锚索与桩共同加固边(滑)坡的设计方法探讨  

Discussion of the Design Method for Slope(Landslide) Reinforced by Cable Anchors and Piles

作　　者：蒋楚生[1] 邹川 黄献璋 李庆海[1] 司文明[1] 许颖 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2017年第12期6-8,23,共4页Journal of Railway Engineering Society

摘　　要：研究目的:预应力锚索和桩经常被联合使用在滑坡或者高边坡的加固设计中。由于锚索适应能力强,具有深层主动加固、随机补强、柔性好、施工快捷等特点,在高边坡预加固和滑坡治理中已经成为一种不可替代的措施。但是,现有的计算方法和设计规范一般仅列出了直线型滑面的计算公式,对于锚索和桩联合使用的设计没有给出非常明确的计算方法。目前,大多数规范只是对于一种单一的直线型(顺层)滑面给出了计算方法,而实际工程中的绝大部分非直线型滑面,多为折线型或者圆弧型滑面,由于没有直接的计算公式,使得设计者无法采用比较合理的方法来分析桩和坡面锚索的联合受力。往往是设计者凭借自身的工程经验进行工作,大概地分摊一定的推力给锚索和桩,而没有精确去考虑各自的作用,缺乏一定的科学基础。基于此,本文对此类经常被联合使用在滑坡或者高边坡加固中的措施的设计方法进行探讨。研究结论:(1)本文从边坡稳定系数与剩余推力的计算入手,根据现行规范的公式,演绎推导出折线型滑面的安全系数及锚索与桩各自承担的推力;(2)其他形式的滑面均可以先简化为折线型滑面,从而实现比较合理的设计;(3)本文提出的计算方法可以推广应用到铁路、公路等领域。Research purposes： The prestressed cable anchors and piles are often used in the design of high slope or landslide reinforcement. Cable anchors have become an irreplaceable measure in high slope reinforcement and landslide treatment because their adaptability, with deep active reinforcement, random reinforcement, good flexibility, convenient construction, etc. However, the existing calculation methods and design codes generally only list the calculation formula of a linear sliding surface, without a clear calculation method for the cable anchors and piles combination design. At present, most of the specifications only give calculation method for a single straight （bedding） surface. In practical engineering, the vast majority of sliding surfaces are non linear, and more for the broken line or arc surface. Because there is no formula directly, the designer can not analyze the joint force of anchor pile and slope using reasonable methods. The design works often relies on designers own engineering experience, lacking certain scientific basis. In this paper, the design methods of these measures which are usually used in landslide or high slope reinforcement were discussed. Research conclusions： （ 1 ） In this paper, starting with the calculation of slope stability coefficient and residual thrust, according to current specification formula, safety factor of broken line sliding surface and thrust undertaken separately bycable anchors and piles were deduced. （2） Other forms of sliding surface can all be simplified as broken line sliding surface, thus realizing reasonable design. （3） The calculation method proposed in this paper can be applied to railway, highway and other fields.

关 键 词：预应力锚索 滑坡 折线型滑面 边坡稳定系数 剩余推力 

分 类 号：U418.52[交通运输工程—道路与铁道工程]