桩侧桩端后注浆灌注桩水平静载特性研究

doi:10.13722/j.cnki.jrme.2014.0566

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摘要通过分析某地区冲孔灌注桩水平静载试验结果，对桩侧、桩端后注浆技术在冲孔灌注桩承受水平荷载工况下的应用效果进行了试验研究，结果表明：(1) 冲孔灌注桩水平承载力特征值、临界值以及极限值主要取决于桩土之间的相互作用力；(2) 通过比较单桩与后注浆单桩试验结果，后注浆桩基水平临界荷载提高了25%，极限荷载提高了14.3%；(3) 后注浆单桩桩侧土水平抗力系数的比例系数提高了57%；(4) 对于双桩承台，后注浆承台实测值相对比于未注浆承台的计算值，其水平临界荷载值提高了33.7%；(5) 基于各种土层变形模量与桩侧地基土水平抗力系数的比例系数m值的关系，建立了土层变形模量与m值的直线型关系式，并推导出了后注浆桩周土层的复合压缩模量表达式，给出了计算后注浆桩周土的m值计算方法。试验与计算均表明：采用桩侧桩端后注浆技术，可较显著的提高冲孔灌注桩的水平承载力。

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关键词 ：桩基工程, 冲孔灌注桩, 水平静载, 后注浆, 水平抗力, 临界荷载

Abstract：By analyzing the horizontal static load test results of bored piles in certain area，experimental research on application effects for bored piles with pile lateral friction and tip resistance grouting technique are studied. The results show that：(1) The characteristic value，critical value and ultimate limit value of horizontal bearing capacity of bored piles depend mainly on the pile-soil interaction force. (2) By compared with test results of single pile，the critical load with grouting technique is increased by 25% and the ultimate value is increased by 14.3%. (3) The coefficient of pile lateral soil resistance coefficient of single pile with grouting technique is increased by 57%. (4) Compared with the calculated results for two piles cap，the value of horizontal critical load for two piles cap with grouting technique is increased by 33.7%. (5) Based on the relationship between a variety of soil deformation modulus and its m values，a linear equation about deformation modulus and m value is proposed and the expression of grouting soil composite compression modulus is deduced. The calculation method about m value of grouting soil is proposed. Tests and calculation demonstrate that by adopting grouting technique with pile lateral friction and tip resistance，the value of horizontal capacity of bored piles can be improved significantly.

Key words： pile foundations bored piles static load test grouting technique lateral soil resistance critical load

引用本文:

万征，秋仁东. 桩侧桩端后注浆灌注桩水平静载特性研究[J]. 岩石力学与工程学报, 2015, 34(s1): 3588-3596.
WAN Zheng，QIU Rendong. HORIZONTAL STATIC LOAD TEST RESEARCH FOR PILE LATERAL FRICTION AND TIP RESISTANCE OF GROUTING TECHNIQUE. , 2015, 34(s1): 3588-3596.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0566 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3588

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