In this paper,the recycled aggregate from building waste is used to reinforce the pile,and the numerical simulation is applied to reinforce the Loess foundation.In this study,a group ring model and a single pile model are established in Shaanxi.The single pile model is 8.2 m long,wide 4.2 m,deep 12.5 m,and the single pile model is restrained by the ground and the side.Numerical simulation results show that as the load increases,the total settlement of the pile is increasing,the indoor model test and numerical simulation of settlement curves obtained are compared with the same trend,and the settlement of each load is close to the value,under the same load,with the increase of loess layer depth,soil in composite foundation the stress ratio decreases gradually.Under the condition of soil modulus between different piles,the variation trend of stress ratio of pile-soil in composite loess soil is different,among which the displacement of pile 1 is the largest,followed by the displacement of pile 3,and the displacement of pile 2 is the least.%以建筑垃圾再生骨料制备成加固桩,对其应用于黄土地基的加固进行了数值模拟研究.本研究以陕西某绕城高速公路为研究对象,建立群桩模型和单桩模型,其中单桩模型,模型长8.2m,宽4.2m,深12.5m,对单桩模型地面和侧面进行约束.数值模拟实验表明,随着荷载的增大,各桩的总沉降量也随着增大,室内模型试验和数值模拟沉降得到的曲线比较吻合,具有相同的趋势,且每个荷载对应的沉降值非常接近,在相同荷载作用下,随黄土层深度的增加,复合黄土地基桩土应力比逐渐减小.在不同桩间土模量条件下,复合黄土地基桩土应力比的变化趋势有一定差别,其中桩1位移最大,其次是桩3的位移,桩2的位移最小.
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