粉喷桩多桩复合地基沉降因素的数值分析

利用有限单元法对粉喷桩多桩复合地基进行数值模拟，通过对荷载大小、垫层厚度、垫层模量、桩长径比以及桩距等影响因素的分析，得出在整个加荷期间粉喷桩多桩复合地基沉降随着这些因素变化而变化的规律：随着荷载的增加，粉喷桩复合地基沉降呈现了非线性的增长势态；褥垫层越厚，桩间土的沉降越大，厚度应控制在300mm左右且其模量不应过大；随着桩长的逐渐增加，桩侧摩阻力发挥得就越明显，桩土有共同的沉降趋势；随着桩间距的增加，导致桩间土沉降的非线性趋势更加明显。

Numerical analysis of the settlement factor of the Multi-DJM-Pile composite foundation

By using the finite element method(FEM), the numerical emulation experiments are carried out on the settlement of the multi-DJM-pile composite foundation. The load thickness and modulus of the cushion , the ratio of the pile’s length and diameter and the spacing between piles are analyzed, and the rules of the settlement of the multi-DJM-pile composite foundation during the whole loading period are obtained. The settlement of the multi-DJM-pile composite foundation increase nonlinearly increment with the load increasing. The thicker the cushion, the large the settlement of the soil between piles, at the same time the thickness of the cushion should be controlled in about 300mm and its modulus should be limited strictly. The side resistance of pile plays a more important role and the settlement of the pile and the soil has the same tendency while the pile’s length. The increment of the spacing between piles results in the obviously nonlinear settlement of the soil between piles.