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某一黏性土层,根据6件试样的抗剪强度试验结果,经统计后得出土的抗剪强度指标的平均值为φm=17.5°,

cm=15.0kPa;并算得相应的变异系数δφ=0.25,δc=0.30。根据《岩土工程勘察规范》(GB 50021—2001),则土的抗剪强度指标的标准值φk,ck分别为()。

A.φk=13.90°,ck=11.3kPa

B.φk=11.40°,ck=8.7kPa

C.φk=15.30°,ck=12.8kPa

D.φk=13.10°,ck=11.2kPa

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