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【多选题】
关于地下水作用的说法，正确的有（ ）。A.
地下水能够软化或溶蚀边坡岩体，导致崩塌或滑坡
B.
采用人工降低地下水位时，如措施不当，则很可能引起地基的不均匀沉降
C.
地下水渗流产生的动水压力大于土颗粒的有效重度时，很可能产生机械潜蚀
D.
当建筑物基础底面位于地下水位以上时，地下水对基础底面产生静水压力即浮托力
E.
如果基础位于节理裂隙不发育的岩石地基上，则按地下水位100%计算浮托力
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