地下厂房洞室群岩体参数的增量位移反分析
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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 excavation,the method adopts the viscoelastic(H-K) constitutive model and selects the residual errors square sum of incremental displacements caused by each excavation calculated and measured values as the objective function.Through the rational 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 parameters 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.
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 excavation,the method adopts the viscoelastic(H-K) constitutive model and selects the residual errors square sum of incremental displacements caused by each excavation calculated and measured values as the objective function.Through the rational 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 parameters 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.
引文
[1]黄宏伟.岩土工程中位移量测的随机逆反分析[J].岩土工程学报,1995,17(2):36-41.
[2]杨志法.可望推广的一种实用方法———弹性均质条件下三维有限元图谱-位移反分析[A].中国北方岩石力学与工程应用学术会议论文集[C].郑州:科学出版社,1991:67-74.
[3]姚显春,李宁,陈莉静,等.拉西瓦水电站地下厂房洞室群分层开挖过程仿真反演分析[J].岩石力学与工程学报,2011,30(S1):3052-3059.
[4]聂卫平,杨云浩,石崇,等.糯扎渡水电站调压井围岩力学参数反演与反馈分析[J].河海大学学报(自然科学版),2011,39(1):54-60.
[5]张晨明,朱合华,赵海斌.增量位移反分析在水电地下洞室工程中的应用[J].岩土力学,2004,25(S2):149-153.
[6]朱合华,张晨明,王建秀,等.龙山双连拱隧道动态位移反分析与预测[J].岩石力学与工程学报,2006,25(1):67-73.
[7]刘学增,苏京伟.粘弹性动态增量反演分析在隧道施工中的应用[J].同济大学学报(自然科学版),2009,37(10):1 308-1 312.
[8]李宁,段小强,陈方方,等.围岩松动圈的弹塑性位移反分析方法探索[J].岩石力学与工程学报,2006,25(7):1 304-1 308.
[9]江权,冯夏庭,苏国韶,等.基于松动圈–位移增量监测信息的高地应力下洞室群岩体力学参数的智能反分析[J].岩石力学与工程学报,2007,26(S1):2 654-2 662.
[2]杨志法.可望推广的一种实用方法———弹性均质条件下三维有限元图谱-位移反分析[A].中国北方岩石力学与工程应用学术会议论文集[C].郑州:科学出版社,1991:67-74.
[3]姚显春,李宁,陈莉静,等.拉西瓦水电站地下厂房洞室群分层开挖过程仿真反演分析[J].岩石力学与工程学报,2011,30(S1):3052-3059.
[4]聂卫平,杨云浩,石崇,等.糯扎渡水电站调压井围岩力学参数反演与反馈分析[J].河海大学学报(自然科学版),2011,39(1):54-60.
[5]张晨明,朱合华,赵海斌.增量位移反分析在水电地下洞室工程中的应用[J].岩土力学,2004,25(S2):149-153.
[6]朱合华,张晨明,王建秀,等.龙山双连拱隧道动态位移反分析与预测[J].岩石力学与工程学报,2006,25(1):67-73.
[7]刘学增,苏京伟.粘弹性动态增量反演分析在隧道施工中的应用[J].同济大学学报(自然科学版),2009,37(10):1 308-1 312.
[8]李宁,段小强,陈方方,等.围岩松动圈的弹塑性位移反分析方法探索[J].岩石力学与工程学报,2006,25(7):1 304-1 308.
[9]江权,冯夏庭,苏国韶,等.基于松动圈–位移增量监测信息的高地应力下洞室群岩体力学参数的智能反分析[J].岩石力学与工程学报,2007,26(S1):2 654-2 662.