文登抽水蓄能电站地下厂房施工期围岩安全监测分析

Analysis of Safety Monitoring Data for Surrounding Rock Masses of Underground Powerhouse of Wendeng Pumped Storage Power Station During Construction Period

依据文登抽水蓄能电站地下厂房施工期安全监测数据,对施工期围岩变形和支护受力进行了分析。监测成果表明,主厂房、主变室开挖围岩总体变形不大,最大变形量值为13.01mm,围岩变形-历时曲线整体上台阶状特征显著,不具有明显的时效性;支护体系受力也在正常范围内,表明地下厂房围岩是基本稳定的。结合厂区工程地质条件及物探成果,文登抽水蓄能电站地下厂房洞室围岩稳定主要受到石英二长岩岩性、长大裂隙、断层等地质结构控制,岩体变形受到应力卸荷松弛与局部岩体结构作用,变形较大区域多为受局部不良岩体结构和围岩开挖卸荷损伤作用所致。

Based on the safety monitoring data of underground powerhouse of Wendeng pumped storage power station during the construction period,the surrounding rock deformation and supporting force during the construction period are analyzed.The monitoring results show that the overall deformation of the excavation surrounding rock of the main power house and main transformer chamber is not large,and the maximum deformation value is 13.01mm.The deformation duration curve of surrounding rock has obvious step feature on the whole,which does not have obvious timeliness;the stress of support system is also within the normal range,indicating that the surrounding rock of underground powerhouse is basically stable.Combined with the engineering geological conditions and geophysical prospecting results of the plant area,the stability of the surrounding rock of the underground powerhouse of Wendeng pumped storage power station is mainly controlled by the lithology of quartz monzonite,long cracks and faults.The deformation of rock mass is affected by stress unloading relaxation and local rock mass structure,and the large deformation area is mainly caused by local bad rock mass structure and surrounding rock excavation unloading damage.