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Experimental system and method for simulating seepage change in tunnel excavation under complex geological conditions

A technology for complex geological conditions and tunnel excavation, applied in the field of geotechnical engineering, it can solve the problems of single hydraulic loading form, the inability to directly observe and study the stress-seepage phenomenon, and the single test function.

Active Publication Date: 2022-07-29
SHANDONG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventors found that in the water inrush disasters induced by the damage of water-resisting rock mass, whether it is the mechanism of water inrush disaster or the study of advanced forecasting, prediction theory, evaluation and early warning, and disaster management, all involve the gradual failure of tunnel water inrush and water-resisting rock mass The stress-seepage phenomenon in the process, due to the increasingly complex geological conditions of the tunnel, the actual stress-seepage phenomenon cannot be directly observed and studied, but through the simulation test, the stress-seepage phenomenon can be deeply understood. The test device for excavation seepage change has obvious limitations in terms of single test function, single hydraulic loading form, and poor sealing of the test box.

Method used

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  • Experimental system and method for simulating seepage change in tunnel excavation under complex geological conditions
  • Experimental system and method for simulating seepage change in tunnel excavation under complex geological conditions
  • Experimental system and method for simulating seepage change in tunnel excavation under complex geological conditions

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example 1

[0084] refer to Figure 14(a)-Figure 14(c) As shown, the seepage field of surrounding rock under different seepage pressures is simulated. Pressure sensors 36 and / or osmotic pressure sensors 37 are arranged in different sections of the box, for example, a plurality of osmotic pressure sensors are arranged in section a, at least two pressure sensors are arranged in section b, and a plurality of pressure sensors are arranged in the transverse centerline of section a For the osmotic pressure sensor, multiple osmotic pressure sensors are set on the vertical center line, and four osmotic pressure sensors are set on the circle with the center of the box as the center (the osmotic pressure sensor is also set at the center of the circle), and the radius is set; section b Two pressure sensors are arranged on the central transverse centerline, the pressure sensor 36 is used to monitor the loading condition of in-situ stress, and the seepage pressure sensor 37 is used to monitor the chan...

example 2

[0087] As shown in Fig. 15(a) and Fig. 15(b), the seepage evolution of surrounding rock during tunnel excavation is simulated. The osmotic pressure sensor 37 and the pressure sensor 36 are arranged alternately up and down on different sections of the test material. The pressure sensor 36 is used to monitor the loading of in-situ stress, and the osmotic pressure sensor 37 is used to monitor the change of seepage pressure in the model body. The water pressure is simulated by inserting the hollow plugs 9 into the left and rear box holes 18. The water pressure of the water-containing structure is provided by the osmotic pressure loading unit 3, and the tunnel excavation is realized through the front box holes 18. By analyzing the data collected by the seepage pressure sensor 37 and the pressure sensor, the stress-seepage evolution law of the surrounding rock during the tunnel excavation process is analyzed.

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Abstract

The invention discloses a test system and method for simulating the seepage change of tunnel excavation under complex geological conditions, and solves the problem of no test device for simulating the evolution law of surrounding rock seepage under the influence of tunnel excavation in the prior art. Beneficial effect of the change of groundwater seepage field in water-resistant rock body under the action of excavation disturbance and high-pressure seepage. The specific scheme is as follows: A test system for simulating the change of seepage flow in tunnel excavation under complex geological conditions, including a test box, and in-situ stress is set on the top of the test box Loading unit, test pieces can be set inside the test box, and holes are set on each side of the circumference of the test box, some of which are used as the simulation of tunnel excavation holes, and some holes are provided with plugs or hollow plugs, and the side of the test box is A water filling tank is arranged, the water filling tank is communicated with the water inlet hole provided in the box body, and the hollow plug and the water filling tank are respectively communicated with the osmotic pressure loading unit.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a test system and method for simulating changes in tunnel excavation seepage under complex geological conditions. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The center of construction of major national projects has shifted to the southwestern mountainous areas and strong karst areas with extremely complex topographic and geological conditions. These tunnel projects generally have remarkable characteristics such as large burial depth, long tunnel lines, and complex hydrogeological conditions. In addition, the geological exploration work in the early stage of construction is difficult to find out the hydrogeological conditions along the tunnel, resulting in many geological disasters during the tunnel construction, such as rock bursts,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G09B23/40
CPCG01N15/0826G09B23/40
Inventor 薛翊国李志强公惠民周炳桦马啸寅孔凡猛傅康
Owner SHANDONG UNIV
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