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【简答题】
基坑坑壁的坡度选择应按确保边坡稳定、施工安全的原则,并符合以下的要求: (1)当在天然土层上挖基,基坑深度在5米以内,施工期较短、基坑底在地下水位以上,土的湿度接近最佳含水量、土层构造均匀时,坑壁的坡度可采用下表中的数值: 坑壁土质 坑 壁 坡 度 基坑顶缘无外载 基坑顶缘有静载 基坑顶缘有动载 砂类土 1 :1 1 :1.25 1 :1.5 碎石、卵石类土 1 :0.75 1 :1 1 :1.25 粘性土、粉土 1 :0.33 1 :0. 5 1 :0.75 极软岩、软岩 1 : 0.25 1 :0.33 1 :0.67 较软岩 1 :0 1 :0.1 1 :0.25 极硬岩、硬岩 1 :0 1 :0 1:0 结合实际情况,本组实训项目坡度采用( )
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