坑式托换的桩尖达到持力层后压桩力应达到规定的单桩竖向承载力标准值的()倍,且持续时间

题型:单项选择题

问题:

坑式托换的桩尖达到持力层后压桩力应达到规定的单桩竖向承载力标准值的()倍,且持续时间不应小于5min。

A.1.0 

B.1.5 

C.2.0 

D.2.5

考点:注册土木工程师岩土工程专业知识专业知识
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D.条件(1)充分,条件(2)也充分.

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