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

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,以有效地节约工程造价,提高整体经济效益。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。

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.