摘要
块体理论是地下洞室围岩稳定性分析的主要方法之一。通过运用块体理论对阜康抽水蓄能电站主厂房顶拱的块体进行了稳定性分析,首先根据开挖揭露的节理裂隙信息,搜索关键块体,获得关键块体的大小规模、出露面积,埋深等几何信息,结果显示主厂房顶拱结构面切割形成的块体的破坏模式均为顶拱冒落,形成的块体体积在236.16~995.43 m^(3),最大埋深在3.74~7.85 m。在考虑未贯通结构面及假设剪裂面的黏聚力对块体的阻滑作用基础上,对顶拱悬吊型块体在不考虑支护、考虑原设计支护、考虑追加支护三种条件下的稳定安全系数进行计算,对锚固措施进行校核。根据块体稳定性计算结果,为获得2.0的块体稳定性安全系数,各块体需要的锚索支护数量为2~5根。根据后续的位移监测数据验证支护效果,监测结果表明,通过锚索支护之后拱顶块体及周边围岩目前趋于稳定状态。
Block Theory is one of the main methods for stability analysis of surrounding rock in underground caverns.Using the Block Theory,the stability of the blocks on the top arch of the powerhouse of Fukang Pumped Storage Power Station is analyzed.First,based on the joint and fissure information revealed by the excavation,the key blocks are investigated to obtain the geometric information such as size,scale,exposed area and burial depth of the key blocks.The results show that the failure mode of the blocks formed by cutting the top arch structural surface of the powerhouse is the collapse of the top arch.The volume of the formed block is 236.16~995.43 m^(3),and the maximum burial depth is 3.74~7.85 m.On the basis of considering the anti-sliding effect of the cohesion of the unpenetrated structural surface and the assumed shear surface on the block,the stability safety factor of the top arch suspended block under conditions of no support,original design support,and additional support is calculated respectively,and the anchoring measures are checked.According to the block stability calculation results,in order to obtain a block stability safety factor of 2.0,the number of anchor cables required for each block is 2 to 5.The support effect is verified based on subsequent displacement monitoring data.The monitoring results show that the top arch block and surrounding rocks are currently in a stable state with support of anchor cables.
作者
景浩
艾飞
JING Hao;AI Fei(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《西北水电》
2023年第5期84-90,共7页
Northwest Hydropower
基金
国家自然科学基金项目(51779249).
关键词
抽水蓄能电站
主厂房
顶拱
块体
稳定性分析
支护设计
pumped storage power station
powerhouse
top arch
block
stability analysis
support design
作者简介
景浩(1979-),男,陕西省乾县人,高级工程师,主要从事抽水蓄能电站水工建筑物设计工作.
