条形荷载下加筋路堤边坡模型试验研究

发布时间：2018-07-01 17:32

本文选题：加筋路堤边坡 + 变形特征　；参考：《铁道工程学报》2015年07期

【摘要】：研究目的:随着我国经济与交通运输业的快速发展,加筋土技术将越来越多的应用在路堤的修建中,用来提高路堤的承载力与稳定性并控制路堤变形。本文对未加筋、水平加筋、立体加筋黏性土路堤边坡进行多组模型试验,主要研究不同加筋形式、立体加筋不同竖筋高度对路堤边坡极限承载力、坡顶竖向沉降、坡面水平位移、筋材受力与边坡破裂面形态的影响,探讨两种加筋形式路堤的工作机理和加固机制。研究结论:(1)采用立体加筋方式对提高边坡极限承载力,控制坡顶竖向沉降与坡面水平位移的作用比采用水平加筋方式效果明显;(2)随着立体筋材竖筋高度的增加,边坡的极限承载力随之提高,坡顶竖向沉降与侧向位移也随之减小;(3)在相同加筋层数和加筋位置情况下,水平加筋与立体加筋形式下的筋材拉力分布规律基本相同,但立体筋材所受的拉力比水平筋材的大,即立体筋材能更好地发挥筋材的承载能力;(4)不论是水平加筋还是立体加筋路堤,其破裂面形态不同于未加筋时的连续圆弧破裂带,而是被筋条隔断为多个圆弧面,新产生的圆弧破裂面曲率增大,作用位置也更靠近路堤中部;(5)该研究结论可为加筋路堤边坡的设计和施工提供参考和技术支持。
[Abstract]:Research objective: with the rapid development of economy and transportation in China, reinforced earth technology will be used more and more in the construction of embankment, to improve the bearing capacity and stability of embankment and to control the deformation of embankment. In this paper, multi-group model tests are carried out on unreinforced, horizontally reinforced, three-dimensional reinforced clay embankment slopes. The main research is about the ultimate bearing capacity of embankment slope, vertical settlement of the top of the embankment, different reinforcement forms, different vertical reinforcement height, and so on. The working mechanism and strengthening mechanism of two reinforced embankments are discussed in this paper. The conclusions are as follows: (1) the effect of vertical settlement and horizontal displacement of slope is better than that of horizontal reinforcement, and (2) with the increase of vertical reinforcement height, the ultimate bearing capacity of slope is improved by three-dimensional reinforcement. With the increase of the ultimate bearing capacity of the slope, the vertical settlement and lateral displacement of the slope also decrease. (3) under the same reinforcement layer number and reinforcement position, the distribution law of the tensile force of the steel bars in the form of horizontal reinforcement and three-dimensional reinforcement is basically the same. However, the tensile force of the three-dimensional reinforcement is greater than that of the horizontal reinforcement, that is, the three-dimensional reinforcement can better exert the bearing capacity of the reinforced material. (4) whether the horizontal reinforcement or the three-dimensional reinforced embankment, the shape of the rupture surface is different from that of the continuous arc rupture zone without reinforcement. Instead, the reinforced strip is separated into several arcs, the curvature of the newly produced arc rupture surface is increased, and the action position is closer to the middle of the embankment. (5) the research conclusion can provide reference and technical support for the design and construction of reinforced embankment slope.
【作者单位】：兰州交通大学陕西铁路工程职业技术学院
【基金】：长江学者和创新团队发展计划(IRT1139)
【分类号】：U416.1;U213.1

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