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A time-space early warning method for time-delay rockburst in tunnel construction

A rockburst and tunnel technology, which is applied in the field of time-space early warning of time-delay type rockburst in tunnel construction, can solve the problems of microseismic positioning accuracy error, inability to provide specific time of rockburst, etc.

Active Publication Date: 2020-11-24
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, microseismic monitoring still has certain limitations. Due to uneven engineering geological conditions, there is a certain error in the positioning accuracy of microseismic. This monitoring method can only give the approximate location, but cannot provide the specific time when the rockburst occurred.

Method used

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  • A time-space early warning method for time-delay rockburst in tunnel construction
  • A time-space early warning method for time-delay rockburst in tunnel construction
  • A time-space early warning method for time-delay rockburst in tunnel construction

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Embodiment Construction

[0037] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the examples. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0038] A space-time early warning method for time-delayed rockburst in tunnel construction, comprising the following steps:

[0039] Step 1. Firstly, microseismic sensors 7 are arranged on the first section (section I-I) and the second section (section II-II) at different distances from the tunnel face in the tunnel under construction, such as figure 1 As shown, the distance between the first section and the second section is 30-50m, the distance from the first section to the face 3 is 50-80m, and the first section is closer to the face than the second section; A total of 4 micros...

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Abstract

The invention discloses a space-time early warning method against time lag type rockburst in tunnel construction. Arrangement is made in a construction tunnel; a micro-seismic event is positioned according to data thereof, and a rockburst risk area and a pile number range corresponding to the same are obtained; stress sensors are arranged in the rockburst risk area; and a micro-seismic event energy index EI and a micro-seismic event apparent volume VA of the rockburst risk area position and a curve graph in which the stress sigma of the stress sensors evolves with time are obtained, and occurrence position and time of rockburst are analyzed and determined. According to the invention, the rockburst occurrence position and time can be warned early accurately.

Description

technical field [0001] The invention relates to the field of rockburst early warning in geotechnical engineering, and more particularly relates to a time-delay rockburst early warning method for tunnel construction. [0002] technical background [0003] With the rapid development of the national economy, large-scale projects such as the development of hydropower resources and the construction of railways and highways are advancing at an unprecedented speed; more and more deep-buried tunnel projects, and with the increase of depth, the geological environment of rock mass occurrence is getting worse. The rockburst disasters caused by excavation become more serious, prominent and frequent. Large-scale projects such as the diversion tunnel of the Jinping II Hydropower Station, the Han-to-Wei project in Shaanxi Province, the Sichuan-Tibet Railway, and the NJ Hydropower Diversion Tunnel in Pakistan all encountered strong rockbursts, seriously affecting the safety of operators and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/00G01H1/12G01L5/00G01S5/00G01S5/18
CPCG01H1/12G01L5/0028G01S5/00G01S5/18G01V1/001
Inventor 陈炳瑞朱新豪王旭李涛魏凡博
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI