【作者】 罗璨璨； 张建海； 李志国； 廖成刚； 李永红；

【Author】 LUO Can-can;ZHANG Jian-hai;LI Zhi-guo;LIAO Cheng-gang;LI Yong-hong;Water conservancy and hydroelectric College of Sichuan University;PowerChina Chengdu Engineering Corporation Limited;

【机构】 四川大学水力学及山区河流开发与保护国家重点实验室水利水电学院； 中国水电顾问集团成都勘测设计研究院；

【摘要】 以锦屏一级地下厂房、溪洛渡等高地应力大型地下厂房为研究对象,分析围岩多点位移计变形监测数据的时效特征,通过三参数指数函数拟合,得到各监测点围岩变形收敛平均时长。进而拟合得到围岩强度应力比、厂房开挖跨度及围岩变形收敛时间之间的经验公式。结果表明,围岩变形收敛时间与围岩强度应力比呈指数关系,与厂房开挖跨度呈线性关系。对于高地应力大型地下厂房,当围岩强度应力比处于1.5-4时,围岩变形收敛时间大于100天,且随着强度应力比的增大,变形收敛时间快速减小;当围岩强度应力比处于4-10时,围岩变形收敛时间约在25天到99天之间,且变形收敛时间减少速度逐渐放缓;当围岩强度应力比大于10时,变形收敛时间小于25天,且该阶段围岩强度应力比的增长对围岩变形收敛天数几乎不造成影响,在该阶段时,洞室跨度等结构因素影响更为明显。更多还原

【Abstract】 Taking the high-stress underground large-scale underground powerhouse such as Jinping first-level underground powerhouse and Xiluodu underground powerhouse as the research object, analyzing the aging the characteristics of deformation monitoring data gotten by the multi-point displacement meter monitor from the surrounding rock, and using a three-parameter exponential function to fit, we can obtain the average duration from the the surrounding rock disturbed to its convergence of each monitoring point. Then the empirical formula between the strength-stress ratio of surrounding rock, the span of plant excavation and the convergence time of surrounding rock deformation is obtained by fitting. The result shows that the convergence time of surrounding rock deformation is exponential with the strength-stress ratio of surrounding rock. And it is linear with the excavation span of the plant. For the large underground powerhouses with high ground stress, when the strength-stress ratio of surrounding rock is between 1.5 and 4, the convergence time of surrounding rock deformation is more than 100 days, and the deformation convergence time decreases rapidly with the increase of strength-stress ratio. When the strength-stress ratio of surrounding rock is between 4 and 10, the convergence time of surrounding rock deformation is between 25 days and 99 days, and the rate of decrease of deformation convergence time is gradually slowed down; when the strength-stress ratio of surrounding rock is greater than 10, the deformation convergence time is less than 25 days, and the increase of the strength-stress ratio of surrounding rock at this stage has little effect on the duration convergence of surrounding rock deformation. At this stage, the structural factors such as the cave span are more obvious than the strength-stress ratio.更多还原