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Method for detecting spherical boulders in shield construction

A detection method and technology in construction, applied in electric/magnetic exploration, geophysical measurement, electromagnetic wave detection, etc., can solve the problems of high cost and immature technology of three-dimensional detection

Active Publication Date: 2014-07-09
SHENZHEN MUNICIPAL ENG
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Problems solved by technology

Although the cross-hole ultra-high-density electrical method and cross-hole seismic CT can achieve good results, their detection range is only 2D sections, and the cost of 3D detection is high and the technology is not yet mature.

Method used

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  • Method for detecting spherical boulders in shield construction
  • Method for detecting spherical boulders in shield construction
  • Method for detecting spherical boulders in shield construction

Examples

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Embodiment 1

[0120] Embodiment 1, in order to detect the occurrence of spherical boulders in the shield tunnel interval, the method of the present invention is used in a geological reconnaissance area of ​​Shenzhen Metro Line 9, and the geological radar in the well and the cross-hole ultra-high density electrical method are used together. Survey and survey areas where boulders may be present. The specific steps are:

[0121] 1. The layout of drilling holes is as follows: figure 1 As shown, the geological conditions around the hole wall are detected by the geological radar in the well, and the collected geological radar echo signals along the depth direction of the borehole are used for data processing, and the i=300th track data is selected as an example, as shown in Figure 6-1 shown.

[0122] 1. Zero time adjustment, the take-off time t of the signal with the largest amplitude waveform on the echo signal 0 =4ns is used as the zero time point, and the data above the zero time point is ...

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Abstract

The invention discloses a method for detecting spherical boulders in shield construction to achieve the technical purpose of improving the capability of detecting the spherical boulders in the shield district. The method comprises the step of collecting geological radar echo signals in the drilling depth direction through a well geological radar, the step of primarily defining the dimensional orientation where the spherical boulders probably exist, the step of collecting potential differences and currents between two drill holes to obtain the true resistivity of a stratum between the two holes, the step of drawing the true resistivity into a contour map to define the sizes and the distribution situation of the spherical boulders in the stratum between the two holes. Compared with the prior art, the well geological radar and the hole crossing ultrahigh precision electrical method are utilized, the spherical boulders within the shield tunnel range is detected, the distribution of the spherical boulders within the tunnel range can be detected to the maximum degree, the number of the drill holes can be reduced, the detecting cost is small, meanwhile, the probability of finding the spherical boulders in the complex stratum shield district is improved, and the smooth advancing of a shield tunneling machine is guaranteed.

Description

technical field [0001] The invention relates to a geological survey method for tunnel construction, in particular to a method for detecting the distribution of spherical boulders in a shield section. Background technique [0002] The detection of spherical boulders in medium and slightly weathered granite is a key problem to be solved urgently in the construction of subway shield tunnels. The geological survey methods used in the prior art for the detection of granite spherical boulders mainly include core drilling and engineering geophysical prospecting. Among them, the core sampling method is the most direct, and is often used as the most important geological exploration method in the subway design stage. However, drill core sampling is only a "one-hole view", which can only reflect the distribution of spherical boulders in a limited range around the borehole and its surroundings, and the information of spherical boulders revealed by core sampling is very limited. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/12G01V3/02G01S13/08
Inventor 龙桂华江建苏军陈智斌刘铁军胡巍
Owner SHENZHEN MUNICIPAL ENG
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