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【单选题】
挡土墙6m高，墙背竖直、光滑，墙后填土面水平，若填土的c＝0，φ=20°，地下水位在地表处，γsat＝20.6kN/m³，则作用在挡土墙墙背上的主动土压力的合力为多少？A.
180.81kPa
B.
60.27kPa
C.
30.87kPa
D.
92.61kPa
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A.
无灯光显示
B.
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C.
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D.
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