地下厂房洞室群岩体参数的增量位移反分析  

Increment Displacement Back Analysis of Rock Mass Parameters for Underground Chambers

作　　者：张飞[1,2] 王宏沛[3] 徐光黎[1,2] 张新杰[1,2] 朱可俊[4] 

机构地区：[1]中国地质大学岩土钻掘与防护教育部工程研究中心,湖北武汉430074 [2]中国地质大学工程学院,湖北武汉430074 [3]江苏省地质工程勘察院,江苏南京210012 [4]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《水电能源科学》2012年第12期94-97,214,共5页Water Resources and Power

摘　　要：考虑大岗山水电站地下厂房洞室群围岩参数获取的复杂性和不确定性,提出针对大型地下洞室群分层开挖的岩体参数增量位移反演分析法,采用粘弹性(H-K)本构模型,基于地下厂房分层开挖实测位移,通过合理选择待反演参数,以每层开挖引起的增量位移计算值与实测值残差平方和为目标函数,利用遗传模拟退火算法优化目标函数,实现各向同性粘弹性参数的增量位移反分析。对反演得到的等效岩体参数进行正演分析,再对后续厂房开挖引起的围岩增量位移进行预测,可进一步判断围岩稳定性。In view of the complexity and uncertainty of rock mass parameters of underground powerhouse chambers for Dagangshan hydropower station, increment displacement back analysis of rock mass parameters is proposed for layered excavation of large underground chambers. Based on the measured displacement of underground powerhouse layered exca- vation, the method adopts the viscoelastic （H-K） constitutive model and selects the residual errors square sum of incre- mental displacements caused by each excavation calculated and measured values as the objective function. Through the ra- tional choice of retrieved parameters, genetic simulated annealing algorithm is applied to optimize objective function and the incremental displacement back analysis of isotropic viscoelastic parameters is achieved. The equivalent rock mass pa- rameters obtained by back analysis are used to forward analysis and the incremental displacement of surrounding rock caused by the follow-up powerhouse excavation is predicted, which is further to determine the stability of surrounding rock.

关 键 词：岩体参数 增量位移反分析 地下洞室群 分层开挖 正演优化 大岗山水电站 

分 类 号：TV731.6[水利工程—水利水电工程] TU45[建筑科学—岩土工程]