模拟洞周松弛圈的地下厂房洞室群开挖变形的反馈分析

Underground Powerhouses Complex Excavation Deformation Inversion Analysis by Simulating Surrounding Relaxation Zone

传统的弹塑性有限元法,不能灵活地模拟洞周松弛圈,难以模拟洞周松弛圈对多点位移计测值的影响。为了克服这一问题,本文引入与开挖面距离和初始地应力有关的单元材料参数松弛系数,对传统有限元方法进行改进,并将其应用于溪洛渡水电站地下厂房开挖与支护的变形监测反馈分析中。将计算所得出的洞室开挖边界附近的位移值与原型观测值进行比较,整体吻合较好,并能够对下级开挖进行良好的预测。

This new method introduces element＇s relaxation coefficient, which relates to the working distance and initial ground stress, and it improves conventional finite- element method. This new method is applied to the monitoring feedback analysis of Xiluodu Power Station＇s underground powerhouses complex. Comparing the calculational displacement with the in - situ measurement value, the feed back results match well. It also can predict the next step excavation primely.