循环荷载作用下水泥土桩复合地基的临界循环应力比和永久变形分析

Analysis on critical cyclic stress ratio and permanent deformation of composite foundation improved by cement-soil piles under cyclic loading

摘要: 通过循环荷载作用下水泥土桩复合地基的室内模型试验,考虑复合地基的垫层、加固层以及下卧层的相互作用,研究了循环荷载作用下水泥土桩复合地基的竖向永久变形发展情况,考虑了复合地基的固结状态、循环应力比的大小及加荷频率对竖向永久变形的影响,得到了水泥土桩复合地基的临界循环应力比和竖向永久变形随加荷周数、加荷频率和固结状态而变化的规律,对于控制复合地基的工后沉降具有重要的参考价值。

Abstract: Through model tests on composite foundation of cement-soil piles under cyclic loading,and with interaction of cushion,reinforced zone and sublayer being taken into account,the vertical permanent deformation of composite foundation of cement-soil piles under cyclic loading was studied and the influences of consolidation states,cyclic stress ratio and vibration frequency were considered.The variation rule of critical cyclic stress ratio and vertical permanent deformation with numbers of loading cycles,vibration frequency and consolidation states were obtained.These results were siginificant to control the settlement of composite foundation.