盘坡角对水平力作用下扩盘桩土体破坏状态影响研究
发布时间：2018-10-13 15:15
【摘要】：混凝土扩盘桩作为一种新型桩,如今越来越受人们重视,它由等截面混凝土灌注桩发展而来。通过在桩身的不同位置设置承力盘,从而使普通直桩变为变截面端承桩,同时桩的受力机理也发生了变化。其特点是具有承载力高,沉降变形小的优点,因此具有较好的发展前景。目前,关于混凝土扩盘桩的研究虽然已经取得了不少成果,但仍然处于发展的初步阶段,其在竖向承载性能方面的研究已经有较多积累,但在承受水平荷载作用机理的研究十分有限,由于一直以来桩基的水平承载力都比较受到人们的重视,因此一定程度影响了这种优秀桩型的广泛应用。混凝土扩盘桩与普通直桩最大的不同之处便是存在承力扩大盘,由于在设置承力盘时具有灵活可变性,比如承力盘个数、承力盘间距、承力盘直径和坡角等等,因此对承力盘参数的研究具有实际意义。为了更好的指导工程实践,本文将借助有限元模拟和原状土小比例半面桩试验法研究盘坡角对水平力作用下扩盘桩土体破坏状态的影响。在软件模拟方面,通过ANSYS软件建立不同承力盘坡角的分析模型,对模拟结果进行应力和位移分析,比较结果,初步分析出了不同承力盘坡角对桩身位移、土体破坏状态的影响和较为合适的坡角设计值;同时为了可以观察桩周土的破坏情况进行小模型试验,此期间进行桩周土破坏状态的和桩顶位移值的记录,经整理分析后与软件模拟部分进行对比,最终确定了不同承力盘坡角对桩周土的破坏形态和合理的承力盘坡角,并且根据桩周土体的破坏状态进行了扩盘桩水平承载力的分析。通过本文的研究能够定性地确定了混凝土扩盘桩在水平荷载下的桩土破坏特征,和承力盘坡角的大小对其承受水平荷载的影响,完善了混凝土扩盘桩的理论基础,有助于对该型桩的进一步研究和在今后大规模应用在实际工程中。
[Abstract]:As a new type of pile, concrete expanded disc pile is paid more and more attention by people. It is developed from the equal section concrete cast-in-place pile. By setting a bearing plate in different positions of the pile body, the ordinary straight pile is changed into a variable cross-section end bearing pile, and the mechanical mechanism of the pile is also changed. It has the advantages of high bearing capacity and small settlement and deformation, so it has a good development prospect. At present, although many achievements have been made in the research of concrete expanded disk pile, it is still in the initial stage of development, and its research on vertical bearing capacity has accumulated a lot. However, the research on the mechanism of bearing horizontal load is very limited. Because the horizontal bearing capacity of pile foundation has been paid more attention to, the extensive application of this excellent pile type has been affected to a certain extent. The biggest difference between concrete pile and ordinary straight pile is the existence of bearing expansion plate, because of its flexibility in setting up bearing plate, such as the number of bearing plates, the distance between load-plates, the diameter and slope angle of bearing plates, etc. Therefore, the study of bearing plate parameters has practical significance. In order to guide engineering practice better, this paper will study the influence of slope angle on soil failure state under horizontal force by means of finite element simulation and small scale semi-plane pile test of undisturbed soil. In the aspect of software simulation, through ANSYS software, the analysis model of different bearing plate slope angle is established, and the stress and displacement analysis of the simulation result is carried out, and the results are compared, and the displacement of pile body with different bearing plate slope angle is preliminarily analyzed. At the same time, in order to observe the failure of soil around the pile, the failure state of the soil around the pile and the displacement of the top of the pile are recorded during the small model test of the failure state of the soil and the design value of the slope angle. After finishing and analyzing and comparing with the software simulation part, the failure pattern and reasonable bearing slope angle of the pile surrounding soil with different bearing plate slope angles are determined, and the horizontal bearing capacity of the pile is analyzed according to the failure state of the soil around the pile. Through the research in this paper, the characteristics of pile and soil failure under horizontal load can be determined qualitatively, and the influence of the angle of bearing plate slope on the pile bearing horizontal load can be determined qualitatively, and the theoretical foundation of concrete expanded plate pile can be improved. It is helpful to further study of this type of pile and its application in practical engineering in the future.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU473.1
本文编号：2269082
[Abstract]:As a new type of pile, concrete expanded disc pile is paid more and more attention by people. It is developed from the equal section concrete cast-in-place pile. By setting a bearing plate in different positions of the pile body, the ordinary straight pile is changed into a variable cross-section end bearing pile, and the mechanical mechanism of the pile is also changed. It has the advantages of high bearing capacity and small settlement and deformation, so it has a good development prospect. At present, although many achievements have been made in the research of concrete expanded disk pile, it is still in the initial stage of development, and its research on vertical bearing capacity has accumulated a lot. However, the research on the mechanism of bearing horizontal load is very limited. Because the horizontal bearing capacity of pile foundation has been paid more attention to, the extensive application of this excellent pile type has been affected to a certain extent. The biggest difference between concrete pile and ordinary straight pile is the existence of bearing expansion plate, because of its flexibility in setting up bearing plate, such as the number of bearing plates, the distance between load-plates, the diameter and slope angle of bearing plates, etc. Therefore, the study of bearing plate parameters has practical significance. In order to guide engineering practice better, this paper will study the influence of slope angle on soil failure state under horizontal force by means of finite element simulation and small scale semi-plane pile test of undisturbed soil. In the aspect of software simulation, through ANSYS software, the analysis model of different bearing plate slope angle is established, and the stress and displacement analysis of the simulation result is carried out, and the results are compared, and the displacement of pile body with different bearing plate slope angle is preliminarily analyzed. At the same time, in order to observe the failure of soil around the pile, the failure state of the soil around the pile and the displacement of the top of the pile are recorded during the small model test of the failure state of the soil and the design value of the slope angle. After finishing and analyzing and comparing with the software simulation part, the failure pattern and reasonable bearing slope angle of the pile surrounding soil with different bearing plate slope angles are determined, and the horizontal bearing capacity of the pile is analyzed according to the failure state of the soil around the pile. Through the research in this paper, the characteristics of pile and soil failure under horizontal load can be determined qualitatively, and the influence of the angle of bearing plate slope on the pile bearing horizontal load can be determined qualitatively, and the theoretical foundation of concrete expanded plate pile can be improved. It is helpful to further study of this type of pile and its application in practical engineering in the future.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU473.1
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