A. 以土的临界水力比降除以2.0～2.5的安全系数
B. 对水工建筑物危害较大时，取土的临界水力比降除以2的安全系数
C. 对于特别重要的工程，也可取土的临界水力比降除以2.5的安全系数
D. 通过无黏性土的野外大型渗透变形试验求得
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