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Method for judging grade of tunnel surrounding rock based on magnetotelluric sounding resistivity

A technology of magnetotelluric sounding and surrounding rock grading, applied in the field of geological exploration and construction, can solve problems such as large errors and large human factors, achieve reliable grading of surrounding rock, strong applicability and quantification, and overcome the effect of continuous calculation.

Pending Publication Date: 2020-04-07
CHINA RAILWAY DESIGN GRP CO LTD
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Problems solved by technology

This method has a large human factor and a large error

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  • Method for judging grade of tunnel surrounding rock based on magnetotelluric sounding resistivity
  • Method for judging grade of tunnel surrounding rock based on magnetotelluric sounding resistivity
  • Method for judging grade of tunnel surrounding rock based on magnetotelluric sounding resistivity

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Embodiment Construction

[0026] The present invention will be further described in detail through the accompanying drawings and specific embodiments below.

[0027] The invention provides a method for judging the grade of the surrounding rock of a tunnel based on the resistivity of the magnetotelluric sounding. A data model is established according to the known resistivity value of a certain area and samples of the grade of the surrounding rock of the tunnel. Data and extract the resistivity value, and obtain the tunnel surrounding rock grade through the established data model.

[0028] In this embodiment, taking the completed tunnels in Northeast China as an example, the grade values ​​of the tunnel surrounding rocks are counted, the corresponding magnetotelluric data in this area are collected, and the resistivity of the cave is extracted by using MapGen software. There are 8 kinds of rocks in this statistics. There are 21055 sample points, and the obvious abnormal points will be removed in the stat...

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Abstract

The invention discloses a method for judging the grade of tunnel surrounding rock based on magnetotelluric sounding resistivity. The method comprises the following steps: (1), building a correspondingrelation model of the grade of tunnel surrounding rock and a resistivity interval according to a tunnel surrounding rock grade and a tunnel body resistivity value sample of a known region; (2) acquiring a resistivity value of a to-be-graded region; and (3) obtaining the tunnel surrounding rock grade of the to-be-graded area according to the resistivity of the to-be-graded area obtained in the step (2) and the corresponding relation model between the tunnel surrounding rock grade and the resistivity interval established in the step (1). The technical scheme has high applicability and quantification, overcomes the error problem of field investigation and manual judgment, overcomes the defect that continuous calculation cannot be performed when the wave velocity of the drilled hole is determined, overcomes the difficulty in solving the seismic wave velocity, can judge the surrounding rock grade according to the geodetic sounding resistivity, and provides a reliable basis for surroundingrock grading for tunnel design.

Description

technical field [0001] The invention relates to a method for judging the grade of surrounding rock of a tunnel based on the resistivity of magnetotelluric sounding, which belongs to the technical field of geological exploration and construction, and in particular relates to the field of methods for classifying the surrounding rock of railway tunnels. Background technique [0002] In recent years, with the development of high-speed railways, there are more and more railway constructions in complex areas, so more and more tunnel design work, the classification of tunnel surrounding rock is the most important basis for tunnel design. Tunnels with different grades of surrounding rock have great differences in project cost, and inaccurate grades of surrounding rock may lead to a gap in the project budget and make the project unable to proceed smoothly. Different grades of surrounding rock require different construction techniques, and inaccurate judgment of the grade of surroundi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G01V3/38
CPCG06F17/18G01V3/38
Inventor 许广春秦海旭祁晓雨刘英牛永效
Owner CHINA RAILWAY DESIGN GRP CO LTD
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