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小直径钢管排桩水平极限承载力现场试验研究

DOI: 10.3969/j.issn.1674-0696.2015.01.17, PP. 78-83

Keywords: 岩土工程,滑坡,小直径钢管桩,原型试验,水平承载力,桩间土,getechnicalengineering,landslides,smalldiametersteelpipepiles,prototypetest,horizontalbearingcapacity,soilbetweenpiles

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Abstract:

:?以某滑坡工点作为堆载试验场地进行小直径钢管排桩原型结构堆载破坏试验,获取了不同组合结构的水平荷载-位移曲线。加载试验中,钢管排桩在荷载增大至一定限值,变形曲线出现拐点,达极限破坏时,桩顶出现大变形,桩间土局部溜出破坏,但钢管桩未发生整体垮塌或溃屈破坏。按照慢速维持荷载法,确定了两排桩、三排桩不同间排距结构的水平极限承载能力。试验表明:钢管排桩通过桩体与桩间土相互作用形成复合承载体系,承载能力较不考虑桩间土的排架结构大幅提高,其承载能力影响因素包括排架结构强度、钢管桩排数及合理间排距等。

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