Tunnel construction large-scale integrated geophysical advanced detection model test device

Patent metadata

Field	Value
Publication number	US-9989671-B2
Application number	US-201414397547-A
Country	US
Kind code	B2
Filing date	Jan 26, 2014
Priority date	Jan 7, 2014
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

The present invention presents a tunnel construction large-scale integrated geophysical advanced detection model test device. The model test device includes a tunnel surrounding rock, a main tunnel model, a model test case, a water-containing geological structure device, a numerical control automated construction device and a main control chamber. The model test device is a large-scale integrated geophysical advanced detection model test device meeting the detection using a seismic wave method, an electromagnetic method and a direct-current electric method. By using the geophysical advanced detection model test device, the geophysical response features of the water-containing geological structure device in front of a tunnel face may be studied, multiple geophysical advanced detection forward and inversion methods for the water-containing geological structure device are verified, and the relationship between some geophysical detection method results and water burst quantity is studied, for the advanced prediction and water burst quantity prediction in actual engineering.

First claim

The invention claimed is:

1. A tunnel construction large-scale integrated geophysical advanced detection model test device, comprising a tunnel surrounding rock, a main tunnel model, a model test case having a front and a top, a water-containing geological structure device, a numerical control automated construction device, horizontal detection boreholes and a main control chamber, wherein the tunnel surrounding rock is filled in the model test case, the main tunnel model of a model test is positioned in the middle of the front of the model test case, the water-containing geological structure device is arranged in front of the main tunnel model, the numerical control automated construction device is mounted on the top of the model test case, the horizontal detection boreholes are arranged in the model test device, and the main control chamber is positioned outside the model test case and communicates with the water-containing geological structure device and the numerical control automated construction device;
the tunnel surrounding rock is used for simulating the condition of the tunnel surrounding rock in actual tunnel construction and is a similar material simultaneously meeting the requirements of seismic wave field, electromagnetic field and direct-current electric field detection for resistivity and wave velocity, and the similar material is formed by mixing and compacting the following components in parts by mass:

soil
100
parts

cement
4-20
parts

gravel
10-25
parts,

wherein water ratio of the soil is controlled to be 8-16%, and compactness of the whole similar material is controlled to be 0.75-0.95; the soil and the gravel are aggregates of the similar material, the cement is a cementing agent, the gravel is 3-4 meshes, and the cement is directly mixed as dry powder; and the wave velocity of the similar material is 230-1,260 m/s, and resistivity of the similar material is 20-340 Ωm.

2. An integrated geophysical advanced detection method using the detection model test device of claim 1 , comprising the following detection steps:
(1) pre-burying of a geological abnormal body: after the three-dimensional position of the pre-buried geological abnormal body in the model test is determined, performing quick three-dimensional positioning excavation in the tunnel surrounding rock by using the numerical control automated construction device, carrying and burying the water-containing geological structure device to a predefined position in front of the main tunnel model, and backfilling and ramming the tunnel surrounding rock;
(2) connection of detection devices and detection test, specifically comprising:
1) selection of a detection method and connection of devices: selecting a detection method according to the test requirement, the detection method including an induced polarization method, a transient electromagnetic method, a seismic wave method, a borehole radar method and a resistivity CT method, and connecting the detection devices matched with the detection method for the geophysical advanced detection test;
2) selection of electrodes and horizontal detection boreholes: selecting the electrodes or the horizontal detection boreholes required for the corresponding method according to the selected detection method, wherein the induced polarization method needs the electrodes arranged on the main tunnel face and the tunnel cavity, and the borehole radar method and the resistivity CT method need two random boreholes selected according to the three-dimensional position of the pre-buried water-containing geological structure device, so as to ensure that the water-containing geological structure device is positioned between the horizontal detection boreholes;
3) detection and verification of detection results: performing various geophysical advanced detections under the coordination action of the detection devices and the electrodes or the boreholes, performing geophysical inversion on the acquired detection data to obtain response results of the water-containing geological structure device so as to obtain information including the three-dimensional position and size of the detected water-containing geological structure device, and verify the information with three-dimensional position and size of the actual buried water-containing geological structure device to judge the accuracy of various detection methods.

3. The tunnel construction large-scale integrated geophysical advanced detection model test device of claim 1 , wherein the model test case has a reinforced concrete structure, the geometrical factor ratio G of the whole model test device is 6, and the geometrical factor ratio is the geometrical dimension ratio of a prototype to a model.

4. The tunnel construction large-scale integrated geophysical advanced detection model test device of claim 1 , wherein there are totally three pairs of horizontal detection boreholes, one pair of boreholes is positioned in front of the main tunnel face and used for mounting of a transient electromagnetic method advanced probe, mounting of a resistivity CT method electrode and delivery of a borehole radar method antenna, and the other two pairs of boreholes in which measuring electrodes are mounted penetrate through the whole model test device and are respectively positioned at upper left, upper right, lower left and lower right parts of the model test device and used for detection of a resistivity CT method and a borehole radar method.

5. The tunnel construction large-scale integrated geophysical advanced detection model test device of claim 1 , wherein the main control chamber is used for controlling and displaying each operation in the test, and communicates with the water-containing geological structure device and the numerical control automated construction device.

6. The tunnel construction large-scale integrated geophysical advanced detection model test device of claim 1 , wherein a preparation method of the tunnel surrounding rock comprises the following steps:
(1) finding out the values of appropriate water ratio and compactness according to the resistivity and wave velocity parameters of required materials and the relationship curve among the wave velocity, resistivity, water ratio and compactness;
(2) excavating a plurality of underground soil samples, drying, exposing in the sun or adding water to ensure that the water ratio of the soil reaches the predefined water ratio, and sieving out a plurality of gravel with the diameters of 3-4 meshes through a sieve;
(3) respectively weighing the raw materials, putting the raw materials into a stirrer and fully stirring the raw materials;
(4) putting the mixed material into a model, stacking layer by layer, and performing artificial ramming to reach the predefined compactness.

7. The tunnel construction large-scale integrated geophysical advanced detection model test device of claim 1 , wherein the main tunnel model comprises a tunnel model face and a tunnel model cavity which are connected with each other to form a whole; the tunnel model cavity is divided into an inner

Assignees

• Univ Shandong

Inventors

• Li Shucai
• Liu Bin
• Nie Lichao
• Xu Lei
• Ma Xiangxue
• Wang Chuanwu
• Liu Zhengyu
• Song Jie
• Sun Huaifeng
• Xu Xinji
• Li Yao

Classifications

• G01V11/00 Primary

  Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00 · CPC title

• G01V3/165

  operating with magnetic or electric fields produced or modified by the object or by the detecting device (with electromagnetic waves G01V3/17) · CPC title

• G01V1/30

  Analysis (G01V1/50 takes precedence) · CPC title

• G01V99/005 Primary

  Physics · mapped topic

• G01V3/17

  operating with electromagnetic waves {(operating with millimetre waves G01V8/005)} · CPC title