论文部分内容阅读
提出了一种考虑土 -桩 -筏相互作用的桩筏基础简化分析法。将群桩中每根桩的桩顶沉降分成桩身压缩和桩端沉降分别计算 ,桩身压缩由单桩静载荷试验或其他方法估算 ,桩端沉降根据分层总和法计算。将桩简化成弹簧作用在筏板下 ,弹簧刚度根据桩顶平均荷载和相应的沉降获得。采用 16节点退化实体等参元对筏板进行有限元分析 ,获得筏板的沉降和内力等。本文方法桩的刚度计算相对简单 ,可以考虑成层地基、地基层厚不均匀等情况 ,沉降计算方法和土性参数确定基本上与“规范”法相同 ,板单元特别适合于平面形状不规则及变厚度的筏板分析。最后 ,将本文的计算结果和其他方法作了对比 ,并介绍了该方法的工程应用。
A simplified method of piled raft foundation considering the soil-pile-raft interaction is proposed. The pile top settlement of each pile in the pile group is divided into the compression of the pile body and the settlement of the pile head. The compression of the pile body is estimated by the static load test of the single pile or by other methods. The pile settlement is calculated according to the stratified summation method. The pile is simplified into a spring under the raft, and the spring stiffness is obtained according to the average load on the pile top and the corresponding settlement. The 16-node degraded solid isometric parametric analysis of the raft is used to obtain the settlement and internal forces of the raft. The method of pile stiffness calculation is relatively simple, can consider stratified foundation, the foundation layer thickness is not uniform and so on, settlement calculation method and soil parameters are basically the same as the “normative” method, plate unit is particularly suitable for the irregular shape of the plane and Variable thickness raft analysis. Finally, the results of this paper are contrasted with other methods, and the engineering application of this method is introduced.