mass excavation meaning in English

大面积开挖
大体积开挖

By simulating the excavation course of foundation pits and starting with the change of stress field , the regularities of remanent strength and static earth pressure of viscous soil mass under excavated plane are analyzed so that the influence depth due to soil mass excavation unloading may be determined
摘要模拟基坑开挖过程，由应力场变化方面入手分析开挖面以下粘性土体残余强度和静止土压力的规律性，以期确定土体开挖卸荷的影响深度。