地下空间施工时内部损伤监测的计算机方法

Computer Method for Inner Damage Monitoring during Excavation of Underground Space

地下洞室施工时围岩损伤场的动态监测对裂隙岩体的安全施工相当重要。利用多元分布参数拟合逼近理论建立损伤场的映射拟合函数反演法 ,以识别与监测围岩损伤的演化。将分布参数系统用若干正交函数族的乘积描述 ,通过量测的位移值反演分配系数以确定损伤的函数分布形式 ,还探讨了拟合项数对反演精度的影响问题以及时变反演与工况。

Dynamic damage monitoring of cracked rock mass during construction is very important for the safety. The fitting function back analysis method for damage field is established by using multi variant distributed parameter approximation theory, which can be used to identify and monitor the evolution of adjacent rock damage. The distributed parameter system is described by multiplying several orthogonal functions. The form of damage function distribution is determined by the distributed parameters through back analysis of the measured displacement. The accuracy of back analysis affected by different fitting function term number is studied as well. The time varying back analysis, step and final work back analysis are compared and analyzed.