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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。
Considering the complexity and uncertainty of obtaining surrounding rock parameters of caverns in underground powerhouse of Dagangshan Hydropower Station, this paper proposes an incremental displacement back analysis method of rock mass parameters for large-scale underground cavern group excavation. Viscoelasticity (HK ) Constitutive model. Based on the measured displacement of stratified excavation in underground powerhouse, through the reasonable choice of parameters to be inverted, the square sum of residual displacements calculated by incremental displacements caused by each excavation is taken as objective function, The algorithm optimizes the objective function to realize incremental displacement back analysis of isotropic viscoelastic parameters. The forward analysis of the equivalent rock mass parameters obtained from the inversion and the prediction of the incremental displacement of the surrounding rock caused by subsequent excavation of the plant can further determine the stability of the surrounding rock.