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介绍了刚柔桩同体组合技术的加固原理,同时介绍了其与劲性搅拌桩的不同点。刚柔组合桩单桩及复合地基的荷载传递机理与劲性搅拌桩及长短桩复合地基有所不同,存在荷载扩散的双层模式。研究了桩侧摩阻力和桩端阻力发挥的不同影响因素,当进行刚柔组合桩单桩极限承载力计算时需考虑插入管桩对水泥土搅拌桩的挤密作用、管桩同心植入水泥土搅拌桩中形成土塞效应、水泥土搅拌桩与预应力管桩协调变形情况,结合国内外类似桩型承载力计算公式,给出刚柔组合桩单桩承载力和复合地基承载力计算公式。分别采用平均附加应力法、Boussinesq-Mindlin应力解联合求解法进行路堤荷载下刚柔组合桩复合地基的沉降计算,经实例验证后者具有较好的适用性。
The reinforcement principle of the rigid-flexible piles combination technique is introduced, and the difference between the rigid-flexible piles and the stiff mixing piles is introduced. The load-transfer mechanism of rigid-flexible combined pile-single pile and composite foundation is different from that of stiffened mixing pile and long-short pile composite foundation. There is a double-layer mode with load diffusion. The influence factors of pile friction and pile tip resistance are studied. When calculating the ultimate bearing capacity of rigid-flexible composite piles, the squeezing action of the inserted pipe piles on the cement-soil mixing piles must be considered. The cement piles Soil mixing pile formed in the plug effect, coordination of cement-soil mixing pile and prestressed pipe pile deformation, combined with similar abroad at home and abroad bearing capacity of the formula, give the rigid and flexible composite pile capacity and composite foundation bearing capacity formula . The average additional stress method and the Boussinesq-Mindlin stress solution method are used to calculate the settlement of composite foundation with rigid-flexible composite piles under embankment load. The example shows that the latter method has good applicability.