深基坑开挖所采用的围护结构形式（1）重力或混凝土档土墙。此种形式靠墙身自重产生的抗倾覆力矩大于倾覆力矩取得。重力式挡土墙一般宽度较宽为An左右，基坑厂县开挖，主体内应力失去平衡，基坑土体产生回弹上隆，从而造成墙体下部主体不稳定，在软土的蠕变作用下，会引起墙体 Enclosed structure adopted for deep excavation (1) Gravity or concrete retaining wall. In this form, the anti-overturning moment generated by the weight of the wall is greater than the overturning moment. Gravity retaining wall is generally wider than the width of An, the excavation of foundation pits and factories and counties, the internal stress of the main body is out of balance, and the soil of the foundation pit produces a rebound and uplift, which results in the instability of the lower part of the wall body and the creeping of the soft soil. Under the action, it will cause the wall