微型桩组合结构模型抗滑机制试验研究  

Model test study of anti-sliding mechanism of micro-pile combined structure

作　　者：刘鸿[1,2] 周德培[1] 张益峰[1] 

机构地区：[1]西南交通大学岩土工程系,成都610031 [2]四川理工学院建筑工程学院,四川自贡643000

出　　处：《岩土力学》2013年第12期3446-3452,3458,共8页Rock and Soil Mechanics

摘　　要：对以空间桁架微型桩体系的组合结构采用了分级加载的方法,通过新的地质力学模型试验,研究滑坡推力引起的微型桩体系内力变化规律,并根据试验方法和空间桁架微型桩体系中各排桩的受力状态,导出了分级加载条件下受横向约束的弹性地基梁的结构分析解。试验结果表明,在碎石土地质条件下,连系梁可以有效限制微型桩顶位移,并减小桩身弯矩,滑体中桩前土压力分布相对较为均匀,各排微型桩桩体的弯矩大小分布比较接近,最大弯矩位于滑面处;基于受到横向约束的弹性地基梁的结构分析解,可以较好地描述空间桁架式微型桩在分级加载后的内力变化及其分布规律。研究结果对正确分析微型桩的抗滑机制和微型桩抗滑设计具有较好的参考价值。Adopting the step loading method on combined structure of spatial truss micro-pile system as supporting structure, the changing law of internal force of micro-pile system is studied by new geological mechanics model test. According to the test methods and the state of force of the space truss micro-pile system, the structural analysis solution which is under the conditions of step cyclic loading and based on the elastic foundation beam constrained laterally is deduced. The test results show that, under the conditions of the broken-rock soil, the link beam can effectively limit the micro displacement of pile top; and the moment of pile body reduced; the soil pressure distribution in front of the pile is relatively uniform in sliding body; the distribution of the moment of each row of micro-piles is relatively close to each other; the maximum moment is close to the sliding face. The structural analysis solution based on the elastic foundation beam constrained laterally deformation can describe the changing law of internal force and distribution rule of micro-pile system after step cyclic loading better. The research results have a good reference value for correct analysis of anti-sliding mechanism and anti-sliding design of the micro-pile.

关 键 词：微型桩组合结构 模型试验 抗滑机制 

分 类 号：TU42[建筑科学—岩土工程]