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PullーOut Mechanism of Geogrid in Soil and Its Application to the Design Method of Earth Reinforced Soil Wall

土工格栅在土体中的拉拔机理及其在加筋土墙设计方法中的应用

基本信息

批准号：
01460179
负责人：
OCHIAI Hidetoshi
金额：
$ 2.94万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460179/
关键词：
Polymer grid Pullーout test Retaining wall Sand Finite element method Design Earth pressure Interaction

项目摘要

Earth Reinforcement by using geogrid has been widely applied to soil structures, such as embankments, slopes, retaining wall and foundations, but the design method which evaluates the reinforcing effect properly has not been established.The objectives of this research are to make clear the mechanism of geogridーearthーreinforcement under pullーout forces, to develop an evaluation method of the reinforcing effect, and to establish the design method of the reinforced soil wall. For the purposes, a series of pullーout tests of geogrid in soil was conducted under different relative density of soil. The mechanism of the pullーout resistance of geogrid in soil was clarified by discussing the interaction properties between soil and geogrid from the test results. The mechanism was modeled and formulated as a shearing property in the joint element to take it into finite element method.Main conclusions are summarized as follows :1) Strain distribution on the geogrid in soil is not uniform under pullーout forces, and the corresponding pullーout resistance is the same property, so that the reinforcing effects depends on the relative displacement between soil and geogrid.2) The reinforcing effect was evaluated by finite element analysis which the pullーout mechanism was introduced in the shearing property of joint element.3) From the analysis results of the reinforced soil wall, it was shown that the design papameters were the maximum lateral displacement of the wall, the maximum settlement of the foundation, vertical stress in the foundation and maximum tensile force of geogrid.4) A design method for geogridーreinforcedーsoilーwall, which is based on the charts in terms of the design papameters described above, was proposed.

土工格栅加筋土已广泛应用于路基、边坡、挡土墙、基础等土体结构中，但其加筋效果的评价设计方法尚未建立，本研究的目的是弄清土工格栅加筋土在拉拔力作用下的加筋机理，建立加筋效果的评价方法，建立了加筋土挡墙的设计方法。为此，进行了不同土壤相对密度条件下土工格栅在土壤中的拉拔试验。通过试验结果讨论土壤与土工格栅之间的相互作用特性，阐明了土工格栅在土壤中抗拔力的机理。在有限元分析中，将其作为节点单元中的剪切特性进行建模和表达，主要结论如下：1）在拉拔力作用下，土工格栅在土体中的应变分布是不均匀的，相应的拉拔阻力具有相同的性质，因此加筋效果取决于土体与土工格栅之间的相对位移; 2）通过有限元分析，将拉拔机理引入接缝单元的抗剪性能中，对加筋效果进行评价; 3）从加筋土挡墙的分析结果来看，结果表明，设计参数为墙体最大侧向位移、地基最大沉降、地基竖向应力和土工格栅最大拉力。4）提出了以上述设计参数为基础的土工格栅加筋土挡墙设计方法。