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CN-121992768-A - Electroosmosis reinforcing device and method for controlling soil body parameter gradient

CN121992768ACN 121992768 ACN121992768 ACN 121992768ACN-121992768-A

Abstract

The invention relates to the technical field of environmental engineering construction, and discloses an electroosmosis reinforcing device and method for controlling soil body parameter gradient, wherein the electroosmosis reinforcing device comprises an electroosmosis device, a comprehensive sensor and at least one high-pressure injection unit, the horizontal pipe in the high-pressure spraying unit is arranged between any two adjacent anodes and is used for spraying the regulating liquid in the horizontal direction and the vertical direction. According to the invention, the water content, the conductivity and the pH value of the soil body are monitored in real time through the embedded soil comprehensive sensor, and the injection regulation is automatically started when the parameter gradient exceeds the threshold value in combination with the limit gradient parameter determined by the pre-test, so that the soil body parameter gradient is maintained in an ideal interval, the control and the dynamic regulation of the reinforcement process are realized, the problems of electrode polarization, resistance rise and current drop caused by overlarge parameter gradient in the electroosmosis process are solved, and the persistence of the electroosmosis efficiency is ensured.

Inventors

  • SUN ZHAOHUA
  • WANG JING
  • WU CHANGJIE
  • SUN ZHAOBAO
  • JIANG SHENG
  • ZHANG YIRONG

Assignees

  • 南通大学

Dates

Publication Date
20260508
Application Date
20260324

Claims (9)

  1. 1. An electroosmosis strengthening device for controlling soil body parameter gradient, which is characterized by comprising The electroosmosis device (100) comprises a direct current power supply (110), anodes (120) and cathodes (130) which are arranged in an array, wherein the anodes (120) and the cathodes (130) are respectively connected to the positive electrode and the negative electrode of the direct current power supply (110) and are used for generating a direct current electric field to generate an electrolytic reaction so that hydration cations in pore water of a soil body (500) directionally migrate from the anodes (120) to the cathodes (130); the comprehensive sensor (200) at least comprises a water content measuring module, a conductivity testing module and a pH testing module, wherein the comprehensive sensor (200) is arranged between the anode (120) and the cathode (130) and is used for monitoring the water content, conductivity and pH parameter change in the soil body (500) in the electroosmosis strengthening process; and at least one high-pressure injection unit (300), wherein a transverse pipe (330) in the high-pressure injection unit (300) is arranged between any two adjacent anodes (120) and is used for injecting the regulating liquid in the horizontal direction and the vertical direction.
  2. 2. An electroosmosis reinforcing device for controlling soil body parameter gradients according to claim 1, characterized in that said high-pressure injection unit (300) comprises a header pipe (310), an elbow pipe (320), a transverse pipe (330) and a high-pressure pump (340); the first end of the main pipe (310) is connected with the high-pressure pump (340), and the second end is connected with the bent pipe (320); the bent pipe (320) is connected with the main pipe (310) and the transverse pipe (330); The transverse pipes (330) are arranged in the soil body (500) along a direction vertical to the surface of the soil body (500) in an array mode, and bent pipes (320) are arranged between any two adjacent transverse pipes (330) to be connected.
  3. 3. An electroosmosis reinforcing apparatus for controlling soil body parameter gradients as claimed in claim 2, wherein, The transverse tubes (330) are symmetrically arranged along the connecting line of any two adjacent anodes (120).
  4. 4. An electroosmosis reinforcing apparatus for controlling soil body parameter gradients as claimed in claim 2, wherein, The side surface of the transverse pipe (330) is provided with a jet pipe (331); the spraying pipes (331) are arranged along the length direction of the transverse pipe (330) and are parallel to the surface array of the soil body (500); The axis of the injection pipe (331) is inclined at 30-60 degrees with the axis of the transverse pipe (330), and the vector directions of the projections of the injection pipes (331) positioned on two sides of the connecting line of two adjacent anodes (120) on the axis of the transverse pipe (330) are opposite.
  5. 5. An electroosmosis reinforcing apparatus for controlling soil body parameter gradients as claimed in claim 2, wherein And a valve (321) is arranged on an elbow pipe (320) connected with the main pipe (310) in the high-pressure injection unit (300) and used for controlling the on-off of each injection unit.
  6. 6. An electroosmotic reinforcement method for controlling soil body parameter gradients using the device of any one of claims 1 to 5, comprising the steps of: S1, arranging an anode (120), a cathode (130), a comprehensive sensor (200) and a high-pressure injection unit (300) in soft soil to be reinforced; s2, acquiring a soil body (500) parameter limit gradient through a pre-test, and determining the injection pressure of the regulating fluid; S3, electrifying to perform electroosmosis reinforcement, monitoring parameters of a soil body (500) in real time and calculating a parameter gradient between a cathode and an anode; S4, when the parameter gradient reaches a preset starting threshold value, starting the high-pressure pump (340), and injecting the regulating liquid to the surrounding soil body (500) through the injection pipe (331) on the transverse pipe (330) until the parameter gradient falls back to a preset target zone, and stopping injecting the liquid; S5, repeating the step 3 and the step 4 until the water content of the soil body (500) near the cathode reaches the preset requirement; s6, recycling after the reinforcement is completed.
  7. 7. The method of electroosmotic reinforcement according to claim 6, wherein said pre-test in step S2 comprises: and inserting a pair of electrodes into the soil body (500) for electroosmosis reinforcement until the cathode drainage rate is reduced to a threshold value, measuring the water content, the conductivity and the pH value of the soil body (500) near the anode (120) and the cathode (130), and calculating the parameter gradient as a limit gradient.
  8. 8. The method according to claim 6, wherein the preset starting threshold in step S4 is 2/3 of the limit gradient, and the preset target interval is 1/3-1/2 of the limit gradient.
  9. 9. The method according to claim 6, wherein in the step S4, the adjusting liquid is injected into the surrounding soil body (500) through the injection pipe (331) on the horizontal pipe (330), and a gap is provided between the anode (120) and the injection streamline (400) formed by the injection of the adjusting liquid.

Description

Electroosmosis reinforcing device and method for controlling soil body parameter gradient Technical Field The invention belongs to the technical field of environment-friendly engineering construction, and particularly relates to an electroosmosis reinforcing device and method for controlling soil body parameter gradient. Background The electroosmosis method is a technology widely applied to soft soil foundation reinforcement, and under the action of a direct current electric field, hydrated cations in soil body directionally migrate to a cathode to drive pore water to flow, so that the drainage consolidation of the soil body is accelerated. When the reinforcement process is carried out to a certain stage, the soil body parameter gradient reaches a limit state, the anode region is too dry, the electric contact condition between the anode and the soil body is rapidly deteriorated, and the interface contact resistance is rapidly increased. According to ohm's law, under certain voltage condition, the total current approaches zero due to overlarge loop resistance, electroosmosis driving force disappears, the drainage process is terminated, and electroosmosis failure is caused. In the direction from the anode to the cathode, soil in the area from the middle to the cathode cannot be fully drained. Publication number CN102182174B discloses a method for combining chemical solution injection electroosmosis method with gravel pile composite foundation, which utilizes the synergistic effect of electroosmosis and chemical reaction to raise soil body strength by inserting metal electrode into gravel pile and injecting chemical solution of calcium chloride, sodium silicate and the like. But the injection point is limited in the stone pile, the solution can not actively and accurately regulate and control soil parameters of different areas between the cathode and the anode, and the problem of electroosmosis efficiency reduction caused by overlarge parameter gradient is difficult to solve. Publication number CN107587498a discloses an anode pressurizing combined electroosmosis method for reinforcing a soft clay system, which is characterized in that high-pressure gas is introduced into an anode tube to promote water to be extruded and discharged towards a cathode tube, and the drainage efficiency can be further improved through electrode switching and flocculant injection. The scheme adopts a gas pressurizing mode to drive moisture migration, but does not relate to active regulation and control of the parameter gradients of the moisture content, the conductivity, the pH value and the like of the soil body, and can not solve the problem of electroosmosis failure caused by excessive drying and rapid resistance increase of an anode region. Therefore, there is a need for an electroosmosis reinforcing device capable of monitoring the soil parameter change in real time and actively regulating and controlling the soil parameter gradient between the anode and the cathode. Disclosure of Invention The invention aims to provide an electroosmosis reinforcing device and method for controlling soil body parameter gradient, which solve the problem that soil body drainage consolidation cannot be normally promoted due to soil body parameter gradient between anode and cathode. The technical scheme adopted by the invention is as follows: according to a first aspect of an embodiment of the present invention, there is provided an electroosmosis reinforcing apparatus for controlling a soil body parameter gradient, comprising: The electroosmosis device comprises a direct current power supply, anodes and cathodes which are arranged in an array, wherein the anodes and the cathodes are respectively and electrically connected to the anode and the cathode of the direct current power supply and are used for generating a direct current electric field to generate electrolytic reaction so as to lead hydration cations in soil body pore water to directionally migrate from the anodes to the cathodes; the comprehensive sensor at least comprises a water content measuring module, a conductivity testing module and a pH testing module, and is arranged between the anode and the cathode and used for monitoring the water content, conductivity and pH parameter change in the soil body in the electroosmosis strengthening process; and at least one high-pressure injection unit, wherein a transverse pipe in the high-pressure injection unit is arranged between any two adjacent anodes and is used for injecting the regulating liquid in the horizontal direction and the vertical direction. In some embodiments, the high pressure injection unit comprises a manifold, an elbow, a cross tube, and a high pressure pump; the first end of the main pipe is connected with the high-pressure pump, and the second end of the main pipe is connected with the bent pipe; the bent pipe is connected with the main pipe and the transverse pipe; The transverse pipes are arranged in the soil body along