设置在基坑周边支护（围护）结构（多为桩和墙）顶部的钢筋混凝土连续梁，其作用其一是把所有的桩基连到一起（如钻孔灌注桩，旋挖桩等），防止基坑（竖井）顶部边缘产生坍塌，其二是通过牛腿承担钢支撑（或钢筋混凝土支撑）的水平挤靠力和竖向剪力，冠梁施工时必须凿除桩顶的浮浆等。
石门拱坝拱冠梁的变形特性与常规情况有所差异，但符合其地质情况和坝体构造。
There is some difference in the displacement property in cantilever of Shimen arch dam com pared with general, but it is consistent with its geological condition and dam structure.
以m法为基础，建立了考虑桩顶冠梁效应的挡墙变形计算模型，给出了计算公式。
On the basis of method "m", a model of calculating deformation of DMP retaining wall is presented with effect of beam at the top is considered. A calculating formula is proposed.
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