摘要
在对锦屏一级水电站和溪洛渡水电站地下厂房围岩大量声波波速-深度曲线及其曲线拟合的基础上,将声波波速-深度曲线分成5类;利用经典的波速-弹性模量关系式将地下厂房围岩深度与弹性模量联系起来,对开挖后的洞壁岩体松弛现象和弹性模量下降的规律进行评价,提出洞周松动圈深度拟合公式。将提出的松动圈拟合公式应用于地下厂房围岩监测反馈分析和超前预报,分析成果比传统弹塑性理论更符合围岩实际变形规律。研究结果为围岩变形稳定分析和开挖反馈分析提供理论基础。
Based on large amounts of wave velocity-depth curves of surrounding rocks in underground powerhouses of Jingping I and Xiluodu hydropower stations,the acoustic velocity-depth curves are analyzed and classified into 5 types.With the least square method,acoustic velocity-depth curves are fitted with 3 different functions.By substituting the acoustic velocity in classical wave velocity-elastic modulus formula with the fitting functions,the relationship between elastic modulus and depth of surrounding rock in underground powerhouse is established.Thus the relaxation phenomenon of elastic modulus of rock mass near the cave wall and decreasing law of elastic modulus after excavation are evaluated;and the fitting formula in wall rock loosing zone is proposed.The newly proposed formula is applied to back analysis and deformation advanced forecasting in underground powerhouse.The analytical results fit practical deformation law of surrounding rock much better than classical elastoplastic analysis results.The study results provide a new theoretical foundation for stability calculation and feedback analysis of surrounding rocks.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2011年第6期1191-1197,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB732005)
关键词
岩石力学
岩体声波检测
最小二乘拟合
围岩松动圈
地下厂房
rock mechanics
rock mass acoustic detection
least square method fitting
surrounding rock loosing zone
underground powerhouse
