丰宁抽水蓄能电站（一期）地下厂房开挖期阶段性安全监测分析

Phased Safety Monitoring and Analysis of Fengning Pumped Storage Power Station(Phase 1) Underground Powerhouse Excavation Period

丰宁抽水蓄能电站地下厂房地质条件复杂,应力分布不规律,地下厂房围岩变形总量偏大,目前最大变形值约为86 mm,围岩变形与施工开挖爆破、岩脉地质条件等密切相关,变形趋势特征呈现台阶状,以空间效应为主,岩脉分布区围岩变形具有一定的时间效应。对丰宁抽水蓄能电站地下厂房围岩变形及应力分布观测成果进行分析,可为优化设计、指导施工提供依据。

The geological conditions of the underground powerhouse of Fengning Pumped Storage Power Station are complicated,and the stress distribution is irregular.The total deformation of the surrounding rock of the underground powerhouse is too large.The current maximum deformation value is about 86 mm.Relatedly,the deformation trend is step-shaped,with space effect as the main factor,and the surrounding rock deformation in the distribution area of rock veins has a certain time effect.Analysis of the observation results of the surrounding rock deformation and stress distribution of the underground powerhouse of Fengning Pumped Storage Power Station can provide a basis for optimal design and construction guidance.