卸载状态下与周围土体共同作用的冻结壁力模型

基于冻结壁处于卸载状态这一客观事实,提出“卸载状态下冻结壁－周围土体共同作用”的冻结壁力模型。卸载状态用解除应力的等儿应力替代岩土原始应力来表达。在此基础上,导出了周围土体和冻结壁弹塑性区应力、应变状态的解析表达式,并得到冻结壁外载的计算公式和确定塑性区大小的方程。该模型从本质上反映了冻结壁的卸载状态及其对周围土体的共同作用。

A mechanical model of interaction of frozen soil wall and surrounding earth mass in unloaded state

According to the fact that frozen soil wall stands in a situation of unload, a mechanical model of "interaction of frozen soil wall and surrounding earth mass in unloaded state" is presented. Unloaded state is expressed by means of replacing the initial stress with the equivalent stress of relieving stress, based on which analytic expressions of stress strain state of surrounding earth mass, elastic and plastic zones in frozen wall are deduced. In addition, a formula for calculation of the load on frozen soil wall and an equation for determination of the size of the plastic zone are given. This model reflects essentially the unloaded state of frozen soil wall and its interaction with surrounding earth mass.