Back analysis and prediction for displacement of surrounding rock around model tunnel of a powerstation
QI Junxiu 1, WANG Lianjie 2, LIU Fengcheng 1, WANG Wei 2, DONG Cheng 2
1.Beijing Guodian Water Resources and Electric Power Engineering Co.Ltd Beijing 100024 China 2.Geomechanics Research Institute of China Geological Academy of Science Beijing 100081 China
Abstract：Zhanghewan Pumped Storage Station was provided with four sets of pump-turbine units with a total capacity of 1000 MW,and its underground powerhouse was 151.1 m,23.4 m and 48.3 m in length,width and height,respectively.In order to further study the stability of the surrounding rock around powerhouse cavern and to optimize the design parameters,observation and experimental study were carried out for the surrounding rock around a model tunnel near the underground powerhouse.And,back analysis was done on the basis of the observed results of convergence,multi-point displacement and anchorage bar stress,and the calculated results were as follows: horizontal stress 2.52～2.88 MPa,stress ratio 0.7～0.8 and elastic modulus 26.0 GPa.According to the initial geostatic stress and deformation parameters obtained by the back analysis,a prediction for displacement and stress distribution of the surrounding rock around the machine hall and the main transformer chamber was conducted,and it was indicated that the deformations of the surrounding rock were smaller and coincident with the measured values of displacement.
齐俊修；王连捷；刘凤成；王薇；董诚；. 某电站模型洞围岩位移反分析及预测研究[J]. 岩土工程学报, 2007, 29(8): 1205-1210.
QI Junxiu 1, WANG Lianjie 2, LIU Fengcheng 1, WANG Wei 2, DONG Cheng 2. Back analysis and prediction for displacement of surrounding rock around model tunnel of a powerstation. Chinese J. Geot. Eng., 2007, 29(8): 1205-1210.
