多元复合地基沉降计算方法探讨

以Winkler分布弹簧模拟垫层的作用,考虑垫层、桩和土之间的相互作用;并以Geddes解和Boussinesq解为依据,求出了在单位荷载下网格单元顶部的沉降,即单元的柔度系数;运用弹性理论叠加原理,建立了包括桩顶沉降、土顶沉降及其对应荷载的线性方程组.求解该方程可以进一步求出多元复合地基中主桩、次桩对土的桩土应力比和主桩、次桩及土的荷载分担比.通过工程实例进行分析,表明本文方法的计算结果和现场实测结果符合很好.

Inquiring into the settlement calculation of multi-pile composite foundation

By simulating the cushion with the Winkler spring,the interaction among cushion pile and soil were examined.Based on Geddes solutions and Boussinesq solutions,educed was the settlement at the top of each net on one-unit load,which was regarded as flexible coefficient.The equation including the settlements of pile top and soil top and corresponding loads was established by superposition principle in elasticity theory.Stress ratios of primary pile and secondary pile to pile,and load-sharing proportions of primary pile,secondary pile and soil could be achieved by solving the equation.A practical base of multi-pile composite foundation was studied,which shows that the values calculated using the method presented agrees with the measured data.