问题 单项选择题

如图所示某碾压土石坝的地基为双层结构,表层土④的渗透系数k1下于下层土⑤的渗透系数k2,表层土④厚度为4m,饱和重度为19kN/m3,孔隙率为0.45;土石坝下游坡脚处表层土④的顶面水龙透为2.5m,该处底板水头为5m。安全系数取2.0,按《碾压式土石坝杀机规范》DL/T5395-2007计算下游坡脚排水盖重层②的厚度不小于下列哪个选项?(盖重层②饱和重度取19kN/m3)()

A.0m

B.0.75m

C.1.55m

D.2.65m

答案

参考答案:C

解析:

【解析】

材料分析题

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请回答:

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(2)结合材料说明,为什么要弘扬和培育抗震救灾精神?

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选择题