溧阳抽水蓄能电站CZ0+143.125监测断面数据异常情况数值分析研究

溧阳抽水蓄能电站工程地质条件复杂,在开挖过程中,CZ0+143.125监测断面下游侧边墙受中槽及边墙开挖影响较大,尤其在开挖面靠近该断面时,下游边墙Mc 44-6(拱座与岩壁吊车梁之间)多点位移计测值持续增长,随着支护的跟进,围岩变形测值有收敛趋势;但在后续母线洞开挖施工过程中,边墙围岩位移仍呈增大趋势。针对该部分围岩地质条件,利用FLAC 3D计算软件对该部位围岩进行数值分析研究,分析数据异常原因,并对洞室围岩安全性进行分析评价。

Numerical Analysis on Abnormal Data of CZ0+143.125 MonitoringSection of Liyang Pumped-storage Power Station

Due to the complicated engineering geological conditions of Liyang Pumped-storage Power Station,the downstream side wall identified as CZ0+143.125 monitoring section is greatly influenced by the excavation of slot and sidewall,especially when the excavation approaches to the monitoring section,the multipoint displacement meters show continuous displacement increase occurring at the downstream wall marked Mc 44-6(between crown abutment and bridge crane girder).After reinforcement applied,the surrounding rock of side wall has a tendency to converge.However,in subsequent excavation of busbar gallery,the displacement of the surrounding rock of sidewall is still increasing.In view of the geological conditions,the surrounding rock is numerically analyzed by FLAC 3D to figure out the causes of such abnormal data,and evaluate the safety of surrounding rock.