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首次在大型储罐基础下采用了大直径刚性桩桩网复合地基设计,对大直径刚性桩桩网复合地基的设计、数值模拟分析、优化设计进行了详细的论述。根据计算分析,采用刚性桩桩网复合地基可大幅度减小基础的沉降、不均匀沉降,对储罐基础进行充水预压沉降监测,揭示采用三维有限元计算结果同实际测试结果较为接近。在储罐下桩顶承台上、桩间土安装土压力计,根据实测值得出桩土分担比。采用大直径刚性桩桩网复合地基,相对传统桩筏基础节省投资60%以上,节省工期50%以上。
For the first time, the design of large-diameter rigid pile-net composite foundation is adopted under the large tank foundation. The design, numerical simulation and optimization design of the large diameter rigid pile-net composite foundation are discussed in detail. According to the calculation and analysis, using rigid pile-net composite foundation can greatly reduce foundation settlement and uneven settlement, and carry out water-filled preloading settlement monitoring on the foundation of the tank, revealing that the results obtained by using the three-dimensional finite element method are close to the actual test results. In the tank under the pile cap platform, soil pressure gauge installed between the piles, according to the measured value derived from the pile-soil sharing ratio. The use of large diameter rigid pile-net composite foundation saves more than 60% of the investment cost of traditional piled raft foundation, saving more than 50% of the construction period.