling hole, the point-like positions are developed from inside to outside according to the method.

In another embodiment, the soil body has planar leakage water, the leakage surface is drilled, the drilling depth is preferably up to the leakage point position and penetrates 2m of the leakage surface, the drilling distance is 0.5m-1m, the drilling diameter is 75mm-150mm, soybeans are injected from the hole bottom to the leakage surface and protrude 2m of the leakage surface, the pressure of injected soybeans is based on compaction, and the pressure value is 1MPa-5 MPa. The holes can be drilled in sequence during drilling, and soybeans are injected into the holes according to different hole simultaneous injection modes.

In the embodiment, the point-shaped leakage water and the planar leakage water are completely controlled, and the soil body compactness meets the subsequent construction requirement. The method is particularly suitable for emergency treatment of soil body water leakage, has the effect of emergency pre-quick treatment and has the efficient function of quickly plugging the water leakage. Meanwhile, the method can also be popularized to other projects needing soil body compaction.

The method of the invention reasonably mixes the soybean, the water and the bifidobacterium at a proper temperature. The rubber capsule plays a role of gradually expanding within 1 hour after being placed into a drilled hole, the soil body reaches compactness within 3 hours, the effect is fast, the emergency treatment is significant, the filling and reinforcing treatment can be carried out after the emergency treatment, and the construction period is not influenced; the method has the advantages of low cost, simple construction, good effect and popularization value.

While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.

Claims

1. A method for extruding a dense rock-soil body by soybean capsule ballooning is characterized in that mature soybeans are placed in a rubber capsule, water and a proper amount of bifidobacteria are added, and then the rubber capsule is sealed; placing the sealed rubber capsules in loose soil or rock-soil body drill holes with cracks arranged according to a set rule, and then backfilling the drill holes; the rubber capsule is continuously expanded by the water absorption and expansion action of the soybeans and the gas generated in the water absorption and expansion process of the soybeans to extrude the surrounding soil body, so that the cracks in the soil body are closed, and the soil body is dense.

2. The method for ballooning extruding compacted rock-soil mass with soybean capsules as claimed in claim 1, wherein the rubber capsules are butadiene rubber.

3. The method for the gas-swelling extrusion of dense rock-soil mass with soybean capsules as claimed in claim 1, wherein the size of the rubber capsules is experimentally determined according to the height of the soil mass to be compacted, the depth of the drilled holes and the distance between the drilled holes; the rubber capsule is compactly placed in the drill hole, and the drill hole is densely filled with backfill.

4. The method for ballooning and extruding a compacted rock-soil body with soybean capsules as claimed in claim 3, wherein the diameter of the rubber capsules is the same as or slightly smaller than the diameter of the drilled holes, and the length of the rubber capsules is 3m to 5 m.

5. The method for soybean capsule gas-expansion compaction of solid rock-soil mass according to claim 1, wherein for punctiform leakage water soil mass, drilling is carried out at the leakage point, the drilling depth is up to the leakage point position and passes through the leakage point by a distance h1, the diameter of the drilling hole is 75mm-150mm, and the rubber capsules injected into the soybean capsule after sealing are stacked from the bottom of the drilling hole to a distance h2 higher than the leakage point.

6. The method for ballooning compacting of compacted rock-soil mass with soybean capsules as claimed in claim 5, wherein h1 is 0.8-1.2m and h2 is 1.2-1.8 m.

7. The method for soybean capsule gas-expansion compaction of solid rock-soil mass according to claim 5 or 6, characterized in that for multi-point leaking water soil mass, holes are drilled from inside to outside in sequence according to the leaking point position from the leaking center, and each drilled hole is respectively provided with a sealing rubber capsule.

8. The method for soybean capsule air-inflation compaction of solid rock-soil mass according to claim 1, wherein for planar leakage water, the leakage surface is drilled with a depth of 0.5m-1m and a diameter of 75mm-150mm to the position of the leakage surface and across the distance h3, and rubber capsules injected into the soybean capsule are stacked from the bottom of the drilled hole to a distance h4 above the leakage surface.

9. The method for ballooning extruding compacted rock-soil mass with soybean capsules as claimed in claim 8, wherein h3 is 1.5-2.5m, h4 is 1.5-2.5 m; and simultaneously injecting the sealed rubber capsules into a plurality of drilled holes.

10. The method for ballooning compacting of compacted rock-soil mass with soybean capsules according to claim 1, wherein the ratio of soybean, water and bifidobacteria in the sealed capsules is 100:20: 5.