土工合成材料缓冲层减压膨胀土挡墙侧向压力的实用预测方法研究  

A practical approach for predicting lateral pressures on expansive soil retaining walls with geosynthetic inclusions

作　　者：樊科伟 邹维列[2] 王柳江[3] 廖洁 刘斯宏[3] FAN Ke-wei;ZOU Wei-lie;WANG Liu-jiang;LIAO Jie;LIU Si-hong(Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education,Hohai University,Nanjing,Jiangsu 210098,China;School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,Jiangsu 210098,China;College of Civil Engineering,Sanjiang University,Nanjing,Jiangsu 210012,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]河海大学水利水电学院,江苏南京210098 [4]三江学院土木工程学院,江苏南京210012

出　　处：《岩土力学》2023年第11期3182-3190,共9页Rock and Soil Mechanics

基　　金：国家重点研发计划(No.2022YFE0105000);国家自然科学基金项目(No.52308349);江苏省自然科学基金项目(No.BK20230967);江苏省卓越博士后计划(No.2023ZB830);江苏省高等学校自然科学研究项目(No.23KJB560022)。

摘　　要：回填膨胀土吸水至饱和状态时,土工合成材料缓冲层减压膨胀土挡墙墙后侧向压力的预测方法,对减压膨胀土挡墙的设计至关重要。假定膨胀土变形由吸水膨胀变形和外力压缩变形组成,以弹性理论为基础推导了膨胀土弹性模量和膨胀力的计算公式,公式参数通过膨胀土有荷膨胀试验确定;基于减压挡墙中回填膨胀土吸水至饱和时土工合成材料缓冲层与回填膨胀土间相互作用关系与变形协调条件,建立了一种土工合成材料缓冲层减压膨胀土挡墙侧向压力的实用预测方法。根据土工袋缓冲层减压膨胀土挡墙和土工泡沫板缓冲层减压膨胀土挡墙模型试验结果,对提出的预测方法进行了验证,结果表明通过预测方法得到的计算结果与模型试验中实测结果具有良好的一致性。The development of a prediction method for the lateral pressure exerted on expansive soil retaining walls with geosynthetic inclusions has been identified as vital for the design of such structures when saturation of the backfilled expansive soil is achieved.It is assumed that the deformations of expansive soil are composed of swelling deformation due to water absorption by the soil and compression deformation induced by external loads.Within the tenets of elasticity,equations were devised to estimate the elastic modulus and swelling force of expansive soil,respectively.Parameters for these equations were determined through the swelling tests on the expansive soil with loadings.Based on the interaction relationship between the geosynthetic inclusions and the backfilled expansive soil,a practical prediction method for the lateral pressure exerted on expansive soil retaining walls with geosynthetic inclusions was developed when the expansive soil reached saturation,and its performance was fully validated by model tests of the expansive soil retaining wall with soilbag and expanded polystyrene geofoam(EPS)inclusions,respectively.It was observed that the lateral pressures calculated using the proposed method exhibited a well agreement with experimental measurements.

关 键 词：土工合成材料 膨胀土 挡土墙 侧向压力 实用预测方法 

分 类 号：TU473[建筑科学—结构工程]