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摘要：
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劲芯搅拌桩是由搅拌桩和钢筋混凝土芯桩组合而成的新型桩,具有高承载力、低造价、施工便捷等优点,为掌握其荷载传递机理和承载力影响因素,进行了19根桩的荷载试验,包括11根劲芯水泥搅拌桩、4根钻孔灌注桩及4根水泥搅拌桩;并对劲芯搅拌桩进行了有限元分析。研究表明:芯桩对劲芯搅拌桩的荷载传递起关键作用,提高了劲芯搅拌桩的承载力;劲芯搅拌桩的承载力高于水泥搅拌桩和钻孔灌注桩;芯桩的长度、体积含芯率、面积含芯率存在一个最优值;水泥土的固化效应、芯桩的挤土效应和芯桩的荷载传递是劲芯搅拌桩高承载力的主要来源。
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A mixing pile with stiffness core(MPSC) is a new pile made up of a cement mixed pile with a reinforcedconcrete core.The pile has advantage of high capacity,low cost and quick construction.To master its loadtransfer mechanism and bearing capacity,19 piles were tested for their loading capacity,including 11 mixing pileswith stiffness cores,4 bored cast-in-situ piles and 4 cement mixed piles,and FEM analysis were made for mixingpiles with stiffness cores.The following results are obtained.The RC core pile(RCCP) plays a critical role in loadtransfer of mixing pile with stiffness core and improves the high bearing capacity of the mixing pile;the bearingcapacity of mixing piles with stiffness core is higher than that of the cement mixed piles and bored cast-in-situpiles;there is a optimal value in the core-pile length,the core-pile volume rate and the core-pile area core rate fora mixing pile with stiffness core;the main sources of high capacity are the solidification effect of the cement-soilmixture,the soil displacement effect of the RCCP and the load transfer of the RCCP.
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基金项目：
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国家自然科学基金资助项目(59978028、E0803)
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作者简介：
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参考文献：
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