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采用大型有限元软件ABAQUS,对不同褥垫层模量、厚度、短桩模量及基础上不同的荷载对刚柔性长短桩复合地基的长桩与土的应力比、短桩与土的应力比、长短桩应力比、基础沉降的影响及其规律进行了分析.数值分析表明:垫层的存在增大了地基的沉降,可调节复合地基中桩土应力的分配;随着垫层模量的增加,长桩桩身应力增加,短桩应力减小;增加短桩的刚度,复合地基的沉降减少;随着基础顶面荷载的增加,桩土应力比增大,位移差也增大.结合武汉某住宅小区的长短桩静载荷的现场监测数据,分析了工程中长桩与土、短桩与土、长短桩应力比的变化规律.数值分析和现场监测数据分析结果可为该类型地基的设计和施工提供依据.
Using the large-scale finite element software ABAQUS, the stress ratios of long piles to soil and the ratio of the short piles to the soil for the rigid flexible long-short-pile composite foundations are calculated for the different cushions modulus, thickness, short-pile modulus and different loads. The stress ratios of long and short piles, the effects of foundation settlement, and their laws are analyzed. Numerical analysis shows that the presence of cushions increases the settlement of the foundation and can adjust the distribution of pile-soil stress in composite foundations; with the cushion modulus With the increase, the stress of the long piles increases and the stress of the short piles decreases; the stiffness of the short piles increases, and the settlement of the composite foundation decreases; with the increase of the load of the foundation top, the stress ratio of piles and soils increases, and the displacement difference increases. The on-site monitoring data of static load of long and short piles in a residential community in Wuhan analyzes the variation of the stress ratio of long-pile and soil, short-pile and soil, and long-short-pile piles in engineering. Numerical analysis and field monitoring data analysis results can be used for this type of foundation. Design and construction provide the basis.