液化面作为累积剪切功的函数，从初始应力点的包络线开始，随着循环活动性的进行，逐渐接近破坏线。
The liquefaction front, originating from the envelope of initial effective stress points, gradually approaches the failure line as the cyclic mobility proceeds as a function of plastic shear work.
在此基础上，建立了基于二次抛物线形抗剪强度包络线的功能函数。
On such a basis, a performance function based on the shear strength envelope curve in the shape of quadratic parabola was established.
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