水平向加筋体抗沉陷作用机理分析及设计方法  

Mechanical Performance and Design Method of Horizontal Reinforcement Subjected to Subsidence

作　　者：丁烈梅[1] 郭超祥[2] 

机构地区：[1]山西交通职业技术学院公路工程系,山西太原030609 [2]山西交通职业技术学院工程管理系,山西太原030609

出　　处：《土木工程与管理学报》2016年第3期57-60,67,共5页Journal of Civil Engineering and Management

摘　　要：针对高速公路修筑过程中经常遇到松散、沉陷地基的问题,分析了水平向加筋体加固沉陷区筋材–填土在路堤荷载作用下荷载传递机理。考虑了筋材张拉膜效应和路堤土拱效应在路堤荷载传递中的作用,分别采用薄板理论和Trapdoor理论分析筋材张拉膜效应和路堤土拱效应,推导出水平向加筋体加固沉陷区时最大挠度,并提出设计挠度已知情况下的设计方法。最后采用本文计算方法对工程实例进行计算分析,并综合分析了沉陷区宽度、填土高度、黏聚力、内摩擦角和筋材抗拉模量对水平向增强体设计计算的影响。随着沉陷区宽度的增加,加筋薄板层最大挠度呈非线性增加;随着填土高度的增加,加筋薄板层最大挠度逐渐增加,但增幅不大;随着筋材抗拉模量的增加,加筋薄板层最大挠度逐渐减小。Subsidence ground is a common problem in highway engineering. According to the characteristics of subsidence area reinforced by horizontal reinforcement,the interaction mechanism of geogrid and soil under the embankment load was analyzed. The load transfer of soil arching effect and tensioned membrane effect are considered. The deformation of horizontal reinforced mattress was calculated by the thin plate theory. The soil arching in embankment was calculated by the Trapdoor theory. A mechanical model of subsidence area reinforced by horizontal reinforcement is developed and a design methodology is presented when the deflection is known. The method presented in this paper is used to calculate an engineering example. Then,the factors such as the width of subsidence area,the embankment height,the embankment fill cohesion,the embankment fill friction angle and the tensile elastic modulus,are analyzed systematically. With the increasing of the subsidence area width,the maximum deflection of horizontal reinforced mattress has a nonlinear increase. With the increasing of the embankment height, the maximum deflection of horizontal reinforced mattress increases slowly. With the increasing of the tensile elastic modulus,the maximum deflection of horizontal reinforced mattress keeps descending.

关 键 词：水平向增强体 土拱效应 张拉膜效应 沉陷 路堤 

分 类 号：U416.1[交通运输工程—道路与铁道工程]