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混凝土芯砂石桩复合地基由竖向增强体混凝土芯砂石桩、水平加筋砂石垫层和地基土共同组成,是一项将砂石桩良好的排水固结特性、预制混凝土桩高强度竖向承载和加筋垫层应力扩散调整功能进行有机结合而成的新技术,适合于处理高含水率深厚淤泥质软土地基。结合实际工程应用围绕混凝土芯砂石桩复合地基的变形和承载力两大特性开展了大量的现场观测和原位测试,研究分析了高填土路堤荷载作用下混凝土芯砂石桩复合地基的表面沉降、分层沉降、深层水平位移、桩土应力分布、桩身荷载传递规律、强度和承载力特性等,进一步揭示了混凝土芯砂石桩复合地基的加固机理,对工程设计与施工具有重要指导意义。
The concrete core sand-gravel pile composite foundation is composed of a vertically reinforced concrete core sand pile, a horizontally-reinforced gravel cushion and a foundation soil, which is a combination of good drainage consolidation characteristics of the gravel pile, high strength of the precast concrete pile, Vertical bearing and reinforced cushion stress dispersion adjustment function of organic combination of new technology, suitable for processing high water content of deep silt soft soil foundation. A large number of on-site observations and in-situ tests were carried out based on two major characteristics of the deformation and bearing capacity of concrete-filled sand-gravel piles composite foundation in practical engineering. The surface of the composite foundation with concrete-filled gravel piles under high fill embankments Settlement, stratification and settlement, deep horizontal displacement, stress distribution of pile and soil, load transfer law of pile body, strength and bearing capacity characteristics further reveal the reinforcement mechanism of concrete-filled sand-gravel pile composite foundation and have important guidance to engineering design and construction significance.