筋箍碎石桩复合地基桩土应力比及沉降计算  

Pile-Soil Stress Ratio and Settlement Calculation of Geosythetic-encased Stone Column

作　　者：李歆[1] 

机构地区：[1]湖南省交通科学研究院,湖南长沙410015

出　　处：《公路工程》2016年第6期209-213,共5页Highway Engineering

摘　　要：深入研究筋箍碎石桩复合地基受力变形机理,考虑碎石桩桩身在荷载作用下的弹塑性变形,利用胡克定律与摩尔库伦弹塑性材料的剪胀特性,同时引入可考虑埋深效应的桩间土围限力与径向位移的折线模型,从而提出了不同荷载水平下,筋箍碎石桩复合地基加筋段与非加筋段桩身受力与变形的关系,并基于分层总和法,提出了筋箍碎石桩主管泥土应力比与沉降计算方法。最后,通过以工程算例验证了方法的合理性,并探讨了筋材刚度与荷载水平对桩土应力比的影响,结果表明加筋套筒有效增加了碎石桩的刚度,桩土应力比随荷载的增大,呈先增大后减小的趋势。This paper considered the elasto-plastic deformation of geosythetic-encased Stone Column,using the Hooke＇s law and the shear dilatancy character of elasto-plastic material of Mohr-Coulomb theory, and bringing in the broken-line model which could consider the buried depth effect of confined force and radial displacement between pile and soil at the same time,then put forward a computing method of stone-encased column＇ s pile-soil stress ratio and settlement. Finally, validating the rationality of this method through to the engineering examples, and investigating the effect of reinforcement stiffness and horizontal load on the pile-soil stress ratio. The results show that the reinforcement sleeve is effective to increase the stiffness of the gravel pile, the pile-soil stress ratio increases with the load.

关 键 词：筋箍碎石桩 复合地基 径向位移 弹塑性变形 桩土应力比 沉降 

分 类 号：TU473[建筑科学—结构工程]