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Research paper | Open Access

Distribution characteristics and the evolution law of excavation damage zone in the large-span transition section of high-speed railway tunnel based on microseismic monitoring

Ao Li1( ), Dingli Zhang2, Zhenyu Sun2, Jun Huang1, Fei Dong1
Urban Construction and Rail Transit Design Institute, JSTI Group, Nanjing, China
School of Civil Engineering, Beijing Jiaotong University, Beijing, China
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Abstract

Purpose

The microseismic monitoring technique has great advantages on identifying the location, extent and the mechanism of damage process occurring in rock mass. This study aims to analyze distribution characteristics and the evolution law of excavation damage zone of surrounding rock based on microseismic monitoring data.

Design/methodology/approach

In situ test using microseismic monitoring technique is carried out in the large-span transition tunnel of Badaling Great Wall Station of Beijing-Zhangjiakou high-speed railway. An intelligent microseismic monitoring system is built with symmetry monitoring point layout both on the mountain surface and inside the tunnel to achieve three-dimensional and all-round monitoring results.

Findings

Microseismic events can be divided into high density area, medium density area and low density area according to the density distribution of microseismic events. The positions where the cumulative distribution frequencies of microseismic events are 60 and 80% are identified as the boundaries between high and medium density areas and between medium and low density areas, respectively. The high density area of microseismic events is regarded as the high excavation damage zone of surrounding rock, which is affected by the grade of surrounding rock and the span of tunnel. The prediction formulas for the depth of high excavation damage zone of surrounding rock at different tunnel positions are given considering these two parameters. The scale of the average moment magnitude parameters of microseismic events is adopted to describe the damage degree of surrounding rock. The strong positive correlation and multistage characteristics between the depth of excavation damage zone and deformation of surrounding rock are revealed. Based on the depth of high excavation damage zone of surrounding rock, the prestressed anchor cable (rod) is designed, and the safety of anchor cable (rod) design parameters is verified by the deformation results of surrounding rock.

Originality/value

The research provides a new method to predict the surrounding rock damage zone of large-span tunnel and also provides a reference basis for design parameters of prestressed anchor cable (rod).

Keywords

High-speed railwayLarge-span tunnelExcavation damage zoneMicroseismic monitoring

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Railway Sciences
Volume 1 Issue 1,
July 2022
Pages 56-75
DOI: 10.1108/RS-04-2022-0006
Cite this article:
Li A, Zhang D, Sun Z, et al. Distribution characteristics and the evolution law of excavation damage zone in the large-span transition section of high-speed railway tunnel based on microseismic monitoring. Railway Sciences, 2022, 1(1): 56-75. https://doi.org/10.1108/RS-04-2022-0006

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Received: 01 February 2022
Revised: 12 March 2022
Accepted: 03 April 2022
Published: 02 May 2022
© Ao Li, Dingli Zhang, Zhenyu Sun, Jun Huang and Fei Dong. Published inRailway Sciences.

This article is published under the Creative Commons Attribution (CC BY 4.0) licence. Anyone may reproduce, distribute, translate and create derivative works of this article (for both commercial and non-commercial purposes), subject to full attribution to the original publication and authors. The full terms of this licence may be seen at http://creativecommons.org/licences/by/4.0/legalcode.
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