微型桩在路堑边坡加固中的应用及机理分析

发布时间：2018-04-16 10:39

本文选题：微型桩 + 边坡加固　；参考：《铁道工程学报》2017年03期

【摘要】：研究目的:传统抗滑桩采用人工挖孔施工,工期长并且混凝土圬工量大,难以用于路堑边坡快速加固,为此采用钻孔微型桩对广(元)~巴(中)高速公路K51路堑边坡病害进行治理,本文介绍微型桩加固工程概况及设计参数,并采用数值分析手段对带承台微型抗滑桩加固单元的加固机理进行分析。研究结论:(1)作用在微型抗滑桩上的推力近似呈三角形分布,并且微型抗滑桩加固单元内各排桩受力具有不均匀性;(2)侧向挤压作用下各排桩的受力机制差别不大,剪力和弯矩峰值随边界位移不同位置略有差异,模型试验与计算结果均表明,微型抗滑桩加固边坡的破坏模式为沿潜在滑面所产生的整体滑移;(3)承载力分析结果表明,微型抗滑桩加固单元的极限抗滑力大于设计下滑力,表明K51工点边坡选用微型抗滑桩加固方案代替原重力式挡墙是可行的,能够确保被加固边坡的安全;(4)该研究成果可为微型桩在山区边坡(滑坡)加固中的工程应用提供理论指导。
[Abstract]:Research purpose: the traditional anti-slide pile is constructed by manual digging, which has a long construction period and a large amount of concrete masonry, so it is difficult to be used for quick reinforcement of cutting slope.For this reason, this paper introduces the general situation and design parameters of the reinforcement project of the K51 cutting slope of Guangyan-Ba (middle) expressway by using the bored micro-pile.The reinforcement mechanism of micro anti-slide pile with cap is analyzed by numerical analysis.It is concluded that the thrust force acting on the micro-anti-slide pile is approximately triangular distribution, and the stress of each row pile in the micro-anti-slide pile reinforcement unit is non-uniform.The shear force and the peak value of bending moment vary slightly with the boundary displacement. The results of model test and calculation show that the failure mode of the slope strengthened by micro-anti-slide pile is the integral sliding bearing capacity along the potential sliding surface.The ultimate anti-slide force of the micro-anti-slide pile reinforcement unit is greater than the designed sliding force, which indicates that it is feasible to use the micro-anti-slide pile reinforcement scheme instead of the original gravity retaining wall.The research results can provide theoretical guidance for the engineering application of micro-pile in slope (landslide) reinforcement in mountainous area.
【作者单位】：中国矿业大学(北京);中国中铁股份有限公司;中铁西北科学研究院有限公司;
【基金】：国家自然科学基金(51574245,41002090) 中国中铁股份有限公司专项资金项目(2012-重点-44)
【分类号】：U213

【参考文献】