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灌注桩后压浆法技术使桩底沉渣形成高强度新土层并强化桩底持力层,使得坐落于埋深较浅但厚度大的碎卵石层或强风化软质岩层上的灌注桩达到了超长嵌入埋深大的硬质岩灌注桩的同等效果,能有效缩短工期,减少费用。但注浆实施过程中对注浆压力的控制是后压浆法的重要措施,过大的注浆压力将对桩身以及桩侧土层产生抬升效应并将导致拱起破坏。基于工程实践,探讨分析灌注桩后压浆法对桩身和桩侧土层的抬升效应机理,推导出注浆压力控制的相关解答,有效指导工程应用,表明嵌入软质岩并进行后压浆法处理的灌注桩承载力和变形能够满足设计要求,盲目增加桩长和加大嵌岩深度是没有意义的,给今后同类型工程提供理论基础。
Grouting post-grouting technique makes the pile bottom sediment form high-strength new soil layer and reinforces the bottom bearing layer, so that the bored pile located on the shallow buried but thick crushed gravel layer or strong weathered soft rock layer reaches Long embedded in the same depth of hard rock bored piles the same effect, can effectively shorten the construction period and reduce costs. However, the control of grouting pressure in the process of grouting is an important measure of the post-grouting method. Excessive grouting pressure will cause a lifting effect on the pile body and the pile-side soil and will cause the arch collapse. Based on the engineering practice, the mechanism of jacking effect on pile and pile side soil after grouting piles is analyzed and discussed, and the relevant solutions of grouting pressure control are deduced, which can effectively guide the engineering application. It indicates that embedding soft rock and post-grouting The method of bearing capacity and deformation of cast-in-place pile can meet the design requirements. It is pointless to increase the pile length blindly and increase the depth of embedded rock, which will provide the theoretical basis for the same kind of project in the future.