【摘要】 莫尔-库仑强度准则的临塑荷载公式由于没有考虑中主应力在强度上的作用使计算结果偏于保守。利用具有线性形式的双剪应力强度准则替换原有的莫尔-库仑强度准则,将中主应力引入临塑荷载的计算中,推导出平面应变条件下考虑中主应力影响的临塑荷载公式,并通过算例说明了新临塑荷载公式的计算结果比原有公式有较大的偏高。更多还原

【Abstract】 The critical edge load, which is defined as the load strength on the ground when the plastic region just appears at the foot of a strip foundation, was proposed based on Mohr-Coulomb strength criterion. A formula of the critical edge load is modified based on the twin shear stress strength criterion, which is a three-dimensional strength criterion expressed in a linear form and is used widely in China now. Compared with the original formula, bigger value of the critical edge load can be calculated by using the modified formula for the effect of intermediate principal stress is considered in plane strain condition.更多还原