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针对传统复合地基内由砂石等透水材料构成的褥垫层在实践中出现的问题,在讨论了复合地基中垫层的作用后提出了双垫层复合地基模型。它在竖向荷载作用下的受力特性与复合桩基相同,可充分发挥复合地基内桩的作用,以显著减少地基的沉降量。提出利用桩土载荷试验资料,通过基础荷载与基底下桩和桩间土抗力平衡的条件来进行双垫层复合地基的变形计算和分析桩土荷载的分担情况。
In order to solve the problem of the mat in the traditional composite foundation consisting of permeable materials such as sand and gravel, the double-cushion composite foundation model was proposed after the effect of the mat in the composite foundation was discussed. Under the action of vertical load, it has the same stress characteristics as the composite pile foundation, which can fully exert the function of the pile in the composite foundation so as to significantly reduce the settlement of the foundation. Based on the test data of pile and soil load, the deformation calculation of double-cushion composite foundation and the analysis of the load sharing of pile-soil under the condition of basic load and balance of soil resistance between foundation pile and pile are put forward.