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考虑了混凝土芯砂石桩复合地基中砂石桩的环形排水通道、砂石桩体内的径、竖向渗流和土体施工扰动,并采用桩土共同分担荷载的初始条件,得到了混凝土芯砂石桩复合地基固结问题的控制方程,给出了控制方程的解答;并分别给出了复合地基按应力和按变形定义的总平均固结度,分析了砂石桩桩体渗透系数、芯桩与砂石桩直径比对地基固结性状的影响。结果表明:对于混凝土芯砂石桩复合地基按应力定义的固结度与按变形定义的固结度表达式不同;地基的固结随着砂石桩桩体渗透系数增加而加快;砂石桩直径一定的情况下,固结速率随芯桩直径增大先增大后减小。最后对本文解和以往的两种解做了比较,与以往解相比本文解能够同时考虑环形通道和桩土荷载分担,给出的固结度介于以往的两种解之间。
Considering the annular drainage channels of gravel piles, the diameter and vertical seepage flow and soil construction disturbances of the gravel piles in the concrete-filled sand-gravel piles composite foundation, the initial load conditions of the pile-soil are considered, and the concrete core sand The governing equation of the consolidation of stone-pile composite foundation is given, and the solution of governing equations is given. The total average consolidation degree of the composite foundation is given according to the stress and deformation according to the deformation respectively. The permeability coefficient, Influence of Diameter Ratio of Pile and Sand Pile on Consolidation Behavior of Foundation. The results show that the consolidation degree defined by stress and the consolidation degree defined by deformation are different for the concrete-filled sand-gravel pile composite foundation. The consolidation of the foundation accelerates with the increase of the permeability coefficient of the gravel pile body. With a certain diameter, the consolidation rate first increases and then decreases with the increase of core diameter. Finally, compared with the previous two solutions, the solution of this paper can consider the load sharing of the circular channel and the pile-soil at the same time compared with the previous one. The given degree of consolidation is between the two solutions in the past.