微型抗滑桩加固边坡极限抗力研究

发布时间：2018-03-16 06:26

本文选题：微型抗滑桩　切入点：边坡加固　出处：《铁道工程学报》2017年07期 　论文类型：期刊论文

【摘要】：研究目的:微型抗滑桩具有桩位布置灵活、施工速度快、对施工场地适应性强、对环境影响小等优点,近年来在边坡加固领域得到广泛应用和推广,但目前缺乏分析微型抗滑桩加固边坡极限抗力的科学方法。基于此,本文采用数值分析手段建立微型抗滑桩加固边坡的极限抗力分析模型,以桩身弯曲承载力、剪切承载力和结构位移为控制条件,提出一种微型抗滑桩加固边坡极限抗力的分析方法,并进行力学机制研究。研究结论:(1)不同类型边坡微型抗滑桩提供的极限抗力有所不同,岩土强度越高微型抗滑桩提供的极限抗力越大,整体而言,对于土质边坡,微型抗滑桩的极限抗力主要受桩身弯曲承载力控制;对于岩质边坡,微型抗滑桩的极限抗力主要受剪切承载力控制;(2)滑坡推力主要由靠近荷载的半幅桩承载,远离荷载的半幅桩基本不受力;(3)微型抗滑桩与岩土的接触反力主要由靠近荷载桩单元的正应力提供,剪应力的影响不大;(4)该研究成果可为微型抗滑桩在边坡加固工程中的设计和安全评价提供理论依据。
[Abstract]:Research purpose: micro anti-slide pile has the advantages of flexible arrangement of pile position, fast construction speed, strong adaptability to construction site and small impact on environment, and has been widely used and popularized in the field of slope reinforcement in recent years. However, there is a lack of scientific method to analyze the ultimate resistance of the slope strengthened by micro-anti-slide pile at present. Based on this, a numerical analysis method is used to establish the ultimate resistance analysis model of the slope strengthened by the micro-anti-slide pile, and the bending bearing capacity of the pile body is used. Under the control condition of shear bearing capacity and structural displacement, this paper presents an analytical method for the ultimate resistance of the slope strengthened by micro-anti-slide pile, and studies the mechanical mechanism. The conclusion of the study is that the ultimate resistance provided by the micro-anti-slide pile of different types of slope is different. The higher the strength of rock and soil, the greater the ultimate resistance provided by micro-anti-slide pile. As a whole, for soil slope, the ultimate resistance of micro-anti-slide pile is mainly controlled by the bending bearing capacity of pile body, while for rock slope, the ultimate resistance of micro-anti-slide pile is mainly controlled by the bending bearing capacity of pile body. The ultimate resistance of miniature anti-slide pile is mainly controlled by shear bearing capacity. The contact reaction between the micro-anti-slide pile and the rock and soil is mainly provided by the normal stress near the load pile element. The research results can provide theoretical basis for the design and safety evaluation of micro-anti-slide pile in slope reinforcement engineering.
【作者单位】：中国矿业大学(北京);中国中铁股份有限公司;
【基金】：国家自然科学基金项目(51574245) 中国中铁股份有限公司专项资金项目(2012-重点-44)
【分类号】：TU472

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