深埋引水隧洞塌方孕育过程微震规律研究：以Neelum-Jhelum工程为例

doi:10.13722/j.cnki.jrme.2017.1618

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Abstract

Complex geological condition and excavation in deep tunnel frequently led to collapse accidents，which seriously threatened the safety of life and property of workers on site. In order to reduce the impact of collapse on the Neelum-Jhelum project in Pakistan，a microseismic monitoring system was constructed to study the temporal and spatial evolution law of the microseismic activity during the development of collapse. The research showed that，when the working face was gradually approaching but didn′t reveal rock mass in the collapse zone，fewer microseismic events occurred，and the cumulative released energy increased rapidly. The cumulative apparent volume grew slowly and the energy index was basically stable after sudden increase. As rock mass in the collapse zone being revealed by excavation，more microseismic events occurred. The cumulative released energy increased slowly，the cumulative apparent volume sharply increased，and the energy index suddenly decreased. Microseismic events clustered in a certain part of collapse zone，where an interface filled with calcite developed. Most of the microseismic events occurred within the 3 times of the tunnel radius from the cavern wall in surrounding rock. The mechanism of rock cracks in the collapse zone was “shearing at the first and tensioning in the end”. The development of collapse showed obvious stage characteristics：the interface filled with calcite slide→parallel tensile cracks occurred in surrounding rock after revealed→The cantilever rock beam cracked on the end→The cracks penetrated and the rock blocks fell by gravity.

Key words： rock mechanics deep tunnel collapse microseismic monitoring evolution law Neelum-Jhelum project

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1618 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4115

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