Stability analysis of an underground powerhouse on the left bank of the Baihetan hydropower station based on discrete element simulation and 
microseismic monitoring

MAO Hao-yu; XU Nu-wen; LI Biao; FAN Yi-lin; WU Jia-yao; MENG Guo-tao

doi:10.16285/j.rsm.2019.1424

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Stability analysis of an underground powerhouse on the left bank of the Baihetan hydropower station based on discrete element simulation and microseismic monitoring

更新时间：2026-06-25

- Stability analysis of an underground powerhouse on the left bank of the Baihetan hydropower station based on discrete element simulation and microseismic monitoring
- Vol. 41, Issue 7, Pages: 2470-2484(2020)
- 作者机构：
  
  1. 四川大学水力学与山区河流开发保护国家重点实验室,四川,成都,610065
  2. 西南石油大学地球科学与技术学院,四川,成都,610500
  3. 中国三峡建设管理有限公司,北京,100038
  4. 浙江中科依泰斯卡岩石工程研发有限公司,浙江,杭州,310014
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.1424
  CLC： TV223
- Online First：20 September 2020，
  
  Published：2020
- 稿件说明：
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MAO Hao-yu, XU Nu-wen, LI Biao, et al. Stability analysis of an underground powerhouse on the left bank of the Baihetan hydropower station based on discrete element simulation and microseismic monitoring[J]. 2020, 41(7): 2470-2484.
DOI：

MAO Hao-yu, XU Nu-wen, LI Biao, et al. Stability analysis of an underground powerhouse on the left bank of the Baihetan hydropower station based on discrete element simulation and microseismic monitoring[J]. 2020, 41(7): 2470-2484. DOI： 10.16285/j.rsm.2019.1424.

摘要

针对白鹤滩水电站地下洞室群开挖过程围岩稳定问题，基于离散单元法的数值仿真软件3DEC，研究开挖卸荷作用对围岩变形和破坏的影响；引入微震监测技术，对洞室围岩内部微破裂演化实时监测和分析，并将数值模拟结果与微震监测数据对比分析；借助常规位移监测研究围岩宏观变形的时空演化规律，验证数值模拟和微震监测结果的准确性。研究结果表明，围岩损伤与现场施工状态密切相关，同时受各种地质结构影响；数值模拟得到的围岩变形特征与微震监测得到的微震事件聚集规律基本一致，且与常规监测结果对应良好，采用三维离散元数值模拟和微震监测技术相结合的综合研究方法，能够较好地描述围岩在开挖卸荷作用下的力学行为，有效评估洞室围岩的损伤特征和潜在风险区域。

Abstract

To investigate the stability of the surrounding rock during excavation process of the underground caverns at the Baihetan hydropower station

effects of excavation unloading on the deformation and failure of the surrounding rock using the numerical simulation software 3DEC based on DEM (discrete element method) are analyzed. The microseismic monitoring technology is introduced to monitor and analyze micro-fracture evolution inside the surrounding rock of the caverns in real time

and the numerical simulation results are compared with the microseismic monitoring data. In order to verify the accuracy of numerical simulation and microseismic monitoring results

the spatiotemporal evolution law of the macro-deformation of the surrounding rock is studied by conventional displacement monitoring. The results show that the damage of surrounding rock is closely related to the on-site construction state and also affected by various geological structures. The deformation characteristics of the surrounding rock obtained by numerical simulation are basically consistent with the aggregation rules of microseismic events obtained by microseismic monitoring

and the results are in good agreement with the conventional monitoring results. The comprehensive research method combining the three-dimensional discrete element numerical simulation and microseismic monitoring technology can better describe the mechanical behavior of the surrounding rock under excavation unloading

and effectively evaluate the damage characteristics and potential risk areas of surrounding rock.

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