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为研究桩承式加筋地基作用机制及影响加筋效果的因素,设计天然软土地基、土工格栅加筋地基、桩承式地基、桩承式加筋地基4组模型试验,通过对试验结果的对比,分析阐述桩承式加筋地基的作用机制。同时,将三维数值模拟的结果与试验结果进行对比验证,在此基础上采用三维流固耦合的数值模型研究影响桩承式加筋地基处理效果的因素。研究结果表明,4组试验中,桩承式加筋地基加载板的沉降量最小,承载力最大;桩承式加筋地基的桩土应力比大于同样荷载条件下的桩承式地基;随着桩间距的增大,桩承式加筋地基表面沉降逐渐增大,桩土应力比逐渐减小;随着格栅模量的增加,桩承式加筋地基表面沉降逐渐减小,桩土应力比逐渐增大。
In order to study the mechanism of piles reinforced foundation and the factors affecting the reinforcement effect, four models of natural soft soil foundation, geogrid reinforced foundation, piled foundation and piled reinforced foundation were designed. The comparison of the results shows that the mechanism of the pile-supported reinforced foundation is analyzed. At the same time, the results of three-dimensional numerical simulation are contrasted with the experimental results. Based on this, the numerical model of three-dimensional fluid-solid coupling is used to study the factors affecting the effect of pile-supported reinforced foundation treatment. The results show that in the four tests, the subsidence of pile-loading foundation is the smallest and the bearing capacity is the largest; the pile-soil stress ratio of pile foundation is greater than that of pile-supported foundation under the same load condition; With the increase of pile spacing, the settlement of pile foundation is gradually increased, and the stress ratio of pile to soil is gradually reduced. With the increase of the modulus of the pile, the settlement of pile foundation is gradually reduced, the pile stress Than the gradual increase.