Numerical simulation and deformation field measurement of powerhouse cavern excavation
A nonlinear, three-dimensional finite element model was applied to simulate the conventional procedure of underground workhouse excavation. The Drucker-Prager elastic-perfectly plastic material model was used for the simulation of rock mass, faults and the supporting structures. The material non-linearity was dealt with using an incremental technique. In monitor the stability of powerhouse cavern, the displacements of surrounding rock were measured during excavation. The field measurement results show that the surrounding rock of cavern is stable while the rock bolt and shotcrete were designed as the supporting structures. Maximum deformation of cavern surface is less than 6mm after 840 days. The most deformations of surrounding rock reached the stable states after the cavern excavation was finished. The principal and secondary factors affecting deformations of surrounding rock are spatial and temporal effect, respectively. The rock excavation for different stage in the measurement section played important role for the deformations of surrounding rock of cavern. The effect of neighbor domain excavation in adjacent section on the deformations of surrounding rock for the measurement section is secondary.
Shouju Li Yingxi Liu Fengji Wu
State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technolog Baishan Hydropower Plant, Jilin, 132110, China
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）