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【多选题】
桩产生负摩阻力时，下列说法正确的是（）。A.
桩距越大，下拉荷载可能越大
B.
桩身轴力、桩身沉降沿深度逐步衰减
C.
单桩极限承载力由桩总侧阻力和桩端阻力所组成
D.
采用涂层法措施后，可使桩身负摩阻力、沉降减小，但中心点深度变大
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