白鹤滩水电站左岸边坡开挖卸荷过程微震视应力特征研究

doi:10.13722/j.cnki.jrme.2017.0748

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摘要

微震事件视应力可反映岩质边坡应力变化情况。以白鹤滩水电站左岸边坡为研究背景，分析岩质边坡爆破开挖卸荷过程微震视应力与能量、地震矩的关系，重点研究微震视应力在爆破开挖前后变化特征，结合数值模拟，通过微震视应力变化情况开展边坡稳定性评价。研究结果表明：微震视应力随地震矩和辐射能量的增大而增大；高视应力微震事件的出现可反映工程施工中的强烈爆破开挖扰动程度；通过微震视应力分布特征圈定的主要损伤区与RFPA^3D数值模拟结果基本吻合；视应力急剧下降，累积视体积呈增长趋势，是边坡围岩变形的前兆信号。研究成果可为基于微震监测的类似大型岩石边坡稳定性评价提供参考。

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	张敏1
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	徐奴文1
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	陈文夫3
	谭尧升3
	戴峰1
	蒋雄1
	李韬1

关键词 ：岩石力学, 边坡稳定, 视应力, 微震监测, 视体积, 白鹤滩水电站

Abstract：

Blasting excavation of the rock slope produces geometry changes which will induce stress redistribution within the rock mass. The stress redistribution can be reflected by the apparent stress of micoseismic(MS) events. The apparent stress of MS events increases along with the seismic moment and radiated energy. High apparent stress in rock mass can reflect the disturbance degree subjected to intense blasting excavation. The distribution characteristics of high MS apparent stress in the left bank slope can delineate the main damage regions，which is in good agreement with the result of numerical simulation using the Realistic Failure Process Analysis code in three-dimension(RFPA^3D). The period that the average daily apparent stress reduces strongly and the cumulative apparent volume increases can be regarded as the precursor of the deformation of rock slope. The present achievements can provide some references for the stability evaluation of similar high rock slopes based on microseismic monitoring.

Key words： rock mechanics slope stability apparent stress MS monitoring apparent volume Baihetan hydropower station

引用本文:

张敏1，2，徐奴文1，2，陈文夫3，谭尧升3，戴峰1，蒋雄1，李韬1. 白鹤滩水电站左岸边坡开挖卸荷过程微震视应力特征研究[J]. 岩石力学与工程学报, 2018, 37(S2): 4133-4142.
ZHANG Min1，2，XU Nuwen1，2，CHEN Wenfu3，TAN Yaosheng3，DAI Feng1，JIANG Xiong1，LI Tao1. Analysis of microseismic apparent stress characteristics of the left bank slope at Baihetan hydropower station subjected to excavation. , 2018, 37(S2): 4133-4142.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0748 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS2/4133

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