第33卷第3期 2016年5月
土木工程与管理学报 Joumal of Civil Engineering and Management
Vol. 33 No. 3 May 2016
水平向加筋体抗沉陷作用机理分析及设计方法
丁烈梅"，郭超祥”
（山西交通职业技术学院a公路工程系；b.工程管理系，山西太原030609）
摘要：针对高速公路修筑过程中经常遇到松散、沉陷地基的间题，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Trapdor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圈沉陷区时最大挠度，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，但增辐不
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。关键调：水平向增强体；土拱效应；张拉膜效应；沉陷；路提
中图分类号：U416.1
文献标识码：A
文章编号：2095-0985(2016)03-0057-04
Mechanical Performance and Design Method of Horizontal Reinforcement Subjected to Subsidence
DING Lie-mei", GUO Chao-xiang
(a. Department of Highway; b. Department of Engineering Management, Shanxi Traffic Vocational and Technical College, Taiyuan 030609, China)
Abstract: 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 efect 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 fll 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.
Key words: horizontal reinforcement; soil arching effect; tensioned membrane effect; subsidence;
embankment
修建高速公路时，由于洞穴、潜蚀、管道腐蚀以及喀斯特地形等原因，工程建设中经常遇到地
基中局部沉陷基至空润的情况，在这种不良地基上修筑路堤时，为了节约成本和方便施工，通常采
收稿日期：2015-11-11修回日期：2015-12-22
作者简介：丁烈梅（1971-），女，山西晋中人，副教投，硕士，研究方向为路基路面工程（Email；sxjt_jgc@126.com）
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