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在满足承载力控制和沉降量控制要求的基础上,采用数值模拟的方法分析最优桩长和桩间距,完成了深层搅拌桩复合地基的优化设计,以达到满足建设需求的同时最大限度地节省建设费用的目的。根据深层搅拌桩复合地基的特点,讨论了复合地基承载力特征值的计算方法,分析了沉降量的构成,对沉降计算方法进行了探讨,并选用单位元法和分层总和法来评价复合地基加固区和下卧层的压缩性。结合深层搅拌桩复合地基的设计要素、承载力、荷载压力、沉降量等指标和具体数值参数,通过设置最优桩长和桩间距来求取满足承载力要求的最小总桩长,并通过编程实现了优化过程。通过程序计算,得到了一组满足地基承载力要求的桩长、基础底面积、置换率的最优数据组合,实现了对深层搅拌桩复合地基的优化设计。
On the basis of meeting the requirements of control of bearing capacity and control of settlement, the optimal pile length and pile spacing were analyzed by numerical simulation, and the optimal design of deep mixing pile composite foundation was completed to meet the construction requirements while saving The purpose of construction costs. According to the characteristics of deep mixing pile composite foundation, the calculation method of bearing capacity of composite foundation is discussed. The composition of settlement quantity is analyzed and the calculation method of settlement is discussed. The composite foundation Reinforced area and under the layer of compression. Combined with the design elements, bearing capacity, load pressure, settlement and other parameters and the specific numerical parameters of deep mixing pile composite foundation, the minimum total pile length to meet the requirements of bearing capacity is obtained by setting the optimal pile length and pile spacing, To achieve the optimization process. Through the program calculation, a group of optimal data combination of pile length, foundation area and replacement rate which meet the requirements of bearing capacity of foundation is obtained, and the optimal design of deep mixing pile composite foundation is achieved.