考虑洞室岩体应力型破坏特征的局部地应力反演方法及应用  

Inversion method for local in situ stress considering stress-induced damage of cavern surrounding rock and its application

作　　者：裴书锋 赵金帅 于怀昌 刘国锋[2,4] 夏跃林 张頔 徐进鹏 PEI Shu-feng;ZHAO Jin-shuai;YU Huai-chang;LIU Guo-feng;XIA Yue-lin;ZHANG Di;XU Jin-peng(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou,Henan 450046,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang,Jiangsu 212013,China;School of Highway,Chang'an University,Xi'an,Shaanxi 710064,China;China Three Gorges Construction Management Co.,Ltd.,Chengdu,Sichuan 610041,China)

机构地区：[1]华北水利水电大学地球科学与工程学院,河南郑州450046 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [3]江苏大学土木工程与力学学院,江苏镇江212013 [4]长安大学公路学院,陕西西安710064 [5]中国三峡建设管理有限公司,四川成都610041

出　　处：《岩土力学》2020年第12期4093-4104,共12页Rock and Soil Mechanics

基　　金：河南省自然科学基金(No.202300410269);华北水利水电大学高层次人才科研启动项目(No.201912015);河南省重点研发与推广专项(科技攻关)项目(No.192102310007)。

摘　　要：介绍了一种考虑地下洞室片帮、钻孔剥落等岩体应力型破坏特征为信息源,通过数值模拟智能反演方法预测高应力大型地下洞室群围岩局部应力场的新思路。该方法将地下洞室群片帮、钻孔剥落等应力型破坏的位置、深度或者宽度进行定量描述,以弹性模型计算获得的常偏应力大于岩体启裂强度的范围来表示应力型破坏范围,通过分析实测地应力数据约束部分地应力数量,然后采用智能数值反演方法得到其他的地应力分量。采用该方法预测了白鹤滩水电站右岸地下厂房0+76断面附近围岩地应力场,反演获得最大主应力在34 MPa左右。通过其他部位岩体破裂的数值模拟和观测结果对比,验证了地应力场预测的合理性。A new method is proposed for predicting the in situ stress of local surrounding rock of large underground cavern group in high stress, various stress-induced fracturing, such as spalling of caverns and borehole breakouts are considered as the inversion information. This method quantitatively describes the location, depth or width of stress-type failure such as sheet wall and hole spalling of underground caverns, represent by the range of constant deviatoric stress greater than crack initiation stress of rockmass according to the elastic model calculation. The value or direction of local in-situ stress could be constrained based on the law of the measured geo-stress data, and the other in situ stress component are predicted by simulation modeling intelligent inversion method. This method is applied to predict the natural stress of rockmass near chainage 0+76 of the right bank underground powerhouse of Baihetan hydropower station. The predicted maximum principal stress is about 34 MPa, and the prediction rationality of in situ stress is verified by fracturing characteristics in other position through comparison of numerical simulation and field observation.

关 键 词：地下洞室 高地应力 应力型破坏 地应力反演 数值反演 

分 类 号：TU452[建筑科学—岩土工程]