建筑垃圾复合地基的试验与数值仿真分析

Experimental and Numerical Simulation Analysis on Construction Waste Composite Foundation

为研究建筑垃圾复合地基的承载性能,自制大型固结仪对某工程中利用建筑垃圾进行路基处理的土样、单桩及复合地基进行室内压缩试验,并通过工程现场静载试验对其承载力进行检测,利用有限元软件对不同桩径、桩长、弹性模量的建筑垃圾复合地基进行数值模拟.结果表明:建筑垃圾复合地基能显著提高软弱土路基的压缩模量,提高其承载力;增大建筑垃圾散体材料桩桩径可以显著提高路基承载力,减小路基沉降;改变桩长及桩身模量对提高软弱土路基承载力和降低路基沉降的效果并不明显.因此,建筑垃圾复合地基可以应用于软土路基处理中.

To study the bearing capacity of construction waste composite foundation,the indoor compression test of the soil of construction waste is made in a project,the single pile and composite foundation are tested by the self-made large consolidometer,and the bearing capacity is examined through the engineering field static load testing,then the different pile length, pile diameter, composite foundation construction waste of elastic modulus was numerically simulated by using the finite element software. The results show that: The construction waste composite foundation can significantly improve the compression modulus of soft soil roadbed and its bearing capacity; Increasing construction waste of granular material pile diameter has significant effect on the reduction of the subgrade settlement and improve the bearing capacity of subgrade; The effect of the change of pile length and pile modulus on the improvement of subgrade settlement and bearing capacity is not obvious. Therefore, the construction waste composite foundation can be applied to soft roadbed treatment.