4、施工时基坑底板的稳定性。三、降水设计1.各土层的物理力学性质指标见下表层物表中各土层物理力学指标(取自岩土工程勘察报告)标(推荐值)土层名称W%GS e IP IL a1-2MPa-1ESMPaφ(°)ckPaKm/d1b素填土24.11.980.70514.00.266.76.60.653-1粘土22.32.030.65117.80.0216.614.23.283-1a粘土25.21.990.72414.40.3211.310.22.014-1卵石21.484.930.95-1全风化泥质粉砂岩21.542.329.62.降水深度要求根据设