Model test device and method for curtain grouting and excavation of tunnels in high-temperature, water-rich and weak strata

Patent metadata

Field	Value
Publication number	US-12488706-B2
Application number	US-202318301268-A
Country	US
Kind code	B2
Filing date	Apr 17, 2023
Priority date	Apr 19, 2022
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

This invention discloses a model test device and method for curtain grouting and excavation of tunnels in high-temperature, water-rich and weak strata, comprising weak strata simulation system, working condition simulation system, curtain grouting system, and monitoring and data acquisition system. The weak strata simulation system is the main box used to fill the soft soil. The working condition simulation system includes a high geothermal simulation system, a water pressure simulation system with stepwise loading of water pressure and volume, and a three-dimensional confining pressure simulation system with stepwise controllable loading of confining pressure. The invention can realize the whole test process simulation of grouting reinforcement and excavation of tunnels in weak strata effectively under the action of confining pressure and geothermal heat, and it has a positive reference effect on actual soft stratum tunnel curtain grouting and safe excavation.

First claim

What is claimed is:

1 . A curtain grouting and excavation model test device for tunnels in high-temperature, water-rich and weak strata, comprising a weak strata simulation system, a curtain grouting system, a working condition simulation system, and a monitoring and data acquisition system,
wherein the weak strata simulation system is a main box body used to fill soft soil, a front side of the weak strata simulation system is a slurry entry surface, a back side of the weak strata simulation system is a slurry exit surface, centers of both the slurry entry surface and the slurry exit surface are equipped with an arched excavation chamber, several grouting holes with the shapes of clubs are arranged on the outer edge of the arched excavation chamber on the slurry entry surface, each of the grouting holes connects to a segmented grouting device located in the weak strata simulation system, and each of the segmented grouting device includes a laterally extending grouting pipe, a plurality of grouting hoses corresponding to an advance curtain grouting reinforcement area before tunnel excavation are connected in parallel to the side wall of the grouting pipe, and each of the grouting hose is provided with a plurality of grout overflow holes, in the segmented grouting device corresponding to the grouting hole located in an outermost row, the grouting pipe extends to a distance of ⅓ of an excavation process of the soft soil, in the segmented grouting device corresponding to the grouting holes in a middle row, the grouting pipe extends to a distance of ⅔ of the excavation process of the soft soil, in the segmented grouting device corresponding to an innermost row of the grouting holes, the grouting pipe extends to a distance of an entire excavation process of the soft soil, wherein the curtain grouting system injects slurry to the soft soil in sections in the weak strata simulation system through the grouting holes, wherein the working condition simulation system includes a high geothermal simulation system, a water pressure simulation system, and a three-dimensional confining pressure simulation system, the high geothermal simulation system heats the soft soil in the weak strata simulation system, the water pressure simulation system injects water into the soft soil in the simulation system, the three-dimensional confining pressure simulation system exerts pressure on the soft soil in the weak strata simulation system, and the monitoring and data acquisition system is used for monitoring and collecting relevant test parameters of the soft soil in the weak strata simulation system.

2 . The model test device according to claim 1 , wherein the weak strata simulation system consists of a grid frame on the slurry inlet surface, a grid frame on the slurry outlet surface, side steel grid frames, top steel grid frames, connecting steel parts, acrylic boards and a test platform, a number of side steel grid frames is two and are distributed on left and right sides, the grid frame on the slurry inlet surface, the grid frame on the slurry outlet surface, the side steel grid frame and the top steel grid frame are all steel grid frames welded by steel plates along vertical and horizontal directions, a bottom of the steel grid frame connects to the test platform by bolts,
wherein a number of the connecting steel parts is two, and are connected to top surfaces of the grid frame on the slurry inlet surface and the grid frame on the slurry outlet surface by the bolts respectively, and a left end and a right end of the connecting steel parts connect to the top surfaces of two side steel grid frames by the bolts, the top surface steel grid frame is placed on the soft soil, wherein a number of the acrylic boards is four, which are placed on inner sides of the grid frame on the slurry inlet surface, the grid frame on the slurry outlet surface, and the steel frames on the left and right sides, respectively, the acrylic board placed on the inner side of the grid frame on the slurry inlet surface is provided with arched excavation chambers and grouting holes, the acrylic board placed on a back side of the grid frame on the slurry outlet surface is provided with an arched excavation chamber, the acrylic boards placed behind the steel frames on the left and right sides are provided with water inlet holes, drainage holes and sensor data cable lead-out holes, respectively.

3 . The model test device according to claim 2 , wherein the curtain grouting system includes a high-pressure pumping pipe, a slurry air compressor, a grouting air pressure regulator, a grouting pump and a mixing tank, the high-pressure pumping pipe is connected to the mixing tank, the grouting pump and the grouting holes in the weak strata simulation system sequentially, the slurry air compressor connects to the grouting air pressure regulator.

4 . The model test device according to claim 3 , wherein the high geothermal simulation system includes several stainless-steel heating rods, and an adjustable temperature range of the stainless-steel heating rods is 35-90° C., the stainless-steel heating rods are fixed vertically on the inner surface of the side steel grid frame and is embedded in the soft soil.

5 . The model test device according to claim 4 , wherein the three-dimensional confining pressure simulation system includes a hydraulic station and multiple loading units, the loading units are distributed on top, left, right, front and rear of the weak strata simulation system, and each of the loading unit includes hydraulic cylinders and loading plates, the hydraulic cylinder is arranged on a steel grid frame, and the loading plate is buried in the soft soil in the weak strata simulation system, the hydraulic cylinders connect to the hydraulic station through hydraulic pipelines.

6 . The model test device according to claim 5 , wherein the monitoring and data acquisition system includes temperature sensors, grouting flow sensors, dynamic water flow sensors, grouting pressure sensors, dynamic water pressure sensors, strata pressure sensors, displacement sensors, high-definition cameras, paperless recorders, and a data analyzer, the temperature sensors are buried inside the weak strata simulation system, the grouting flow sensor connects to the curtain grouting system, the grouting pressure sensor is placed before the grouting flow sensor, the dynamic water flow sensor connects to a water pressure simulation system, the dynamic water pressure sensor is placed before the dynamic water flow sensor, the strata pressure sensors and displacement sensors are embedded in the weak strata simulation system filled up with soft soil, a total of two paperless recorders are located in the curtain grouting system parallel connecting to the grouting flow sensors, the grouting pressure sensors and the water pressure simulation system, the dynamic water flow sensors, and the dynamic water pressure sensors.

7 . The model test device according to claim 6 , wherein the connecting steel parts are formed by two vertically welding steel plates, and a fixed connecting piece with a plurality of triangular ribs arranged along the length direction evenly.

8 . The model test device according to claim 5 , wherein the connecting steel parts are formed by two vertically welding steel plates, and a fixed connecting piece with a plurality of triangular ribs arranged along the length direction evenly.

9 . The model test device according to claim 4 , wherein the connecting steel parts are formed by two vertically welding steel plates, and a fixed connecting piece with a plurality of triangular ribs arranged along the length direction evenly.

10 . A model test method for curtain grouting and excavation of tunnels in hig

Assignees

• Ocean Univ China

Inventors

• Sha Fei
• Gu Shijiu
• Chen Xuguang
• Xi Mingshuai
• Kong Hao
• Fan Rui
• Bu Meng
• Chen Liming
• Li Hang

Classifications

• E02D33/00

  Testing foundations or foundation structures (testing methods and apparatus, see the relevant subclasses of class G01; testing structures or apparatus as regards function, in general, G01M; testing or determining chemical or physical properties, in general G01N) · CPC title

• Y02E10/10

  Geothermal energy · CPC title

• E02D31/00

  Protective arrangements for foundations or foundation structures {(protective casings for piles E02D5/60)}; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution (spillage retaining means for tanks B65D90/24) · CPC title

• E21D9/003

  Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines · CPC title

• G09B25/00 Primary

  Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes (model vehicles, tracks therefor, models in the nature of toys A63H) · CPC title