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采用三维有限元程序建立了一长为6 m、直径为0.8 m的加筋碎石桩复合地基流固耦合数值模型,分析了其在堆载和孔压消散过程中的荷载传递和变形特性。较传统碎石桩,加筋碎石桩复合地基桩土应力比显著增大,超孔压、沉降和桩身侧向变形显著减小,且随筋材刚度的增大,其性能进一步改善。加筋碎石桩复合地基在桩间土固结过程中产生明显的桩土差异沉降,形成土拱效应,使得堆载结束后桩土应力比变化很小。筋材长度对加筋碎石桩复合地基桩土应力比和沉降影响显著,应对其全长加筋才能保证桩体刚度和有效减少沉降。
A three-dimensional finite element program was used to establish a numerical model of fluid-solid interaction for a 6 m-long, 0.8-m diameter reinforced gravel pile composite foundation. The load transfer and deformation characteristics of the composite foundation during its displacement and pore pressure dissipation were analyzed. Compared with the traditional gravel pile and the reinforced gravel pile composite foundation, the pile-soil stress ratio obviously increases, the excess pore pressure, settlement and lateral deformation of the pile body decrease significantly. And with the increase of the rigidity, the performance of the pile is further improved. Reinforced stone column composite foundation in the consolidation process between the soil produced significant differential settlement of soil and piles, the formation of soil arching effect, so that after the end of the pile pile stress ratio changes very small. The length of the reinforcement has a significant effect on the pile-soil stress ratio and settlement of the reinforced gravel pile composite foundation, so as to ensure its rigidity and reduce the settlement effectively.