摘要
文登抽水蓄能电站地下厂房岩性较好,但地应力场相比同等埋深下其它工程偏高,且主厂房有断层穿过。为更好地分析地下厂房施工期围岩稳定性,依据文登抽水蓄能电站地下厂房施工期地质情况、物探成果、安全监测数据和数值分析成果,对施工期围岩变形机理进行了分析。成果表明,地下厂房开挖扰动使围岩出现松弛,松弛深度在1.4 m以内;地下厂房总体变形不大,支护体系受力也在正常范围内,较大变形和支护受力区域主要受局部不良岩体结构和较强的开挖卸荷扰动影响所致;受较高岩体质量和地应力场条件影响,厂房开挖后围岩松弛圈内易出现平行于边墙的卸荷性裂隙,使得围岩中局部可能会出现相对较大的变形和较高的支护受力。
Though the lithology of the Wendeng pumped storage power station is good,faults pass through its main plant and the geostress field is higher than that of other projects with the same depth.In order to analyze the stability of the underground powerhouse during the construction period,the relaxation depth,the deformation and the rock bolt stress is analyzed based on the geophysical prospecting data and the safety monitoring data of underground powerhouse of Wendeng pumped storage power station.Results show that the excavation disturbance of the underground powerhouse causes the surrounding rock relaxation to a certain extent and the relaxation depth is within 1.4 m.In addition,the deformation of the surrounding rock of the main powerhouse are small on the whole and the stress of the supporting system is also within the normal range.Larger deformation and supporting stress areas are mainly caused by local adverse rock structures and strong excavation unloading disturbance.Moreover,under the influence of higher rock mass index and geostress field,unloading fractures parallel to the side walls are likely to occur in the relaxation circle of the surrounding rock after the excavation of the main plant,which may lead to relatively large local deformation and higher supporting stress.
作者
何少云
胡紫航
卫洋波
何军
刘登学
HE Shaoyun;HU Zihang;WEI Yangbo;HE Jun;LIU Dengxue(Shandong Wendeng Pumped Storage Co.,Ltd.,Weihai,Shandong 264419,China;Beijing Engineering Co.,Ltd.,Powerchina,Beijing 100024,China;Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan,Hubei 430010,China)
出处
《水利与建筑工程学报》
2021年第2期191-196,共6页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金资助项目(51539002
41807249
51779018
51809014)
中央级公益性科研院所基本科研业务费项目(CKSF2019434/YT
CKSF2019169/YT)。
关键词
抽水蓄能电站
地下厂房
安全监测
支护受力
pumped storage power station
underground powerhouse
safety monitoring
supporting stress
作者简介
何少云(1975-),男,硕士,高级工程师,主要从事水电工程技术及管理工作。E-mail:316381350@qq.com;通讯作者:何军(1987-),男,博士,高级工程师,主要从事工程岩体稳定性分析工作。E-mail:jun he@whu.edu.cn。
