旋喷静压复合桩竖向抗压承载特性的试验研究 English Version
Experimental study on vertical bearing mechanism of Jet Grouting Jacked Composite Piles
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摘要: 旋喷静压复合桩技术是适用于既有建筑低净空下作业的新型专利技术。通过室内足尺试验对旋喷静压复合桩的竖向抗压承载特性进行研究，并与锚杆静压桩、旋喷桩和钻孔灌注桩的竖向抗压承载特性进行对比。试验结果表明：旋喷静压复合桩主要表现为摩擦桩的特性；当桩径相当时，旋喷静压复合桩的单桩承载力显著高于灌注桩和旋喷桩，锚杆静压桩由于直径较小，单桩承载力也最低；在极限荷载作用下，旋喷桩表现为桩顶材料强度破坏，桩的侧阻力与端阻力未充分发挥，旋喷静压复合桩由于芯桩的植入，弥补了旋喷桩的桩身强度，桩的侧阻与端阻得以充分发挥，其承载力高于旋喷桩；与灌注桩相比，旋喷静压复合桩的桩身呈楔形、桩身界面不规则，旋喷工艺明显改善了桩土的界面特性，旋喷静压复合桩承载力高于同直径的灌注桩。根据试验结果从工程实用的角度，引入侧阻力增大系数和端阻力折减系数，对灌注桩的单桩极限承载力公式进行修正，得到旋喷静压复合桩桩单桩极限承载力的表达式，并给出相关参数的取值建议。Abstract: The jet grouting jacked composite pile is a kind of new patented technology which is suitable to construct under low internal headroom conditions within existing buildings. The vertical bearing mechanism of jet grouting jacked composite piles was studied by indoor full size tests, and contrasted with that of jacked piles, chemical churning piles and cast-in-place piles. The tests show that: the jet grouting jacked composite pile is mainly a kind of friction pile; the vertical bearing capacity of the jet grouting pile is higher than that of the chemical churning pile and the cast-in-place pile with the same diameter, the vertical bearing capacity of the jacked pile is the lowest due to the less diameter; the failure mechanism of the chemical churning pile is strength fracture of pile shaft material on the top of the pile under ultimate load, and the side resistance and tip resistance doesn’t play its roles sufficiently, the pile body strength of the jet grouting jacked composite pile is make up by jacked the core pile in the chemical churning pile, so the side resistance and tip resistance can play its roles sufficiently, therefore the bearing capacity is higher; compared with the cast-in-place pile, the shaft of the jet grouting jacked composite pile is wedge-shaped and the interface is irregular between the pile and soil, the interface shear behavior is improved by grouting, the vertical bearing capacity of the jet grouting composite pile is higher than that of the cast-in-place pile. According to the test results and from an engineering practical point of view, the expression of the vertical ultimate bearing capacity of single jet grouting jacked composite pile is given, which is amended that of single cast-in-place pile by introducing amplification coefficient for side resistance and drawdown coefficient for tip resistance, and the value of relevant parameters is suggested.
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