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在土方开挖工程中，常常发生由于开挖后基坑的坡壁土体在某一坡面产生滑动而下落坍塌的事故。造成这类事故的主要原因：①坡壁太陡或施工单位贪图省工省力，对土方可能坍塌无设防。②施工方法欠妥或不正确。③施工环境与地质条件较差，如施工场地狭小，防护设施不齐全，防护措?
In the excavation of earthwork, accidents of falling and collapsing due to the sliding of soil on the slope wall of a foundation pit after excavation often occur. The main causes of such accidents are: (1) the slope is too steep or the construction unit is trying to save labor and labor, and there is no fortification possible for the earthwork to collapse. ② improper construction methods or incorrect. ③ poor construction environment and geological conditions, such as construction site is small, protective facilities are not complete, protective measures?