摘要
研究目的:微型桩具有施工简便、施工快速、布置灵活、抗滑能力较强的特点,在山区边坡(滑坡)加固中得到了广泛的应用。基于钢管微型桩加固边坡的破坏实例,采用有限元方法进行反分析,对钢管微型桩的极限抗滑力进行研究。研究结论:对于采用了桩顶连系梁的钢管微型桩组合结构而言,桩后滑坡推力呈上部大、中间小、下部大的"U"型分布形式;桩前土体抗力呈上部大下部小的倒三角形分布。钢管微型桩组合结构(四排钢管桩+连系梁)的极限抗滑力为596 kN,单根钢管微型桩的平均极限抗滑力为149 kN。在实际工程中,可采用改良桩间土、桩前设置支撑结构、优化结构布置形式等工程措施来提高钢管微型桩的抗滑能力。
Research purposes： Micro -pile construction has been widely used in the reinforcement in the mountains slope （landsllde） with the feature of simple, rapid construction, layout flexibility and strong skid resistance. Based on the failure examples of steel pipe micro - pile reinforcement slope, using finite element method to research the limit sliding resistance of steel pipe micro - pile through back analysis. Research conclusions：This study showed that, for the steel pipe micro - pile that using pile - cap - beam combined structure, the landslide - thrust distribution back of the pile is big in the end and small in the middle performance ＂U＂ type distribution form; Soil resistance before the pile is big top and small bottom performance inverted triangular distribution. Limit sliding resistance of steel pipe micro - pile composite structures （ four row of steel pipe pile ＋ contact beam） is 596 kN, single steel pipe micro -pile average limit sliding resistance for 149 kN. In practical projects, these engineering measures can be used to improve the anti - sliding ability of steel pipe micro - pile such as modify between pile soil, setting support structure before pile, optimize structure distribution form, and so on.
出处
《铁道工程学报》
EI
北大核心
2012年第9期45-48,共4页
Journal of Railway Engineering Society
关键词
微型桩
极限抗滑力
有限元
顺层边坡
micro - pile
limit sliding resistance
finite element
bedding slope
