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将地下洞室爆破开挖松动区视为一个随开挖过程演变的非均匀、非稳定三维扰动场,松动区内岩体力学参数则是一个具有时空演化特性的参数场。考虑爆破开挖扰动空间效应和岩体真实变形响应,提出了真实工作状态下开挖松动区岩体参数场辨识的位移反分析方法。基于局部监测变形空间插补得到的空间位移场,通过分析洞室爆破开挖围岩变形扰动机制,建立了开挖松动区岩体变形模量参数场数值演化模型,并进行了模型适用性和参数敏感性分析。在此基础上,以变形模量参数为例,结合围岩实测位移信息,提出了开挖松动区参数场位移反分析的动态实现过程。将该方法应用于溪洛渡地下洞室群施工期参数场反演和围岩稳定动态反馈评价及预测,结果表明,该方法合理有效,在大型地下洞群施工开挖与快速监测反馈方面具有显著的工程适用性及实用性。
The loose area of blasting excavation in underground cavern is regarded as a non-uniform and unstable three-dimensional perturbation field evolving with the excavation process. The mechanical parameters of rock mass in loose area are a parameter field with time-space evolution characteristics. Considering the space effect of blasting excavation and the real deformation response of rock mass, a displacement back analysis method of rock mass parameter field identification in loosening area under real working condition was proposed. Based on the spatial displacement field interpolated from local monitoring deformation space, the numerical evolution model of rock mass deformation modulus parameter field is established by analyzing the mechanism of surrounding rock deformation and disturbance during tunnel excavation. The model applicability and Parameter Sensitivity Analysis. Based on this, taking the deformation modulus parameter as an example, combined with the measured displacement information of the surrounding rock, the dynamic process of the inverse analysis of displacement field in the loosening zone of excavation is proposed. This method is applied to the parameter field inversion and the dynamic feedback evaluation and prediction of the surrounding rock stability during the construction of the Xiluodu underground caverns. The results show that this method is reasonable and effective and has significant effects on the construction excavation and rapid monitoring feedback of the large underground caverns. Engineering applicability and practicality.