Advance geology forecast method of nearly omnibearing resistivity tunnel

A technology of advanced geological forecasting and resistivity, applied in electric/magnetic exploration, geophysical measurement, radio wave measurement system, etc., can solve problems such as disasters, endanger the safety of tunnel operation, hidden dangers of tunnel safety, etc. The effect of large range and reduced error rate

Active Publication Date: 2017-05-31
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the current advanced tunnel forecasting methods only predict a relatively narrow space in front of the tunnel face. If there is bad geology within the scope, this is definitely a hidden danger to the safety of the t

Method used

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  • Advance geology forecast method of nearly omnibearing resistivity tunnel
  • Advance geology forecast method of nearly omnibearing resistivity tunnel
  • Advance geology forecast method of nearly omnibearing resistivity tunnel

Examples

Experimental program
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Embodiment 1

[0034] (1) Select three parallel survey lines in the tunnel, survey line 1 (1), survey line 2 (2), survey line 3 (3), with the direction facing the tunnel face (7) as the positive direction , measuring line 1(1) is on the left side of the tunnel floor, measuring line 2(2) is on the top of the vault of the tunnel (it can also be in the middle of the floor, but it is best placed on the vault), and measuring line 3(3) is in the tunnel On the right side of the base plate, each measuring line is fixed with the power supply electrode A as the point power supply (4), and the point power supply A (4) of the three measuring lines is required to be close to the palm surface (7), and the B pole is placed relatively infinity .

[0035] (2) First, measure the measuring line 1(1). Under the premise of keeping the distance between the measuring electrodes M(5) and N(6) unchanged, the electrodes M(5) and N(6) are kept away from the point power supply A(4 ) direction, (away from the face (7) ...

Embodiment 2

[0044](1) Select three parallel survey lines in tunnels with complex geological conditions, survey line 1 (1), survey line 2 (2), survey line 3 (3), to face the tunnel face (7) The direction is the positive direction, the measuring line 1 (1) is on the left side of the bottom plate of the tunnel, the measuring line 2 (2) is on the top of the vault of the tunnel (it can also be in the middle of the bottom plate, but it is best placed on the vault), and the measuring line 3 (3) On the right side of the bottom plate of the tunnel, each measuring line is fixed with the power supply electrode A as the point power supply (4). at relative infinity.

[0045] (2) First, measure the measuring line 1(1). Under the premise of keeping the distance between the measuring electrodes M(5) and N(6) unchanged, the electrodes M(5) and N(6) are kept away from the point power supply A(4 ) direction, (away from the palm face (7) direction) at the same time move the same distance (also known as poin...

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Abstract

The invention discloses an advance geology forecast method of a nearly omnibearing resistivity tunnel. The advance geology forecast method of the nearly omnibearing resistivity tunnel comprises the following steps: selecting a plurality of measuring lines which are parallel to one another in the tunnel, wherein a power supply electrode A is fixed on each measuring line and is used as a point power supply, the point power supplies A of the three measuring lines are required to be closely attached to a tunnel face, and a pole B is placed at a position which is relatively infinitely far from the measuring lines; measuring the measuring lines successively, and acquiring measurement of potential difference among measuring electrodes of a plurality of measuring points; calculating each apparent resistivity value according to measured potential, labeling measuring point positions corresponding to the apparent resistivity values, acquiring an apparent resistivity-polar distance curvilinear relationship, and carrying out depth sounding inversion on the positions corresponding to the measuring points of which the apparent resistivity values are changed obviously to obtain a true resistivity-depth map; and determining the depth in the true resistivity-depth map, drawing up an isobathic circle by taking the point power supply of each measuring line as a center of a circle and taking the depth of a radius, and determining the common point of intersection of the isobathic circles of the measuring lines as an accurate position of an unfavorable geologic body. The advance geology forecast method has the advantages of simplicity in field operation, high efficiency, good effect and the like.

Description

technical field [0001] The invention relates to the field of advanced geological prediction of tunnels, in particular to a method for advanced geological prediction of near-omnidirectional resistivity tunnels. Background technique [0002] With the development of society, there are more and more tunnel projects, and people pay more and more attention to the safety of tunnel construction. Tunnel advanced geological prediction is essential in the process of tunnel construction. It can help construction personnel understand the geological conditions of the tunnel construction direction, so as to determine the construction method and ensure the safety and efficiency of tunnel construction. However, in the process of tunnel construction, sometimes even though corresponding advanced forecasts are carried out, due to the complexity of the geological conditions in front of the tunnel face, disasters and accidents will still occur, such as water inrush, mud inrush and landslides. Th...

Claims

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Application Information

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IPC IPC(8): G01V3/00G01V3/38
CPCG01V3/00G01V3/38
Inventor 李术才苏茂鑫薛翊国邱道宏夏腾张开
Owner SHANDONG UNIV
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