Early-warning method of rock collapse and its experimental verification

被引：0

作者：

Du Y. ^{[1
,2
]}

Wu Z. ^{[1
,2
]}

Xie M. ^{[1
,2
]}

Liu R. ^{[3
]}

Chen C. ^{[2
]}

机构：

[1] Beijing Key Laboratory of Urban Underground Space Engineering, University of Science & Technology Beijing, Beijing

[2] School of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing

[3] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou

来源：

Meitan Xuebao/Journal of the China Coal Society | 2019年 / 44卷 / 10期

关键词：

Early warning; Failure precursor in accelerated failure phase; Failure precursor in separation phase; Rock block collapse; Vibration characteristics;

D O I：

10.13225/j.cnki.jccs.2018.1467

中图分类号：

学科分类号：

摘要：

Early warning of rock collapse has been one of the frontier problems in the study of geological hazards for many years. The traditional monitoring methods pay more attention to failure phase, and it is difficult to realize the early warning of brittle failure such as rock collapse. In fact, the collapse generally undergoes two phases, which are separation phase and failure phase. Focusing on the precursory events of the separation phase can quickly alert the public in time to seek shelter before a devastating rock collapse. Based on the Laser Doppler vibration testing technology and new physical model experiment, the study focused on the identification of failure precursors of unstable rock in the separation phase. In this experiment, a new freezing experiment method was adopted to simulate the continuous decrease of the bond strength of rock block, and the stability of the block continued to decrease as time went by, and finally broke down at 117 s. The monitoring results showed that the separation precursor occurred at 50 s and the accelerated failure precursor occurred at 115 s, respectively. The early warning based on the identification of failure precursor in the separation phase was triggered 67 seconds before the destruction, while the early warning based on the identification of failure precursor in the accelerated failure phase was 2 seconds. Compared with the traditional early-warning idea based on the recognition of failure precursor, the early-warning method based on the separation failure precursor used for early warning of rock block collapse created 65 s in advance, which has better timeliness and can effectively be used as "golden period" of early warning to buy time for better coping with collapse disasters in the projects. The idea of early warning of rock mass collapse disaster based on separation failure precursor recognition is the development direction of emergency prevention of brittle failure disasters such as rock mass collapse of high and steep slopes in mines. © 2019, Editorial Office of Journal of China Coal Society. All right reserved.

引用

页码：3069 / 3075

页数：6

共 22 条

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