陡倾柱状节理岩体洞室松弛特征与破坏机制  

Relaxation Characteristics and Failure Mechanism of Steeply Dipping Columnar Jointed Rock Caverns

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作  者:裴书锋 王驭正 江权[3] 张建聪 樊义林 Pei Shufeng;Wang Yuzheng;Jiang Quan;Zhang Jiancong;Fan Yilin(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,P.R.China;Postdoctoral Research Station,China Three Gorges Corporation,Wuhan 430010,P.R.China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,P.R.China;Power China Huadong Engineering Corporation,Hangzhou 311122,P.R.China;China Three Gorges Corporation,Wuhan 430010,P.R.China)

机构地区:[1]华北水利水电大学地球科学与工程学院,郑州450046 [2]中国长江三峡集团有限公司博士后工作站,武汉430010 [3]中国科学院武汉岩土力学研究所,武汉430071 [4]中国电建集团华东勘测设计研究院有限公司,杭州311122 [5]中国长江三峡集团有限公司,武汉430010

出  处:《地下空间与工程学报》2024年第2期597-605,共9页Chinese Journal of Underground Space and Engineering

基  金:河南省自然科学基金(202300410269);华北水利水电大学高层次人才科研启动项目(201912015);中国长江三峡集团有限公司科研项目(201903073)。

摘  要:白鹤滩水电站柱状节理岩体具有特殊的柱体结构特征,洞室开挖后卸荷松弛破坏严重。通过对白鹤滩水电站4#导流洞柱状节理岩体现场破坏调查、位移和松弛深度监测,发现柱状节理洞室呈现典型的非对称破坏特征,不同部位松弛深度差异较大,左右侧边墙破坏模式受倾角影响,分别呈现倾倒破坏和滑移破坏。离散元数值模拟结果显示洞室表层围岩主要以柱间节理张拉破坏为主,内部围岩以剪切破坏为主,左右侧边墙不同的变形破坏特征是柱体倾角和地应力综合作用的结果。最后分析了不同柱体倾角对洞室变形破坏特征的影响,不同倾角下洞室各部位松弛深度差异显著,应根据洞室不同部位塑性区深度和柱体角度进行预应力锚杆设计。The columnar jointed rock mass of Baihetan Hydropower Station has special column structure characteristics,and the unloading relaxation damage is serious after the excavation of the cavern.Through the on-site failure investigation,displacement and relaxation depth monitoring of the columnar jointed rock mass of the 4#diversion tunnel of Baihetan Hydropower Station,it is found that the columnar joint cavern presents typical asymmetric failure characteristics,and the relaxation depth of different parts is quite different.The failure modes of the left and right side walls are affected by the inclination angle,showing dump failure and slip failure,respectively.The discrete element numerical simulation results show that the surface surrounding rock of the cavern is mainly caused by inter-column joint tension failure,and the inner surrounding rock is mainly caused by shear failure.The different deformation and failure characteristics of the left and right sidewalls are the result of the combined effect of the cylinder inclination and in-situ stress.Finally,the influence of different columnar joint inclination angles on the deformation and failure characteristics of the cavern is analyzed.The relaxation depths of different parts of the cavern under different inclination angles are significantly different.The prestressed bolt design should be carried out according to the depth of the plastic zone and the inclination angle of the cylinder in different parts of the cavern.

关 键 词:白鹤滩水电站 柱状节理 地下洞室 数值模拟 松弛深度 支护建议 

分 类 号:TU45[建筑科学—岩土工程]

 

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