粉土地区螺杆桩承载特性的研究

发布时间：2018-04-27 12:25

本文选题：螺杆桩 + 承载特性　；参考：《河南工业大学》2017年硕士论文

【摘要】：桩基发展使用久远,新桩型不断涌现,例如长螺旋灌注桩、预制管桩、水泥土桩、螺纹桩、螺杆桩等。螺杆桩作为一种新型的变截面异型桩,上部直杆段,下部螺纹段,相比于普通灌注桩,不仅施工速度快、造价费用低、承载力高,还兼具了环保无污染等优点。但是到目前为止,螺杆桩的相关理论研究远滞后于工程实际应用,这极大地阻碍了螺杆桩的发展使用。本文在总结前人研究的基础上,通过理论分析,结合河南省某实际工程,借助有限元模拟软件对螺杆桩的承载特性进行了分析,主要着手的研究工作如下:(1)总结了桩基的发展历程,对螺杆桩的发展、研究现状以及螺杆桩施工时的一系列问题做了简要的归纳,并从不同的角度对螺杆桩相比于其他桩型的优势进行了总结。(2)分析了桩基荷载传递的一般规律、螺杆桩桩身荷载的传递特点,并总结了单桩极限承载力的确定方法。对影响螺杆桩承载力的因素进行了分析,通过桩土破坏理论推导了螺杆桩单桩极限承载力的计算公式,结合实际工程与常用的螺杆桩承载力简化计算方法进行对比分析。(3)以河南省三门峡市某工程使用的螺杆桩为背景进行静载荷试验,整理分析试验数据,并通过与理论计算的单桩承载力进行了对比分析,验证了螺杆桩具有较高的承载力。最后通过试验桩的低应变检测工作对桩体的完整性进行检测,保证螺杆桩的正常使用。(4)基于有限元模拟软件ABAQUS对本工程的试验桩进行模拟试验,并与实际试验数据进行对比分析。以本工程试验桩为例,用ABAQUS软件模拟不同桩型参数情况下螺杆桩单桩承载能力和应力分布的变化,通过对比分析,找出最适合本工程螺杆桩的桩型参数。为河南省粉土地区类似工程提供参考。
[Abstract]:The pile foundation has been developed for a long time, and the new type of pile is constantly emerging, such as long spiral cast-in-place pile, prefabricated pipe pile, cement soil pile, screw pile, screw pile and so on. As a new type of variable cross section pile, the upper straight bar section, the lower thread section, compared with the ordinary cast-in-place pile, not only has fast construction speed, low cost, high bearing capacity, and has both environmental protection and no environmental protection. But up to now, the research on the theory of screw pile is far behind the practical application of the engineering, which greatly hinders the development and use of screw pile. On the basis of summarizing the previous research, this paper, through theoretical analysis, combined with a practical project in Henan Province, carries out the bearing characteristics of the screw pile with the aid of the finite element simulation software. The main research work is as follows: (1) the development process of the pile foundation is summarized, the development of the screw pile, the current research status and a series of problems in the construction of screw pile are briefly summarized, and the advantages of the screw pile to other pile types are summarized from different angles. (2) the general law of the load transfer of the pile foundation is analyzed. The transmission characteristics of the load of the screw pile are summarized, and the determination method of the ultimate bearing capacity of the single pile is summed up. The factors affecting the bearing capacity of the screw pile are analyzed. The calculation formula of the ultimate bearing capacity of the single pile of the screw pile is derived by the pile soil failure theory, and the proportion of the actual engineering and the simplified calculation method of the common bearing capacity of the screw pile is carried out. (3) 3) take the screw pile used in a project in Sanmenxia of Henan Province as the background to carry out static load test, arrange and analyze the test data, and compare the bearing capacity of the single pile with the theoretical calculation, and verify the high bearing capacity of the screw pile. Finally, the integrity of the pile body is detected by the test of the low strain test of the test pile. To ensure the normal use of the screw pile. (4) based on the finite element simulation software ABAQUS, the test pile of this project is simulated and compared with the actual test data. Taking this engineering test pile as an example, the variation of the bearing capacity and stress distribution of single pile of screw pile under different pile type parameters is simulated with ABAQUS software, and the score is compared. To find out the most suitable pile type parameters for the screw pile of this project, and provide reference for similar projects in Henan silty area.

【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU473.1

【参考文献】