土工格栅加筋砂土地基性能模型试验研究

Study of model test on performance of soil foundation reinforced by geogrids

正确评价土S-格栅加筋砂土的地基性能，是进行土工格栅与土之间相互作用分析以及为工程设计、计算与分析确定参数的基础．通过模型试验，对静载条件下土工格栅加筋砂土地基性能进行了研究．由模型试验测量结果得知，在砂土地基中铺设塑料土工格栅，可以使承载力提高10％～40％、侧向位移量减少20％～50％、地基轴线处竖向沉降减少30％～50％．通过比较分析认为，对于条形浅基础加筋地基，最佳加筋层数为2～3层，加筋长度应为基础宽度的3倍．

As a key step for analyzing interaction between soil and geogrid and for defining parameters used in analysis and calculation as well as engineering design, the rational evaluation of the ultimate bearing capacity of soil foundation reinforced by geogrids is of practical significance. The properties of sand ground reinforced with geogrid were studied through model test. The results show that the ultimate bearing capacity can be increased 10%-40% and the lateral displacement and vertical settlement can be decreased 20%-50% and 30%-50% respectively, if the sand foundation is reinforced by geogrid. For the strip shallow foundation, the best reinforced geogrid layers are 2-3 layers and the best length of reinforced geogrid is 3 times of the width of the foundation.