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水泥土插芯组合桩荷载影响范围

Building Technique Development(2022)

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Abstract
采用足尺试验的方法,研究了水泥土插芯组合桩在竖向加载模式和水平加载模式下对桩周土沉降或位移的影响范围.共设置了3根试验桩,其中外围水泥土桩直径800 mm,芯桩直径400 mm,芯桩采用C35混凝土通长填芯.竖向加压静载试验时,在距离桩中心0.9 m、1.9 m、3.9 m处分别对称设置了12处沉降标;水平静载试验时,在桩前距离桩中心0.5 m、0.7 m或0.8 m、1.0 m处分别设置了水平位移测试点.在竖向荷载作用下,对距离桩中心2.5D范围内的桩侧土影响较明显,超出该距离后对桩侧土影响较小,可忽略不计.在水平荷载作用下,临界荷载时,桩前不同位置处土体水平位移随土体至桩心距离的增大基本呈线性减小趋势,当土体至桩心距离超过2.5D时,该位置处的土体水平位移为零.试验结果表明,设计布桩时其中心距不宜小于2.5D.
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