溧阳水电站地下厂房开挖破坏机理数值模拟研究  

Numerical Simulation of Surrounding Rock Failure of Underground Powerhouse of Liyang Hydropower Station Subjected to Excavation

作　　者：胡育林 文学军 胡林江 HU Yulin;WEN Xuejun;HU Linjiang(Zhongnan Engineering Corporation Limited,Power China,Changsha 410014,China)

机构地区：[1]中国电建集团中南勘测设计研究院有限公司

出　　处：《河南科学》2019年第9期1467-1474,共8页Henan Science

基　　金：国家重点基础研究发展计划(973计划)(2015CB057903);国家自然科学基金面上项目(51679071)

摘　　要：为研究溧阳水电站地下洞室开挖围岩稳定性,以地下厂房开挖时提供的地质条件和勘察资料为基础,结合完整岩块的强度试验成果,采用颗粒流数值模拟方法研究厂房在破碎岩体中开挖的破坏机理.研究表明,颗粒离散元方法可以较好地模拟地下洞室开挖情况;联合开挖时,出现明显的贯通变形区,且并非距离开挖面越近围岩变形越大;厂房开挖破坏模式为岩体结构控制型破坏,其导致围岩破坏的决定性因素是岩体结构特征.In order to study the stability of surrounding rock in underground cavern excavation of Liyang hydropower station,based on the geological conditions and survey data provided during excavation of underground powerhouse,combined with the results of the strength test of the complete rock mass,a numerical simulation method of particle flow is used to study the failure mechanism of the excavation of the plant in the fractured rock mass. The results show that the excavation of underground cavern can be simulated well by the particle discrete element method. In the joint excavation,there is obvious penetrating deformation area,and when the site is closer to the excavation surface,the deformation of the surrounding rock would not be greater. The failure mode of plant excavation is the control type failure of rock mass structure,and the decisive factor which leads to the failure of surrounding rock is the structural characteristics of rock mass.

关 键 词：地下厂房 洞室群 破坏机制 破碎岩体 颗粒离散元 溧阳水电站 

分 类 号：TV731.6[水利工程—水利水电工程]