BEARING MECHANISM AND CAPACITY OF PEDESTAL BORED PILE COMPACTED COLUMN-HAMMER
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摘要: 混凝土扩底灌注桩是JGJ 942008《建筑桩基技术规范》推荐使用的桩基型式,柱锤夯实扩底灌注桩是混凝土扩底灌注桩技术的新发展。与现有扩底桩技术相比,柱锤夯实扩底灌注桩具有施工简便、承载力提高幅度大的优点。其承载力提高主要来源于以下两个方面:一是通过夯填干硬混凝土形成夯扩体,二是通过桩底填料夯实挤密桩端持力层。通过对柱锤夯实扩底灌注桩的承载机理进行研究,提出柱锤夯实扩底灌注桩单桩承载力计算公式,可供工程设计参考应用。Abstract: Pedestal concrete pile is by Technical Code of Building Pile Foundation.(JGJ 942008), which is a new development of concrete pedestal pile technology.This new kind of pile has the advantage of higher bearing capacity and simpler driving procedure.The higher bearing capacity derives mainly from two aspects: one is the rammed dry concrete base and the other is the compacted end bearing stratum by fillers.The bearing mechanism of this pile was expounded and practical formula of calculating bearing capacity of single pile was proposed.
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JGJ 792002 建筑地基处理技术规范[S]. [2] DB13(J)/T 1402012 柱锤夯实扩底灌注桩技术规程[S]. [3] CQB 20011 柱锤夯扩灌注桩技术规程[S]. [4] JGJ 942008 建筑桩基技术规范[S]. [5] 王恩远,刘熙媛.锤冲扩桩法加固机理研究[J].建筑科学,2008,24(9): 63-68.
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