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投稿时间：2016-08-04 修订日期：2017-01-06
投稿时间：2016-08-04 修订日期：2017-01-06
中文摘要: 随着中国水电资源开发的推进，越来越多水电站修建于高山峡谷之中，受地形地貌的影响，大量水电站厂房布置于层状岩体之中，定量分析层状节理岩体地下厂房变形并评价其稳定性成为亟需解决的重要课题。本文结合现场监测及数值模拟结果，分析不同密度层状岩体对于地下厂房变形的影响。对多点位移计、声波测试、微震监测等多种监测结果进行整理和归纳，从多角度揭示围岩变形规律及内部损伤情况。另外基于厂区工程地质特性、地应力实测资料，利用通用离散元程序UDEC对7#机组典型剖面进行数值分析，得到地下厂房开挖后的应力场、塑性区、位移场分布规律，揭示围岩潜在破坏区域。数值模拟与微震监测结果共同表明：围岩第Ⅵ层（高程815.40~809.00 m）开挖时，上游边墙812 m高程位移增加最快，微震事件数量大幅增长。水平向应力卸荷程度大于竖向应力卸荷程度；整体上主厂房上游侧位移大于下游侧，最大变形出现在上游边墙812 m高程附近，此处围岩屈服深度最大，围岩屈服集中区域与变形场分布基本一致，上游层状节理比下游密集是造成上下游变形差异的主要原因。围岩变形与层状节理分布关系密切，开挖活动将引起围岩层状节理活化、岩体损伤、围岩整体强度降低。开挖强度越大，微震事件增加越快，变形越大。乌东德地下厂房变形机制的研究对其后续施工及其安全运营具有重要意义。
Abstract:With the developing of hydroelectricity resource, more and more hydropower stations were built in alpine valleys which had complex geographic and geomorphic conditions,and many of them were built in underground with bedded rock.Therefore it has been a critical issue to quantitatively analyze the deformation and stability of underground powerhouse located in bedded rock.The deformation of bedded rock with different dense was analyzed in this case by means of field monitoring and numerical simulation.The results of deformation monitoring,acoustic wave testing and microseismic monitoring were employed to reveal the deformation law and damage zone of surrounding rock.Based on the characteristics of geologic framework and measured data,a calculation model was established to study the stress and deformation field,and plastic zone for the purpose of searching for the potential damage zone of the underground powerhouse during excavation unloading by using the plastic zone had a close connection with that of deformation.The difference of deformation was the result of discrete element analysis procedure UDEC.It was shown by the simulation and microseismic monitoring toghther that when the 6th floor which is between the elevation 815~809 m,the deformation value of elevation 812 m at the upstream side wall increases the fastest, and the amount of maicroseismic events around it increased rapidly.As a whole,the unloading of X axis was more acute than that of Y axis;the defomation value of the upstream side was greater than that of the downstream side.The maximum value of the deformation appears at the elevation of 812 m at the upstream side wall where the value of deepness of the plastic zone is largest.The distribution was more intensive bedding joint at the upstream side than that of the downstream side.
The deformation of the surrounding rock has a close connection with the dense of the bedding joint,and the excavation will lead to the activity of bedding joint,leading to the damage of the surrounding rock and reducing the overall strength of the surrounding rock.The severer the excavation is,the faster the quantity of microseismic event increases.The research results will provide useful references for later construction and operation of the underground powerhouse.
keywords: underground powerhouse layered and jointed rock masses UDEC microseismic monitoring deformation characteristic surrounding rock damage
文章编号：201600772 中图分类号： 文献标志码：
基金项目:国家重点基础研究发展计划资助项目(2015CB057903)；国家自然科学基金面上项目资助(51374149)
| 作者 | 单位 |
| 胡中华 | 四川大学 水力学与山区河流开发保护国家重点实验室 |
| 徐奴文 | 四川大学 水力学与山区河流开发保护国家重点实验室 |
| 戴峰 | 四川大学 水力学与山区河流开发保护国家重点实验室 |
| 顾功开 | 中国长江三峡集团公司 |
| 刘科 | 中国长江三峡集团公司 |
| 李昂 | 四川大学 水力学与山区河流开发保护国家重点实验室 |
| 李彪 | 四川大学 水力学与山区河流开发保护国家重点实验室 |
作者简介:
引用文本：
胡中华,徐奴文,戴峰,顾功开,刘科,李昂,李彪.乌东德水电站地下厂房层状节理岩体稳定性研究[J].工程科学与技术,2017,49(Z1):103-111.
Hu Zhonghua,Xu Nuwen,Dai Feng,Gu Gongkai,Liu Ke,Li Ang,Li Biao.Stability Analysis of Layered and Jointed Rock Masses at Rigth Bank Underground Powerhouse of Wudongde Hydropower Station[J].Advanced Engineering Sciences,2017,49(Z1):103-111.
引用文本：
胡中华,徐奴文,戴峰,顾功开,刘科,李昂,李彪.乌东德水电站地下厂房层状节理岩体稳定性研究[J].工程科学与技术,2017,49(Z1):103-111.
Hu Zhonghua,Xu Nuwen,Dai Feng,Gu Gongkai,Liu Ke,Li Ang,Li Biao.Stability Analysis of Layered and Jointed Rock Masses at Rigth Bank Underground Powerhouse of Wudongde Hydropower Station[J].Advanced Engineering Sciences,2017,49(Z1):103-111.