XX建工设计研发大厦室外桩板式挡墙由主楼/M轴开始到培训中心后面。挡墙由ABC段组成，此段边坡坡高为10.2~12.7m，坡长约20m。边坡下部主要为强风化~中风化岩层，上部主要为人工填土约为7.0m，土质边坡陡倾角开挖边坡易发生圆弧滑动破坏。
挡墙基础为5根人工挖孔桩，截面尺寸为1500*1800，桩距为5.0m。平均桩长约为17.0m~19.5m。其中悬空段约4.0m，土层段约4m，岩层段约10m。嵌入中风化完整岩层不小于6.5m。基地岩石天然抗压强度不小于6.3MPa。挡土板受地貌影响设置为梯形，坡度为0.05，高度约为10.0m~13.0m，板厚300mm。
一、工程概况·····································02
二、计划安排·····································02
三、施工方案选择································03
四、施工流程·····································04........