开巷初期临时支护压力预测的新方法

A new prediction method of the pressure of early temporary support

应用边界罚单元（ 弹簧元） 与有限元相结合， 计算了开巷初期巷道周边应力集中的大小及其分布状态， 把复杂的边界条件转化为增加一个新单元（ 边界弹簧元） 的问题来处理， 并使新单元在结构上和原有单元处于同等地位， 为开巷初期预测临时支护压力， 进行临时支护的设计提供了参考．

Combined the boundary punition element (spring element) with the finite element and stress distribution around the periphery of a tunnel in the initial period of tunnel excavation are calculated.With boundary spring element,complicated boundary condition can be changed into another guestion added with a new element that is on the same position as original elements.It presents a new way for pressure prediction of early pressure of temporary support which is an important reference of support design in the initial period of tunnel excavation.