拱形抗滑结构模型试验研究  

Model Test Research on Arch Anti-slide Structure

作　　者：邓友生 杨彪 王一雄 彭程谱 李龙[1] 孟丽青 王栋[1] DENG Yousheng;YANG Biao;WANG Yixiong;PENG Chengpu;LI Long;MENG Liqing;WANG Dong(Pile-supported Structures Research and Test Center,Xi’an University of Science and Technology,Xi’an 710054,Shaanxi,China)

机构地区：[1]西安科技大学桩承结构研究中心,陕西西安710054

出　　处：《济南大学学报（自然科学版）》2022年第6期681-688,共8页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51878554,41672308);陕西省自然科学基础研究计划重点项目(2018JZ5012)。

摘　　要：针对拱形抗滑结构治理黄土地区滑坡的适用性,通过3组室内物理模型试验,对比分析拱形抗滑结构的桩后土压力、桩顶位移、桩身弯矩及连梁受力变形特征。结果表明:3种工况下抗滑桩桩后土压力基本一致,呈三角形分布;桩身弯矩的变化规律基本相同,呈先增大后减小再增大的趋势;直线形布置的抗滑桩桩顶切向位移几乎为0,桩顶法向位移最大值为13.56 mm;当采用钢管混凝土桩拱形布置时,桩顶切向位移为1.41 mm,桩顶法向位移为2.65 mm;当采用竹管混凝土拱形布置作为临时救灾抗滑支护结构时,桩顶切向位移为1.55 mm,桩顶法向位移为2.81 mm;采用拱形抗滑结构对桩顶水平位移有较好的约束作用,同时还可改善桩身受力状态。In view of serviceability of arch anti-slide structure in landslide control in loess area, earth pressure behind piles, displacement of pile top, pile bending moment, and deformation mechanical characteristics of coupling beams in the arch anti-slide structure were compared and analyzed through three groups of laboratory physical model tests. The results show that the earth pressure behind anti-slide piles is basically the same under three operating conditions, presenting a triangular distribution. The change law of pile bending moment is basically the same, which increases first, then decreases and then increases. The tangential displacement of anti-slide pile top in linear arrangement is almost 0, while the maximum normal displacement of pile top is 13.56 mm. When the arch arrangement of concrete-filled steel tube piles is used, the tangential displacement of pile top is 1.41 mm and the normal displacement of pile top is 2.65 mm. When the arch arrangement of bamboo pipe piles filled with concrete is used, the tangential displacement of pile top is 1.55 mm and the normal displacement of pile top is 2.81 mm. The arch anti-slide structure can not only restrain horizontal displacement of pile top well, but also improve force state of piles.

关 键 词：拱形抗滑结构 混凝土桩 桩身弯矩 桩顶位移 

分 类 号：TU455[建筑科学—岩土工程]