(1.重庆蟠龙抽水蓄能电站有限公司,重庆401452;2.河海大学土木与交通学院,江苏 南京210098;3.河海大学水利水电学院,江苏 南京210098 )
(1.Chongqing Panlong Pumping and Energy Storage Co., Ltd., Chongqing 401452, China;2.College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;3.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China )
This paper focus on the mechanical properties of the surrounding rock (sandstone) in the chamber of Chongqing Panlong Pumped-Storage Power Station. Conventional triaxial compression instantaneous tests under different confining pressures were first performed using a servo-controlled triaxial testing machine for rocks, based on which a macroscopic elastoplastic constitutive model was developed and validated. The testing results show that with the increase of confining pressure, the compaction stage caused by the progressive closure of initial voids and microcracks becomes less and less obvious, and the nonlinearity disappears gradually.In addition, the peak strengths of rock specimen increase with the confining pressure, ranging from 84.8 MPa under uniaxial compression to 168.5 MPa under the confining pressure of 10 MPa. There presents a satisfactory linear relationship between peak strengths and confining pressures, from which we derive the material cohesion 15.2 MPa and the friction angle 52 degrees. Numerical results show that the proposed model containing a unified hardening/softening function can describe quite well the fundamental mechanical behaviors of the investigated sandstone, which demonstrates the feasibility of the proposed constitutive model.
陈张华,朱其志,吕超洋,等.蟠龙抽水蓄能电站硐室围岩三轴试验及本构模型[J].河海大学学报(自然科学版),2022,50(5):105-110.(CHEN Zhanghua, ZHU Qizhi, LYU Chaoyang, et al. Triaxial compression test and constitutive model of surrounding rockof tunnels in Panlong Pumped-Storage Power Station[J]. Journal of Hohai University (Natural Sciences),2022,50(5):105-110.(in Chinese))复制