单项选择题

某墙下条形基础宽度为2.0m，基础埋深0.5m，基底压力pk=160kPa，场地内分布有两层土，上层为粘性土，厚度为2.5m，重度为18 kN/m3，压缩模量Es1=9MPa；下层为淤泥质土，压缩模量Es2=1.8MPa，则软弱下卧层顶面处的附加应力值接近于下列哪个数值（ ） A. 73.9kPa B. 69.7kPa C. 82.8kPa D. 78.1kPa

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