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CN-122016570-A - Simulation atomization grouting device and method for soft stratum

CN122016570ACN 122016570 ACN122016570 ACN 122016570ACN-122016570-A

Abstract

The invention belongs to the technical field of engineering simulation, and discloses a soft stratum simulation atomization grouting device and method. The device comprises a double pressure supply device, a slurry storage barrel, an atomizer comprising an atomization bin and an ultrasonic atomization sheet, a nozzle, a pressure monitor, a test piece box and a slurry recycling barrel, wherein all components are connected with a valve through pipelines to form a complete grouting system. According to the method, slurry is atomized, pressure is regulated and controlled by combining a double pressure supply device, and pressure change is captured in real time by matching with a pressure monitor, so that the diffusion front information of the slurry is grasped dynamically. The invention effectively solves the technical problems of poor suitability of slurry and loose stratum, low grouting pressure control precision and lack of effective real-time monitoring in the prior art, greatly improves the permeability and diffusion uniformity of the slurry in the stratum, avoids stratum disturbance or structural damage caused by out-of-control grouting, provides accurate parameter support for site construction through an indoor simulation experiment, obviously reduces trial-and-error cost, and improves the grouting reinforcement reliability and engineering practicability of the soft stratum.

Inventors

  • LIU JIE
  • ZENG KAI
  • WANG YONGCHAO
  • LI YI
  • ZENG LING
  • Huang Xiangshi
  • YU JINHONG

Assignees

  • 长沙理工大学

Dates

Publication Date
20260512
Application Date
20260108

Claims (10)

  1. 1. A soft stratum simulation atomization grouting device is characterized by comprising a slurry storage barrel (3), wherein the slurry storage barrel (3) is connected with an atomization device through a pipeline (10), the atomization device comprises an atomization bin (4) and an atomizer (7) assembled in the atomization bin (4), the atomization bin (4) is connected with a nozzle (8) through the pipeline (10), the nozzle (8) extends into a test piece box (6), a first pressure pump (1) is connected with the atomization bin (4) through the pipeline (10), a second pressure pump (2) is connected with the slurry storage barrel (3) through the pipeline (10), a valve (11) and a pressure monitor (9) are correspondingly assembled on the pipeline (10), and a slurry recycling barrel (5) is respectively connected with the atomization bin (4) and the slurry storage barrel (3) through the pipeline (10).
  2. 2. The simulated atomized grouting device for the soft stratum according to claim 1, wherein the atomizer (7) comprises an ultrasonic atomization sheet (12), an energy supply device (13) and an atomization switch (14), the energy supply device (13) is electrically connected with the ultrasonic atomization sheet (12), and the atomization switch (14) is used for controlling the power supply on-off of the energy supply device (13) and the ultrasonic atomization sheet (12).
  3. 3. The simulated atomized grouting device for the soft stratum according to claim 1 is characterized in that a pressure monitor (9) is assembled on a pipeline (10) between the atomized bin (4) and the nozzle (8), a valve (11) is arranged on a section of the pipeline (10) between the pressure monitor (9) and the atomized bin (4), the pressure monitor (9) is assembled on the pipeline (10) between the atomized device and the first pressure pump (1), and the pressure monitor (9) is arranged on the pipeline (10) between the slurry storage barrel (3) and the second pressure pump (2).
  4. 4. A simulated atomized grouting device for a soft stratum as claimed in claim 1, wherein a pipeline (10) extending to the slurry recovery barrel (5) is arranged at the bottom of the slurry storage barrel (3), and a valve (11) is arranged on the pipeline (10).
  5. 5. A soft stratum simulated atomization grouting device as claimed in claim 2, wherein the ultrasonic atomization sheet (12) is fitted at the interface of the end of the pipe (10) and the atomization bin (4).
  6. 6. A simulated atomized grouting device as claimed in claim 1, wherein the inner diameter of said pipe (10) is selected to be 25-32mm and the length of said pipe (10) into said test piece box (6) is not more than 2m.
  7. 7. A simulated atomized grouting method for a soft stratum, which is implemented based on the simulated atomized grouting device for the soft stratum according to any one of claims 1-6, and comprises the following steps: S1, performing material preparation operation and completing assembly and debugging operations of all devices, wherein the material comprises grouting slurry after configuration; s2, starting an atomization device, and simultaneously opening a valve (11) of a pipeline (10) corresponding to the space between the slurry recycling bin (5) and the atomization bin (4) to enable atomized slurry in the atomization bin (4) to be saturated; s3, starting a first pressure pump (1) to enable atomized slurry to fill an atomization bin (4); S4, after the slurry flows into the slurry recycling bin (5), closing a valve (11) of a pipeline (10) corresponding to the slurry recycling bin (5), and then starting a second pressure pump (2) to observe the slurry flowing state and the grouting molding effect of the test block in real time; s5, closing the atomizer (7) and simultaneously closing a valve (11) of a pipeline (10) above the nozzle (8); S6, moving the pipeline (10) above the nozzle (8) upwards for a preset distance, and repeatedly executing the grouting related operations from S2 to S6 until grouting is completed in the injected area, and executing the subsequent steps; S7, opening a valve (11) between the slurry recycling bin (5) and the slurry storage bin (3), and closing the corresponding switches and the valves (11) of all devices after the slurry is completely converged into the slurry recycling bin (5); and S8, turning off all the equipment, cleaning the grouting pipe and other related equipment, and then opening the test piece box (6) to take out the filled sample.
  8. 8. The simulated atomization grouting method of a soft stratum according to claim 7, wherein the slurry prepared in the step S1 is an acrylic acid salt or epoxy resin type low-viscosity grouting material, the mixing ratio of the epoxy resin and the curing agent of the epoxy resin slurry is 8:1-10:1, the specific ratio can be adjusted according to the practical experimental effect, and the viscosity of the slurry is less than or equal to 100cp after necessary heating pretreatment.
  9. 9. The simulated atomized grouting method for the soft stratum according to claim 7, wherein the pressure control requirements of the first pressure pump (1) and the second pressure pump (2) are that the initial grouting pressure is controlled to be 0.01MPa level, the pressure is regulated and controlled in a gradual pressure increasing mode, the maximum grouting pressure is controlled to be within a range of 0.05MPa to 0.1MPa according to the compactness degree of the simulated stratum and the characteristic difference of grouting materials, the maximum grouting pressure is not more than 0.05MPa for the simulated stratum with particularly soft texture, and the grouting pressure is monitored in real time by adopting a high-precision pressure sensor with the precision of +/-0.001 MPa, so that the pressure is ensured to be within the set range.
  10. 10. The simulated atomized grouting method of a soft stratum according to claim 7, wherein the numerical change of the pressure monitor (9) is observed in real time in the grouting process and the grouting state is judged, if the pressure is suddenly reduced, the grouting material is proved to be opened up into a permeation channel, is diffused to a preset diffusion boundary or encounters a large cavity area, and if the pressure is continuously increased, the grouting material is proved to be higher in stratum compactness, the grouting material is more difficult to permeate, or the pipeline (10) and the nozzle (8) are at risk of blockage.

Description

Simulation atomization grouting device and method for soft stratum Technical Field The invention belongs to the technical field of engineering simulation, and particularly relates to a soft stratum simulation atomization grouting device and method. Background In the current underground engineering field, chemical grouting treatment for soft stratum (such as silt clay, sand-washed layer and the like) still faces a plurality of technical problems. The existing grouting process such as China patent CN220927862U (a high-pressure jet grouting device for roadbed engineering) has the key defects that firstly, the suitability of a slurry system and a loose stratum is insufficient. The critical permeable pore size of the conventional high polymer grouting material is generally larger than 20 mu m, so that the conventional high polymer grouting material is difficult to effectively infiltrate into formations with micron-sized pore structures such as fine sand layers, and the effective filling and consolidation effects of slurry are limited. Secondly, grouting pressure control accuracy is low, an error range of +/-0.5 MPa usually exists, and accurate regulation and control of slurry diffusion behaviors are difficult to achieve. Such pressure fluctuations tend to cause the slurry diffusion profile to deviate from an ideal columnar permeation model. For example, in a water-rich sandstone formation, when the grouting pressure exceeds a critical value (e.g., 0.8 MPa), the slurry diffusion radius will exhibit an exponential increase in the tendency to cause unexpected formation disturbance or structural failure. Third, the lack of effective real-time monitoring means can not dynamically grasp the diffusion front information of the slurry in the stratum. Such information loss may cause the slip casting process to be out of control, for example, a certain tunnel engineering can not judge the slurry diffusion boundary in time to terminate the slip casting operation, and finally cause the staggered amount of the pipe segment to exceed the standard (> 5 mm), thereby affecting the structural safety and the construction quality. Therefore, there is a need to provide a chemical grouting test device suitable for use in soft formations to obtain dynamic information of slurry diffusion fronts. Disclosure of Invention The embodiment of the invention aims to provide a simulated atomization grouting device for a soft stratum, which realizes high-precision observation of grouting of the soft stratum by atomizing slurry so as to acquire dynamic information of a slurry diffusion front, and provides guidance for solving the problems of poor suitability of process slurry and the loose stratum, inaccurate grouting pressure control and the like. A second object of embodiments of the present invention is to provide a simulated atomized grouting method for a soft formation. The technical scheme includes that the soft stratum simulated atomization grouting device comprises a slurry storage barrel, wherein the slurry storage barrel is connected with an atomization device through a pipeline, the atomization device comprises an atomization bin and an atomizer assembled in the atomization bin, the atomization bin is connected with a nozzle through a pipeline, the nozzle extends into a test piece box, a first pressure pump is connected with the atomization bin through a pipeline, a second pressure pump is connected with the slurry storage barrel through a pipeline, a valve and a pressure monitor are correspondingly assembled on the pipeline, and a slurry recycling barrel is connected with the atomization bin and the slurry storage barrel through pipelines respectively. Further, the atomizer comprises an ultrasonic atomizing sheet, an energy supply device and an atomizing switch, wherein the energy supply device is electrically connected with the ultrasonic atomizing sheet, and the atomizing switch is used for controlling the power supply on-off of the energy supply device and the ultrasonic atomizing sheet. Furthermore, a pressure monitor is arranged on a pipeline between the atomizing bin and the nozzle, a valve is arranged on a pipeline section between the pressure monitor and the atomizing bin, the pressure monitor is arranged on a pipeline between the atomizing device and the first pressure pump, and the pressure monitor is arranged on a pipeline between the pulp storage barrel and the second pressure pump. Further, a pipeline extending to the slurry recycling bin is arranged at the bottom of the slurry storage bin, and a valve is arranged on the pipeline. Further, the ultrasonic atomizing sheet is assembled at the joint of the tail end of the pipeline and the atomizing bin. Further, the inner diameter of the pipeline is 25-32mm, and the length of the pipeline connected into the test piece box is not more than 2m. The simulated atomized grouting method for the soft stratum is implemented based on the simulated atomized grouting device for the soft