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Underground construction advanced detection method and system based on resistivity of multiple same source electrode arrays

An underground engineering and electrode array technology, which is applied in radio wave measurement systems, electric/magnetic exploration, geophysical measurement, etc., can solve the problems of sensitive response, interference, and low resolution, and increase the detection distance and sensitivity Improve, improve the effect of spatial resolution

Active Publication Date: 2014-03-19
山东百廿慧通工程科技有限公司
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AI Technical Summary

Problems solved by technology

[0004] This method mainly faces the following problems: ①Since the measurement electrode MN moves behind the tunnel face, it is easily disturbed by abnormal objects behind the tunnel face; ②Due to the special environment of the tunnel, the detection mode of the tunnel three-pole method is perpendicular to the Abnormal body, resulting in sensitive response to abnormal body near the face, relatively insensitive to remote abnormal body response, and power supply and reception belong to one-dimensional detection mode, the resolution is not high

Method used

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  • Underground construction advanced detection method and system based on resistivity of multiple same source electrode arrays
  • Underground construction advanced detection method and system based on resistivity of multiple same source electrode arrays
  • Underground construction advanced detection method and system based on resistivity of multiple same source electrode arrays

Examples

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Effect test

Embodiment 1

[0042] Taking a certain tunnel as an example, the section of the tunnel is arched, the span is 12m and the height is 8m. There is water gushing near the mileage ZK97+853, and there may be a water-bearing structure in front. The resistivity method of the homogeneous source electrode array is used for advanced detection. The specific working method is as follows: figure 2 Shown:

[0043] (1) Arrange 3 parallel measuring lines L on the tunnel face 1 , L 2 and L 3 , respectively arranged at heights of 3m, 6m and 9m from the bottom plate, the number of measuring electrodes M on each measuring line is 13, forming an array measuring electrode system;

[0044] (2) Arrange 4 power supply electrodes A evenly on the periphery of the array measuring electrode system along the contour line of the tunnel face, and then arrange 4 measuring lines on the side wall starting from these 4 power supply electrodes A, each measuring line The number of power supply electrodes A on the top is 5,...

Embodiment 2

[0051] Taking a certain tunnel as an example, the section of the tunnel is arched, the span is 12m, and the height is 8m. Water gushes near the mileage ZK97+853. Repeat the test steps (1) to (5). The 3D imaging results of this detection are as follows: Figure 4 As shown, the surrounding rocks in the ZK97+871~ZK97+875 section are relatively rich in water.

Embodiment 3

[0053] Taking a certain tunnel as an example, the section of the tunnel is arched, the span is 12m, and the height is 8m. Water gushes near the mileage ZK97+853. Repeat the test steps (1) to (5). The 3D imaging results of this detection are as follows: Figure 5 As shown, the surrounding rocks in the ZK97+874~ZK97+875 section are relatively rich in water.

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Abstract

The invention relates to an underground construction advanced detection method and system based on resistivity of multiple same source electrode arrays. The underground construction advanced detection method and system is suitable for detection of unfavorable geology in a borehole-blasting method of underground construction including tunnels or underground tunnels or the construction process of a tunnel boring machine (TBM). The underground construction advanced detection method comprises the steps of (1) constructing an array type measurement electrode system on a working surface; (2) forming a power supply electrode system on a side wall, and arranging the other power supply electrode B and measurement electrodes N to the position far away behind the working surface; (3) providing positive and negative current through a power supply electrode A positioned on the working surface and the power supply electrode B positioned far away behind the working surface, utilizing each of measurement electrodes M in the array type measurement electrode system to measure electric potential respectively, and obtaining the electric potential difference of the measurement electrodes M and the measurement electrodes N in the working surface and fracture surfaces, wherein the step is repeated continuously until the power supply electrode system moves to the preset position, and the detection is completed; (4) performing inversion on the measured electric potential difference data by adopting least square linear inversion iteration process based on smooth constraint to obtain three-dimensional resistivity images of a geologic body in front of the working surface.

Description

technical field [0001] The invention relates to a drilling and blasting method for underground engineering such as tunnels or tunnels or a detection method for unfavorable geology during TBM construction, and in particular to an advanced detection method and system for underground engineering based on the resistivity of polyhomogeneous source electrode arrays. Background technique [0002] As the construction focus of water conservancy and hydropower projects and transportation projects gradually shifts to the western mountainous areas and karst areas with extremely complex terrain and geological conditions, the engineering geological conditions encountered are extremely complex, and the construction is faced with many high-risk geological conditions such as water inrush and mud inrush. disaster. Water inrush disasters have brought major disasters and loss of life and property to construction safety, and it is an effective way to avoid and prevent major disasters by ascertai...

Claims

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Application Information

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IPC IPC(8): G01V3/06
Inventor 刘斌李术才聂利超杨为民王传武田明禛陈磊宋杰刘征宇李树忱王世睿李尧
Owner 山东百廿慧通工程科技有限公司
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