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Method for forecasting advanced geology for tunnel construction

A technology for advanced geological forecasting and tunnel construction, applied in geophysical surveying, instruments, and electromagnetic wave detection, etc., can solve problems such as high-resolution detection and accurate forecasting

Active Publication Date: 2008-08-27
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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Problems solved by technology

Its scope of application is becoming wider and wider, its interpretation level is getting higher and higher, and its technology is becoming more and more mature, but even so, these methods still cannot solve the high resolution of the spatial position of abnormal geological conditions in the deep underground and deep in the tunnel face. Rate Detection and Accurate Forecasting Problems

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  • Method for forecasting advanced geology for tunnel construction
  • Method for forecasting advanced geology for tunnel construction
  • Method for forecasting advanced geology for tunnel construction

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Embodiment Construction

[0011] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0012] figure 1 Shown is the process flow diagram of the present invention:

[0013] Step 1. First, judge the approximate location of the unfavorable geological body based on the preliminary analysis of the medium-term forecast results, and then judge the geological anomaly signal in front of the tunnel face according to the medium-term and short-term forecast results; Determine the specific location and depth of the probe;

[0014] TSP and land sonar methods can be used for medium-term forecasting, with a forecast distance of 80-120m; short-term forecasts can be used for transient electromagnetic, electrical, and surface radar methods, with a distance of 20-50m. The embodiment of the present invention uses surface radar for short-term forecasting. The face surface radar test is susceptible to external interference, and false anomalies of...

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Abstract

The invention relates to an advanced geological forecast method in the tunnel construction filed, comprising the following steps of: determining a hole prospecting proposal according to a middle or short term forecast and placing a radar antenna in after a hole is drilled to collect radar signals and determine whether any abnormal geologic body exists; if no geologic body exist, continuing construction; if geologic body exists, drilling again, placing a radar antenna in so as to collect signal and determine whether any abnormal geologic body exists; if no geologic body exist, continuing construction; if geologic body exists, drilling again and placing a radar antenna in so as to collect signals. Describing the spatial positions of the abnormal geologic bodies according to the signals obtained during the three times so as to provide operational geologic information for further processing. The advanced geological forecast method can be used in a wide exploration scope, can accurately forecast the abnormal spatial geologic phenomenon in front of an excavating face, provides reliable assurance for reducing collapse and rapid construction, is applicable to exploration of high resolution at deep underground and deep tunnel excavating face and is an uniquely feasible and effective exploration means to deep engineering in many cases.

Description

technical field [0001] The invention relates to an advanced geological prediction method in the field of tunnel construction. Background technique [0002] In the construction of railways and highways, tunnels with a depth of more than hundreds of meters and a length of several kilometers or tens of kilometers are often encountered. Although the corresponding geological survey work has been done in the preliminary survey and design process, it also has certain guiding significance for construction. However, due to the complexity of the rock mass, there may be large discrepancies between the data obtained from the survey and the actual situation revealed after the tunnel excavation. Tunnel construction has a lot of blindness, and accidents such as landslides, roof falls, and water gushes often occur unexpectedly during construction. Once these accidents happen, it will affect the construction period and increase the project investment, and it will destroy the mechanical equi...

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Application Information

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IPC IPC(8): G01V3/12G01V3/00
Inventor 杨家松叶勇楼加丁谭天元张伟杨振中邱强廖建东张志
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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