학술논문
水电站地下厂房洞室群施工期围岩变形特征与稳定性 / Deformation characteristics and stability of surrounding rock of underground powerhouse group of hydropower station during construction
Document Type
Academic Journal
Author
王辉; 陈卫忠; 郑朋强; 文志杰; 李楠; 王清标; WANG Hui; CHEN Weizhong; ZHENG Pengqiang; WEN Zhijie; LI Nan; WANG Qingbiao
Source
中南大学学报（自然科学版） / Journal of Central South University（Science and Technology). 48(4):1096-1103
Subject
Language
Chinese
ISSN
1672-7207
Abstract
根据施工过程岩层揭露情况,结合围岩变形监测数据,分析围岩变形状况.根据施工期岩层探测结果,建立地下厂房洞室群大型有限元模型,利用变形监测数据,对地下厂房洞室群的围岩力学参数进行反演分析;结合数值仿真结果,分析围岩变形规律.研究结果表明:主厂房第一层开挖穿越Ⅲ1,Ⅲ2和Ⅳ类围岩,围岩变形受岩层性质影响较明显,在IV类围岩穿越的副厂房位置,围岩变形较大;厂横0+153.81断面的变形明显比其他断面的大,在后续开挖过程中应加强对Ⅳ类围岩变形的监控量测.
According to the situation of strata exposed during the construction process, combined with the deformation monitoring of surrounding rock, the deformation condition was analysed. According to the detection results of rock mass during construction, the finite element model of large underground powerhouse cavern group was established. Using the deformation monitoring data, the mechanical parameters of surrounding rock of underground powerhouse cavern group was obtained by inversion analysis. Combined with the results of numerical simulation, the deformation law of surrounding rock was analyzed. The results show that the excavation of the first layer in the main powerhouse passes through the surrounding rock whose type is Ⅲ1, Ⅲ2 and Ⅳ. Deformation of surrounding rock is influenced more obviously by rock properties. In the location of auxiliary powerhouse which passes through surrounding rock of type Ⅳ, the deformation of surrounding rock is larger. The deformation of the No. 0+153.81 section of the main powerhouse is larger than the others and the monitoring measurement should be strengthened in surrounding rock of type Ⅳ in the subsequent excavation process.
According to the situation of strata exposed during the construction process, combined with the deformation monitoring of surrounding rock, the deformation condition was analysed. According to the detection results of rock mass during construction, the finite element model of large underground powerhouse cavern group was established. Using the deformation monitoring data, the mechanical parameters of surrounding rock of underground powerhouse cavern group was obtained by inversion analysis. Combined with the results of numerical simulation, the deformation law of surrounding rock was analyzed. The results show that the excavation of the first layer in the main powerhouse passes through the surrounding rock whose type is Ⅲ1, Ⅲ2 and Ⅳ. Deformation of surrounding rock is influenced more obviously by rock properties. In the location of auxiliary powerhouse which passes through surrounding rock of type Ⅳ, the deformation of surrounding rock is larger. The deformation of the No. 0+153.81 section of the main powerhouse is larger than the others and the monitoring measurement should be strengthened in surrounding rock of type Ⅳ in the subsequent excavation process.