论文标题:夯实水泥土桩复合地基可靠度分析
Reliability Analysis of Composite Foundation of Rammed Soil-Cement Piles
论文作者
论文导师 刘春原,论文学位 硕士,论文专业 结构工程
论文单位 河北工业大学,点击次数 441,论文页数 58页File Size14885k
2006-01-01论文网 http://www.lw23.com/lunwen_452972/
composite foundation of rammed soil-cement piles;reliability;finite element method;transmission pattern of load
自夯实水泥土桩复合地基技术研究开发以来,由于其提高承载力的幅度大、地基变形小、施工速度快、无污染、造价低等特点,在工程实践中得到了广泛的应用。虽然应用广泛,但是由于各种原因,对夯实水泥土桩复合地基的研究仅限于设计、施工、承载力、变形等方面,而对于其可靠度方面的分析研究却很少。针对这种现状,本文首先应用ANSYS有限元分析软件对夯实水泥土桩复合地基的荷载传递规律进行了分析,并将计算结果与相应的静载试验进行了对比分析。在此基础上,建立了夯实水泥土桩单桩竖向承载力极限状态方程,探讨了一维随机场变量的统计规律,编制了相应的可靠度计算程序。最后,对收集到的石家庄、辛集地区的几个工程分别进行了可靠度计算,并对计算结果进行了分析,初步验证了河北省工程建设标准《水泥土桩复合地基技术规程》DB13(J)14-2003中夯实水泥土桩复合地基的承载能力极限状态对应的可靠度指标为2.6。
Because of the characteristics of large bearing capacity, small subbase deformation, rapid construction velocity, pollution-free and low cost, the composite foundation of rammed soil-cement piles are applied broadly in engineering practice. But owing to some reasons, researches about the composite foundation are limited to the following aspects, such as design, construction, bearing capacity, deformation and so on. The number of studies about its reliability is very small. So, firstly, the dissertation analyzed the transmission pattern of load by ANSYS, and compared the computational results with the experimental results. And then, the limiting state equation of single pile"s vertical bearing capacity was built, the one-dimension random field variables" statistical regularity was studied, and a relevant reliability calculation procedure was programmed. Finally, the dissertation calculated the reliabilities of several projects in Shijiazhuang and Xinji, analyzed the results, and roughly verified that the reliability index was 2.6, which was corresponded to the limit state of bearing capacity of composite foundation of rammed soil-cement piles in Technical Rules for Composite Foundation of Cement-soil Piles DB13(J) 14-2003.
|
