CN-122013795-A - Siphon-driven microorganism anti-liquefaction and anti-seepage injection type side slope reinforcement device and construction method

CN122013795ACN 122013795 ACN122013795 ACN 122013795ACN-122013795-A

Abstract

The invention discloses an injection type side slope reinforcement device for resisting liquefaction and seepage of siphon-driven microorganisms and a construction method, comprising a siphon negative pressure starting device, a water flow high-pressure gas injection device, a microorganism high-pressure gas injection atomization device, a microorganism liquid storage device, a gas-liquid mixing device and a soil gas injection device, wherein the siphon negative pressure starting device is of a venturi structure, a water outlet section of the siphon negative pressure starting device is in sealed series connection with a water inlet of the water flow high-pressure gas injection device, the water flow high-pressure gas injection device is of an unpowered high-pressure gas flow generating mechanism, a gas injection end of the water flow high-pressure gas injection device is in sealed series connection with the microorganism high-pressure gas injection atomization device through a unidirectional gas injection component, the throat of the microorganism high-pressure gas injection atomization device is of a venturi structure, a diffusion section of the microorganism high-pressure gas injection atomization device is in sealed series connection with the microorganism liquid storage device, and the soil gas injection device are used for uniformly mixing atomized microorganism liquid and high-pressure gas flow and injecting the mixture into a side slope soil body. The invention can improve the siphon stability and the pipeline decontamination capability of the slope reinforcement device.

Inventors

WANG YIQUAN
CHEN YUMIN
Qin Chengchao
Li Chenmeng
SHEN RUIHAN

Assignees

河海大学

Dates

Publication Date: 20260512
Application Date: 20260306

Claims (10)

1. The siphon-driven microorganism anti-liquefaction and anti-seepage injection type slope reinforcement device is characterized by comprising a siphon negative pressure starting device (1), a water flow high-pressure gas injection device (2), a microorganism high-pressure gas injection atomization device (3), a microorganism liquid storage device, a gas-liquid mixing device and a soil gas injection device (4); The siphon negative pressure starting device (1) is of a venturi structure, a water outlet section (10) of the siphon negative pressure starting device is connected with a water inlet of the water flow high-pressure gas injection device (2) in series in a sealing way, so that gas-liquid two-phase flow is formed and water flow is driven to be input; The water flow high-pressure gas injection device (2) is an unpowered high-pressure gas flow generating mechanism, and the gas injection end of the water flow high-pressure gas injection device is connected with the microorganism high-pressure gas injection atomizing device (3) in series in a sealing way through a one-way gas injection assembly and is used for converting water flow inertia into high-pressure gas flow; The microbial high-pressure injection atomizing device (3) is of a venturi structure, the throat part of the device is communicated with the microbial liquid storage device in a sealing way, and the diffusion section is connected with the gas-liquid mixing device in series and is used for realizing negative pressure suction and atomization of microbial liquid; The gas-liquid mixing device is connected with the soil body gas injection device (4) in series in a sealing way and is used for injecting atomized microorganism liquid and high-pressure air flow into the soil body of the side slope after being uniformly mixed.
2. The siphon-driven microorganism liquefaction-resistant and seepage-proof injection type side slope reinforcement device according to claim 1, wherein the siphon negative pressure starting device (1) comprises a water inlet section (8), a negative pressure mouth section (9) and a water outlet section (10) which are sequentially arranged along the water flow direction, a suction hole (11) is formed in the side wall of the negative pressure mouth section (9), the suction hole (11) is communicated with the outside atmosphere, and a waterproof and breathable membrane assembly is embedded at the end part of a gas pipe.
3. The siphon-driven microbial liquefaction-resistant and seepage-proof injection type side slope reinforcement device is characterized in that the water flow high-pressure air injection device (2) comprises a U-shaped pipe (5), a water lifting valve (6), a water drain valve (7), an air supplementing component and an air injection component, wherein the U-shaped pipe (5) is divided into a drainage side pipe section, a bottom communication section and a backflow side pipe section, the water lifting valve is arranged at the bottom of the drainage side pipe section, the water drain valve (7) is arranged at the top end of the backflow side pipe section, the air supplementing component is a one-way air inlet valve (21) and is arranged at the top of the drainage side pipe section, and the air injection component is provided with an air exhaust check valve (20) and is arranged at the top of the drainage side pipe section in a staggered manner with the air supplementing component.
4. The siphon-driven microbial liquefaction-resistant and seepage-proof injection type side slope reinforcement device according to claim 1, wherein the microbial high-pressure injection atomizing device (3) comprises an integrally formed atomization shrinkage section, an atomization throat and an atomization diffusion section, a liquid suction port (12) is formed in the side wall of the atomization throat, a self-sealing elastic micro-slit membrane is embedded in the inner side of the liquid suction port (12), micro-slits are prefabricated on the surface of the membrane, the micro-slits are naturally closed when no negative pressure exists, and the micro-slits are opened by elastic deformation when the negative pressure exists.
5. The siphon-driven microbial liquefaction-resistant and seepage-proof injection type side slope reinforcement device according to claim 1, wherein the microbial liquid storage device comprises a storage tank (16), a liquid conveying pipe and a flow regulating valve (17), one end of the liquid conveying pipe is communicated with the bottom of the storage tank (16), the other end of the liquid conveying pipe is in sealing connection with a liquid suction port (12) of an atomization throat, and the flow regulating valve (17) is connected in series with the liquid conveying pipe.
6. The siphon-driven microorganism liquefaction-resistant and seepage-proof injection type side slope reinforcement device according to claim 1, wherein the gas-liquid mixing device comprises a sealed cavity and a spiral guide vane, the spiral guide vane is spirally arranged along the inner wall of the cavity, and an anti-adhesion groove body (13) is formed in the surface of the spiral guide vane.
7. The siphon-driven microorganism liquefaction-resistant and seepage-proof injection type side slope reinforcement device according to claim 1, wherein the soil body gas injection device (4) is of a folded pipe structure, a plurality of inclined nozzles (18) are uniformly distributed on the periphery of the side wall of the soil body gas injection device, and the inclined direction of the nozzles (18) forms an included angle of 30-60 degrees with the axis of the soil body gas injection device (4).
8. The siphon-driven microorganism liquefaction-resistant and seepage-proof injection type side slope reinforcement device according to claim 3, wherein the bottom communication section of the U-shaped pipe (5) adopts an arc transition structure, the opening pressure of the water raising valve (6) is smaller than the closing pressure of the water draining valve (7), the air supplementing assembly and the air passage of the air injecting assembly are mutually independent and are all provided with one-way sealing structures, the water inlet pipe (19) of the U-shaped pipe is in sealing connection with the water outlet section (10) of the siphon negative pressure starting device, and the water outlet (22) is arranged at the bottom of the water draining side pipe section.
9. The siphon-driven microbial liquefaction-resistant and seepage-proof injection type side slope reinforcement device according to claim 4, wherein the elastic modulus of the self-sealing elastic micro-slit membrane is 1.5-3MPa, the width of the prefabricated micro-slits is 0.1-0.3mm, and the number of the micro-slits is 3-5, and the micro-slits are distributed in a radial mode.
10. A method of constructing an injection type slope reinforcement device based on siphon-driven microbial liquefaction-resistant and seepage-resistant as claimed in any one of claims 1 to 9, comprising the steps of: 1) Pre-burying a siphon negative pressure starting device in a side slope, connecting a water inlet section (8) of the siphon negative pressure starting device into a side slope water outlet, sealing and communicating a water outlet section (10) with a water inlet of a water flow high-pressure gas injection device, inserting a soil gas injection device (4) into a side slope for a preset depth, fixing all the devices and checking sealing performance; 2) Filling the prepared microorganism solidification slurry into a storage tank (16) of a microorganism liquid storage device, and adjusting a flow regulating valve (17) to a preset opening; 3) The siphon starting is that the side slope water flows in through a water inlet section (8) of the siphon negative pressure starting device, negative pressure is formed in a negative pressure necking section (9), a one-way anti-seepage ventilation valve is opened, the outside atmosphere enters a flow passage to form a gas-liquid two-phase flow, and the water flow is driven to continuously enter a water flow high-pressure gas injection device; 4) The high-pressure air flow is generated, namely the water flow high-pressure air injection device continuously generates high-pressure air flow and conveys the high-pressure air flow to the microorganism high-pressure air injection atomization device (3) according to the cyclic work of water injection acceleration, water drain valve closing, water flow inertial conversion high pressure, water drainage, high-pressure air flow output and pressure fall-back reset; 5) The high-pressure air flows through an atomization contraction section to accelerate and form negative pressure at an atomization throat, a self-sealing elastic micro-slit diaphragm is opened, the microbial liquid is sucked and sheared and atomized by air flow, the atomized microbial liquid and the high-pressure air flow enter a gas-liquid mixing device, spiral flow guide sheets are used for guiding the microbial liquid and the high-pressure air flow to form rotational flow mixing, and an anti-adhesion groove body (13) is used for avoiding adhesion of atomized particles; 6) And (3) soil body injection, namely injecting uniformly mixed atomized microorganism liquid and high-pressure air flow into the soil body of the side slope through an inclined nozzle (18) of the soil body air injection device (4), so as to finish liquefaction resistance, seepage resistance and reinforcement.

Description

Siphon-driven microorganism anti-liquefaction and anti-seepage injection type side slope reinforcement device and construction method Technical Field The invention relates to a slope reinforcement device and a construction method, in particular to a siphon-driven microorganism anti-liquefaction and anti-seepage injection type slope reinforcement device and a construction method. Background Soil instability and slope seepage in slope engineering are core technical problems that soil instability is manifested as sudden drop of strength of slope soil under dead weight, seepage or external disturbance, and disasters such as landslide and collapse are caused. The seepage of the slope body can raise the pore water pressure of the soil body, reduce the effective stress, further aggravate the soil body and unstably risk, and meanwhile, can also cause the problems of piping, flowing soil and the like, thereby seriously threatening the safety of the slope engineering. The microorganism-induced calcium carbonate precipitation (MICP) technology is gradually applied to slope soil reinforcement by virtue of the advantages of environmental protection and small disturbance, and at present, related schemes for applying the MICP atomization reinforcement technology to slope engineering have been studied, such as the patent number of CN201910813677.X. The prior art realizes atomization injection of MICP technology by driving microorganism liquid atomization through an independent high-pressure pump, but the following key technical defects still exist: 1. The energy utilization rate is low. The microorganism atomizing device in the prior art needs to be additionally provided with independent power equipment such as a high-pressure pump, an ultrasonic atomizer and the like, is not multiplexed with the water flow impact energy of the slope drainage system, and has the advantages of equipment redundancy, high energy consumption and no compliance with the development requirements of green engineering. 2. The atomization mixing effect is poor. In the prior art, the microbial liquid is atomized and then directly injected into the soil body, a special gas-liquid mixing strengthening device is lacked, atomized particles and air flow are unevenly mixed, so that the penetration depth of the microbial liquid in the soil body is uneven, the calcium carbonate precipitation distribution is discrete, the strengthening effect stability is poor, and the requirement of slope engineering on strengthening uniformity is difficult to meet. In addition, the traditional siphon drainage device is a closed flow channel, and sediment and sundries carried in side slope water flow easily cause the flow channel to be blocked to cause siphon interruption, so that the drainage efficiency and the continuous operation capability of the device are affected. In summary, the existing MICP atomization reinforcement technology has the problems of low energy utilization rate and poor atomization mixing effect, and the traditional siphon drainage device has the defects of insufficient stability and decontamination capability, so that the siphon collaborative atomization microorganism liquid reinforcement device which has the functions of integrated and energy-saving siphon stable operation, pipeline decontamination and microorganism uniform reinforcement is urgently required to be developed. Disclosure of Invention The invention aims to provide an injection type slope reinforcement device for siphon-driven microorganism liquefaction resistance and seepage prevention and a construction method thereof, wherein the siphon stability and the pipeline decontamination capability are improved by multiplexing slope water flow impact energy, realizing unpowered high-pressure air flow generation and microorganism liquid atomization and combining a gas-liquid two-phase flow design. The invention has the technical scheme that the device comprises a siphon negative pressure starting device, a water flow high-pressure gas injection device, a microorganism high-pressure gas injection atomization device, a microorganism liquid storage device, a gas-liquid mixing device and a soil gas injection device; the siphon negative pressure starting device is of a venturi structure, and a water outlet section of the siphon negative pressure starting device is connected with a water inlet of the water flow high-pressure gas injection device in series in a sealing way and is used for forming gas-liquid two-phase flow and driving water flow to be input; The water flow high-pressure gas injection device is an unpowered high-pressure gas flow generating mechanism, and a gas injection end of the water flow high-pressure gas injection device is connected with the microorganism high-pressure gas injection atomization device in series in a sealing way through a one-way gas injection assembly and is used for converting water flow inertia into high-pressure gas flow; the high-pressure microbial injection