水泥土搅拌桩复合地基优化设计探讨

Optimal Design for Composite Ground of Mixed Soil-Cement Pile Research

深层搅拌形成的水泥土桩体,有其固有的荷载传递规律,其变形、破坏特征与钢筋混凝土桩有很大的差异,传统的确定混凝土桩承载力的方法,已难以准确地确定水泥土桩的承载力。同时,采用单桩载荷试验与复合地基载荷试验,对水泥土桩的受力变形的影响亦不完全相同,造成评价的结果亦有很大出入。探讨并优化复合地基的设计方法,利于提高设计水平,以有效的节约工程造价,提高整体经济效益。本文结合工程实例,详细介绍了水泥土搅拌桩的设计过程,并对基础平面尺寸及桩长的优化设计进行了探讨,供参考使用。

Deep stirred cement-soil pile, which has its intrinsic load transferring pattern, is quite different from steel-concrete pile in the aspect of deformation and destruction. Traditional method of determining bearing capacity of steel-concrete pile can not be used for cement-soil pile. Meanwhile, load test of composite foundation is different from load test of single pile in the aspect of deformation impact on cement-soil pile, which may result in great difference of assessment, The study on optimal design for composite foundation of stirred cement-soil pile is useful for improving design and reducing project cost. The design process of stirred cement-soil pile is introduced in detail and engineering cases are provided. Also the optimal design for pile length and foundation size is discussed.