铁路高陡路堑边坡综合加固方案研究  

The Study of Complex Reinforcement for High-steep Railway Cut Slope

作　　者：杨栋林 

机构地区：[1]中国水电建设集团国际工程有限公司,北京100048

出　　处：《铁路工程造价管理》2016年第1期5-10,共6页Railway Engineering Cost Management

摘　　要：铁路高陡路堑边坡一直是工程防护的重点,此文分析了边坡发生滑塌失稳的机理。采用Flac3D程序和Mohr-Coulomb准则,计算坡体在未加固条件下的变形、受力情况。计算表明,坡体存在明显的弧形塑性剪切破裂带,水平位移过大,边坡发生滑塌。为保证边坡的安全稳定,依据其工程地质特点和失稳机理,选用自预应力锚杆、钢筋混凝土挡墙、挂网喷射混凝土及预应力锚杆压力注浆多种加固形式的综合治理方案,并分析加固措施的力学机理。采用相同计算方法分析上述加固方案,并与边坡未加固时作对比分析。研究表明,边坡加固后坡体剪应变增量明显减少,该方案合理有效,提高了边坡稳定性,对类似工程支护设计具有重要参考意义。High- steep railway cut slope mechanism of slope. The fast is the key point of the engineer protection, we analyzed the instability Lagrangian analysis of continua in 3 dimensions （ Flac3 D） numerical calculation program and Mohr- Coulomb constitutive model are adopted to make analysis of the deformation and force condition of the slope on the case of unreinforced slope. The results show that there is a clear arc - plastic shear rupture zone in the slope, horizontal displacement is too large, and the slope slid. In order to ensure stability of the slope, according to the engineering geology characteristics and failure mechanism, a comprehensive reinforcement design has been done, including prestressing bolt, reinforced concrete retaining wall, sprayed concrete, and high - pressure cement grouting. Then analyze the me- chanical mechanism of reinforcement measures. The mechanical behavior of the slope with applying a- bove supporting scheme is analyzed by using the same numerical simulation. And compare with the unre- inforced slope. Studies show that after reinforcement, the slope of shear strain increment reduces significantly, horizontal displacement reduces, the scheme is reasonable, slope stability improves. So the research results are of significance as a reference for similar engineering.

关 键 词：铁路 路堑边坡 加固结构 稳定性 

分 类 号：U213.158[交通运输工程—道路与铁道工程]