基于离散元模拟和微震监测的白鹤滩水电站左岸地下厂房稳定性分析

doi:10.16285/j.rsm.2019.1424

岩土力学 ›› 2020, Vol. 41 ›› Issue (7): 2470-2484.doi: 10.16285/j.rsm.2019.1424

基于离散元模拟和微震监测的白鹤滩水电站左岸地下厂房稳定性分析

毛浩宇¹，徐奴文¹，李彪²，樊义林³，吴家耀⁴，孟国涛⁴

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

收稿日期:2019-08-19 修回日期:2019-12-30 出版日期:2020-07-10 发布日期:2020-09-20
通讯作者: 李彪，男，1990年生，博士，讲师，主要从事岩土工程动力灾害方面的教学与研究工作。E-mail: libiaoscu@163.com E-mail:maohaoyu@stu.scu.edu.cn
作者简介:毛浩宇，男，1995年生，硕士研究生，主要从事微震监测方面的研究
基金资助:
国家重点研发计划（No.2018YFC1505004，No.2017YFC1501100）；国家自然科学基金（No. 51679158）。

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-yu¹, XU Nu-wen¹, LI Biao², FAN Yi-lin³, WU Jia-yao⁴, MENG Guo-tao⁴

1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 3. China Three Gorges Projects Development Co., Ltd., Beijing 100038, China; 4. HydroChina Itasca Research and Development Center, Hangzhou, Zhejiang 310014, China

Received:2019-08-19 Revised:2019-12-30 Online:2020-07-10 Published:2020-09-20
Supported by:
This work was supported by the National Key R & D Program of China (2018YFC1505004, 2017YFC1501100) and the National Natural Science Foundation of China (51679158).

摘要/Abstract

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。

关键词: 围岩稳定性, 离散单元法, 数值模拟, 开挖卸荷, 微震监测

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.

Key words: stability of surrounding rock, discrete element method, numerical simulation, excavation unloading, microseismic monitoring

中图分类号:

TU 45

毛浩宇, 徐奴文, 李彪, 樊义林, 吴家耀, 孟国涛, . 基于离散元模拟和微震监测的白鹤滩水电站左岸地下厂房稳定性分析[J]. 岩土力学, 2020, 41(7): 2470-2484.

MAO Hao-yu, XU Nu-wen, LI Biao, FAN Yi-lin, WU Jia-yao, MENG Guo-tao, . Stability analysis of an underground powerhouse on the left bank of the Baihetan hydropower station based on discrete element simulation and microseismic monitoring[J]. Rock and Soil Mechanics, 2020, 41(7): 2470-2484.

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基于离散元模拟和微震监测的白鹤滩水电站左岸地下厂房稳定性分析

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

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