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以某炼钢厂房的桩筏基础设计为工程背景,采用Mindlin和Boussinesq弹性理论计算桩土刚度,Reissner厚板理论分析桩基筏板,并利用该方法对转炉桩基础和厂房柱基础共同组成桩筏体系的总体沉降、差异沉降、桩顶反力、筏板内力等结果进行了计算。此法较现有的桩基设计规范中基于筏板绝对刚性假定的计算方法有一定的优越性。通过分析计算结果总结变化规律,发现荷载密度对此类基础的局部沉降、桩顶反力影响较大。
Based on the engineering design of piled raft foundations in a steelmaking plant, the pile-soil stiffness was calculated by Mindlin and Boussinesq elastic theory. Reissner slab theory was used to analyze pile rafts. The pile foundation and plant foundation were combined to form pile The total settlement of the raft system, the differential settlement, the reaction force at the top of the pile and the internal force of the raft are calculated. This method has some advantages over the existing calculation method based on assumption of raft absolute rigidity in the pile foundation design code. By analyzing and calculating the results and summarizing the changing rules, it is found that the load density has a great influence on the partial settlement and the reaction force of the top of such foundation.