土工格栅加筋地基荷载试验研究  

Experimental Plate Loading Test Study of Geogrid Reinforced Soils

作　　者：李启徽 郑志刚 LI Qihui;ZHENG Zhigang(Ronghua Construction Group Co.Ltd.,Jinan 250000;Shandong Tianqi Real Estate Group Co.Ltd.,Zibo 255022)

机构地区：[1]荣华建设集团有限公司,济南250000 [2]山东天齐置业集团股份有限公司,山东淄博255022

出　　处：《土工基础》2024年第6期1085-1087,1092,共4页Soil Engineering and Foundation

摘　　要：为探究土工格栅加筋地基的承载力和变形特征,设计开展了模型试验。以一组无筋工况作为对照,设计了5层、7层和16层土工格栅加筋方案,对比了各加筋方案下的地基沉降、水平土压力和水平位移,探讨了加筋机理。结果表明:无加筋工况下,在荷载超过400 kPa后地基表面沉降陡然大幅增加,表现出了明显的脆性破坏特征。取无筋工况达到地基极限荷载值400 kPa下的沉降作为对比,5层加筋工况达到此沉降荷载为505 kPa, 7层加筋工况为565 kPa, 16层加筋工况为660 kPa,各加筋方案在同一沉降位置处地基承载力分别提高了26%、39.5%和63.5%,地基沉降改善较为显著。通过土工格栅加筋,减小了土体水平土压力和水平位移,且同等水平土压力下水平位移较无筋工况亦有明显改善,体现了良好的加筋性能。To explore the bearing capacity and deformation characteristics of geogrid reinforced foundations,this paper designs and performs model tests with 5.7 and 17 layers of geogrid reinforced foundations.The settlement,lateral earth pressures and horizontal displacement of the reinforced earth soils are compared with the performance of natural soil with reinforcement.The results indicate that,for soil without the reinforcement,the surface soil settlement increases significantly after the foundation pressure greater than 400 kPa,the the soil demonstrates an obvious brittle failure mode.Using the same settlement magnitude at an ultimate bearing capacity of 400 kPa as the reference value,the bearing capacity for 5 layers of geogrid reinforcement is 505 kPa,565 kPa for 7 layers and 660 for 16 layers of reinforcement,respectively.Under the same settlement value,various reinforcement layers of geogrid increase 26%,39.5%and 63.5%,respectively.The foundation soil receives a significant improvement.After the geogrid improvement,the lateral earth pressures,horizontal displacement are reduced comparing with the natural soil without the soil reinforcement.

关 键 词：土工格栅 模型试验 地基沉降 水平位移 

分 类 号：TU411[建筑科学—岩土工程]