含倾斜夹层滑坡内抗滑桩和桥基耦合作用的试验与数值模拟

doi:10.13722/j.cnki.jrme.2018.0389

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摘要当滑坡上桥基和抗滑桩的距离较近或较远时，桥基周围土体所产生的剪切变形将严重影响桥基的受力和变形。以成兰铁路右所屯工点为原型，通过模型试验和数值模拟探讨桥基与前、后排抗滑桩的相互作用机制。研究结果表明：倾斜夹层和基岩交界面附近为桩身最大弯矩截面；后排抗滑桩和桥基距离很近，二者相互作用显著，桥基限制了正后方抗滑桩顶部的水平变形，使其受力模式接近锚杆抗滑桩，受抗滑桩水平变形影响，桥基桩后土压力集中在承台附近；后排抗滑桩对桥基周围土体的加固能力大于前排抗滑桩，随着后排抗滑桩和桥基距离的增大，桥基水平位移呈先减小后增大的变化规律，后排抗滑桩和桥基的距离存在一个最佳值，该最佳距离能够有效减小桥基水平位移，前排抗滑桩埋置位置靠近桥基时，才能充分发挥其加固作用。

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	付正道1
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	蒋关鲁1
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	刘琪1
	廖丹1
	王智猛3

关键词 ：边坡工程, 倾斜夹层, 桥梁群桩基础, 抗滑桩, 模型试验, 数值模拟

Abstract：When stabilizing piles are installed close to or far away from the piled bridge foundation in the slope，the shear deformation of soils around the bridge foundation may produce significant lateral loading and cause the deflection of bridge piles. A project on railway line from Chengdu to Lanzhou was investigated experimentally and numerically regarding the interactions between the bridge foundation and stabilizing piles. The results show that the maximum bending moment occurs close to the interface of the intercalated layer and bedrock. Because the rear stabilizing piles are installed so near the bridge foundation，the interaction between them is significant. The bearing mode of rear stabilizing pile installed directly behind the bridge foundation comes closer to the anchor anti-slide pile due to the resistance of the bridge foundation. A major part of the lateral load is concentrated in the pile cap correspondingly. Compared with the front stabilizing piles，the rear stabilizing piles have an obvious advantage to minimize the shear deformation of soils around the bridge foundation. The lateral displacement of the pile cap decreases firstly and then increases with the increasing distance of rear stabilizing piles. There is an optimal location for rear stabilizing piles which can decrease the lateral displacement of the bridge foundation effectively. To make the front stabilizing piles work at full capacity，the piles should be installed near the bridge foundation.

Key words： slope engineering intercalated layer piled bridge foundation stabilizing piles model experiment numerical simulation

引用本文:

付正道1，2，蒋关鲁1，2，刘琪1，廖丹1，王智猛3. 含倾斜夹层滑坡内抗滑桩和桥基耦合作用的试验与数值模拟[J]. 岩石力学与工程学报, 2018, 37(9): 2152-2161.
FU Zhengdao1，2，JIANG Guanlu1，2，LIU Qi1，LIAO Dan1，WANG Zhimeng3. Experiment and numerical simulation on interaction between piled bridge foundation and stabilizing piles in the slope with intercalated layer. , 2018, 37(9): 2152-2161.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0389 或 http://www.rockmech.org/CN/Y2018/V37/I9/2152

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