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CN-122016434-A - Improved single-phase injector test device and method

CN122016434ACN 122016434 ACN122016434 ACN 122016434ACN-122016434-A

Abstract

The invention discloses an improved single-phase injector test device and method, and particularly relates to the technical field of biological solidification rock and soil bodies. The device comprises a container, a porous mold, geotextile, two permeable stones, a urease solution, cementing liquid and a circulating assembly, wherein the porous mold is placed in the container, the geotextile is attached to the inside of the porous mold and is used for wrapping a sample, the two permeable stones are respectively arranged on the upper side and the lower side of the sample, the urease solution is pumped into the top of the container from the top of the container through a first input pipe and permeates through the permeable stones on the upper side, the cementing liquid is pumped into a cavity between the container and the porous mold from the top of the container through a second input pipe, and the circulating assembly is used for conveying reaction residual liquid in the container to the top of the container again and permeates through the permeable stones on the upper side. By adopting the technical scheme of the invention, the problems that the reaction residual liquid cannot be recycled, the reaction is uneven and the like in the existing single-phase injector test device are solved, and the recycling of resources and the more uniform solidification effect are realized.

Inventors

  • ZHANG FEI
  • ZENG RUMENG
  • WANG ZHENYU
  • LIU XIANDONG
  • SHI CONG
  • WEN LEI
  • WANG TIANLIANG
  • SONG HONGFANG

Assignees

  • 石家庄铁道大学

Dates

Publication Date
20260512
Application Date
20260313

Claims (6)

  1. 1. An improved single-phase injector testing apparatus, comprising: A container (1); The porous mold (2) is placed in the container (1), and small holes for liquid circulation are formed in the side wall of the porous mold; The geotextile (5) is attached to the inside of the porous mold (2), and the geotextile (5) is used for coating a sample; The two permeable stones (4) are respectively arranged at the upper side and the lower side of the sample, and each permeable stone (4) is propped against the container (1); A urease solution pumped from the top of the container (1) through a first input pipe (11) and penetrating to the top of the sample via the upper permeable stone (4); Cementing fluid is pumped from the top of the container (1) into the cavity between the container (1) and the porous mould (2) through the second input pipe (12) and permeates from the side of the sample through the small holes of the porous mould (2); And the circulating assembly is used for conveying the reaction residual liquid at the bottom of the container (1) to the top of the container (1) again and penetrating through the permeable stone (4) at the upper side.
  2. 2. The improved single-phase injector test device according to claim 1, wherein the circulating assembly comprises a liquid outlet pipe (13), the liquid outlet pipe (13) is communicated with the bottom of the container (1) and is propped against the permeable stone (4), the liquid outlet pipe (13) is communicated with a collecting box (10), the collecting box (10) is communicated with a single-head peristaltic pump (6), the other end of the single-head peristaltic pump (6) is provided with a circulating pipe (15), and the circulating pipe (15) is communicated with the top of the container (1) and is propped against the permeable stone (4).
  3. 3. An improved single-phase injector test set according to claim 1, characterized in that the thickness of the permeable stone (4) is 5mm.
  4. 4. An improved single-phase injector test set according to claim 1, wherein the second inlet tube (12) is in close proximity to the inner wall of the porous mold (2).
  5. 5. The improved single-phase injector test apparatus as claimed in any one of claims 1-4, wherein the test apparatus is used as follows: s1, wrapping a soil body sample in geotechnical cloth (5), respectively placing two permeable stones (4) on the upper side and the lower side of the soil body sample, then placing the soil body sample, the geotechnical cloth (5) and the permeable stones (4) into a porous mold (2) together, and placing the porous mold (2) into a container (1); S2, pumping a urease solution and a cementing agent into a permeable stone (4) positioned at the top of the porous mold (2) and a cavity between the porous mold (2) and the container (1) through a first input pipe (11) and a second input pipe (12) by a double-head peristaltic pump (7); S3, reinjecting the reacted residual liquid to the top of the soil body sample through a circulating assembly; S4, stopping injection when the water level line reaches the uppermost end, and taking out the soil body sample for next maintenance after the water level gradually drops to the bottom of the container (1).
  6. 6. The test device for the improved single-phase injector according to claim 5, wherein the flow rate of the urease solution is set to be 2ml/min, the flow rate of the cementing liquid is set to be 1.5ml/min, the flow rate of the single-head peristaltic pump (6) is set to be 60% of the total flow rate of the double-head peristaltic pump (7), and if the water level continuously rises, the flow rate of the single-head peristaltic pump (6) is regulated down by a gradient of 5%, and otherwise, the flow rate of the single-head peristaltic pump is regulated up.

Description

Improved single-phase injector test device and method Technical Field The invention relates to the technical field of biological solidified rock and soil bodies, in particular to an improved single-phase injector test device and method. Background In recent years, the global environmental problem becomes more serious, and the problems of greenhouse effect, land pollution and the like caused by human activities bring great pressure to the ecology of the earth. Under the background, the use of green natural, energy-saving and environment-friendly materials is actively advocated by various countries so as to reduce the negative influence on the environment and promote sustainable development. In the field of geotechnical engineering, traditional geotechnical reinforcement technologies such as dynamic compaction, drainage consolidation, grouting and the like have been dominant for a long time. However, these conventional techniques have a number of drawbacks. The construction method has the advantages that the construction method is high in cost, the cost investment of engineering projects is increased from the aspect of economy, a long construction period is often needed in the aspect of construction time, the overall progress of engineering is affected, and a large amount of manpower, material resources and energy resources are consumed in the aspect of resource consumption, so that the requirements of current energy conservation and environmental protection are not met. More serious, part of the traditional technology also causes pollution to the surrounding environment in the construction process, and further destroys the ecological balance. Therefore, it is urgent to find a novel environment-friendly rock-soil body treatment technology. Biological solidification (EICP/MICP) has emerged as an emerging technology for the treatment of rock and soil. Based on the principle that organisms generate inorganic minerals through the regulation and control of biological macromolecules, the soil body is reinforced by utilizing carbonate generated by biological induction. The technology has the advantages of environmental protection, resource saving and the like, meets the current requirement on sustainable development, and gradually becomes a research hotspot in the geotechnical engineering field. In the biological solidification technology, the solidification mode plays a key role in the distribution of calcium carbonate in EICP/MICP solidified soil. At present, the curing modes commonly used in the indoor test mainly comprise four methods of a soaking method, a pre-mixing method, a single-phase injection method and a two-phase injection method. Through a great number of researches and practices, the single-phase injection method is most outstanding in the aspect of reinforcement effect, can more effectively reinforce the soil body and improve the strength and stability of the soil body. Although single-phase injection has significant advantages, conventional single-phase injection has the following drawbacks: 1) The urease solution reacts rapidly with the cement at the sample inlet, resulting in the deposition of a large amount of calcium carbonate at the inlet. The local excessive deposition phenomenon not only can block the injection channel to influence the injection of subsequent reagents, but also can lead to uneven distribution of calcium carbonate in soil body and reduce the overall reinforcement effect; 2) Because of the unidirectional injection mode, the flow and reaction of the reagent at the bottom of the sample are limited, so that the reaction of the area at the bottom of the sample is insufficient, and uniform and compact calcium carbonate precipitate cannot be formed, thereby affecting the reinforcing quality of the bottom of the soil body; 3) The residual liquid is directly discharged and cannot be recycled, so that the reagent utilization rate is less than 50%, the cost input is increased, and meanwhile, the environmental protection requirement is not met. In view of the above-mentioned drawbacks of the conventional single-phase injection method, it is necessary to improve the existing single-phase injector test device to improve the effect and efficiency of the bio-curing technology, and promote the geotechnical engineering field to develop toward a more environment-friendly and efficient direction. Disclosure of Invention The invention aims to provide an improved single-phase injector test device and method, which solve the problems of low reagent utilization rate and the like caused by the deposition and blockage of a reagent inlet, insufficient reaction at the bottom of a sample and incapability of recycling reaction residual liquid in the conventional single-phase injector test device. In order to achieve the above purpose, the technical scheme of the invention is as follows, an improved single-phase injector test device and method, comprising: A container; The porous mold is placed in the cont