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首页> 外文期刊>International Journal of Rock Mechanics and Mining Sciences >Deformation forecasting and stability analysis of large-scale underground powerhouse caverns from microseismic monitoring
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Deformation forecasting and stability analysis of large-scale underground powerhouse caverns from microseismic monitoring

机译：基于微震监测的大型地下厂房洞室变形预测与稳定性分析

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摘要

To assess the stability of the underground powerhouse caverns and analyse the failure mechanism of the surrounding rock mass at the Baihetan hydropower station in southwest China, a high-resolution microseismic (MS) monitoring system was implemented in the left-bank underground powerhouse caverns. Based on the temporal and spatial distribution of MS events, the correlation between MS activities and construction was established, and three damage regions for the surrounding rock mass during excavation were identified. MS clusters were found to occur most often in stress-concentration regions of the underground powerhouse caverns and to result from various factors, including excavation-induced unloading and geological structure activation. The seismic source parameters (i.e., moment magnitudes and (S-wave) to (P-wave) energy ratios, E-s/E-p) of the three MS clusters demonstrate the different failure modes and risks of the surrounding rock mass. The temporospatial evolution of the MS activities, apparent stress, and cumulative apparent volume in localized rock mass during the period of a typical large deformation were used to develop a comprehensive analytical method for forecasting the deformation of the surrounding rock mass. Thus, this comprehensive analytical method, which incorporates MS monitoring, conventional monitoring, geological survey and construction, is promising for identifying the damage zones and forecasting the macro-deformation of the surrounding rock mass in underground powerhouse caverns subjected to excavation. (C) 2016 Elsevier Ltd. All rights reserved.
机译：为了评估地下厂房洞室的稳定性并分析西南白河滩水电站围岩的破坏机理，在左岸地下厂房洞室中采用了高分辨率的微震监测系统。根据MS事件的时空分布，建立了MS活动与构造之间的相关性，确定了开挖过程中围岩的三个破坏区域。 MS集群最常出现在地下厂房洞穴的应力集中区域，并且是由多种因素导致的，包括开挖引起的卸载和地质构造活化。三个MS群集的震源参数（即弯矩大小和（S波）与（P波）能量比E-s / E-p）证明了不同的破坏模式和围岩风险。利用MS活动的颞pat演化，表观应力和局部岩体在典型大变形期间的累积表观体积，开发了一种综合分析方法来预测围岩的变形。因此，这种综合分析方法结合了MS监测，常规监测，地质调查和施工，对于确定受损区域和预测受开挖的地下厂房洞室中围岩的宏观变形是很有希望的。 （C）2016 Elsevier Ltd.保留所有权利。

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