《大直径钻孔灌注桩高应变动力检测技术研究及推广应用》毕业论文.doc
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《大直径钻孔灌注桩高应变动力检测技术研究及推广应用》毕业论文,大直径钻孔灌注桩高应变动力检测技术研究及推广应用the research on application of using power test techniques of high strain to test large diameter borehole dabbling pile. 摘 要本文紧紧围绕高应变法在检...
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大直径钻孔灌注桩高应变动力检测技术研究及推广应用
The Research on Application of using power test techniques of high strain to test large diameter borehole dabbling pile.
摘 要
本文紧紧围绕高应变法在检测大直径钻孔灌注桩承载力中的关键技术这一主旨，从钻孔灌注桩的特点，动力测桩的基本原理，高应变动力测桩的物理基础、现场测试技术、资料的分析处理、实测效果等方面进行了分析与研究。
文中作者通过实践找出了大直径钻孔灌注桩高应变动力检测技术的特殊性，并对其中的关键技术进行了研究。并把这些关键技术研究结果应用于某桥梁基桩的检测过程中，取得了令建设方满意的结果。通过工程实践，充分证明了一点，即大直径钻孔灌注桩高应变动力检测技术虽然比较复杂与困难，但通过对关键技术进行深入的分析与研究，并采取合理的处理手段，是可以用于检测工程桩单桩承载力的。为此，高应变检测大直径灌注桩可以部分的代替费时、费钱的静载荷试验。同时，从统计学角度分析，高应变作为静载荷试验的补充，对整个桩基础更有代表性。
文中作者把高应变检测结果进行分析计算，这个过程分为三个部分。第一部分通过大量的高应变良好拟合结果，尤其是和静载荷试验对比过的拟合结果，得到某个地质条件下的桩土作用参数，对这些参数进行收集和整理，可以用于指导以后类似工程的拟合分析。第二部分根据高应变的检测结果，统计计算出不同地层单元的桩周土极限摩阻力和桩尖土极限承载力，可以作为本地经验值，应用于同种施工工艺的桩型的设计工作中。第三部分是统计与分析某地区大直径钻孔灌注长桩（桩径≥1200mm，桩长/桩径>30）在设计荷载作用下的承载性状，得出桩侧阻力占到桩总阻力的80%以上，桩侧阻力起主要承载作用。
关键词：高应变，大直径钻孔灌注桩，实测曲线拟合法
Abstract
On the characteristics of borehole dabbling pile, fundamentals of power test the pile, and physical basis, on-the-spot test, material processing and actual effectiveness of high strain power test the pile, this paper made an analysis and research, encircling the gist that the core techniques of using high strain to test the bearing strength of large diameter borehole dabbling pile.
In this paper, the author found the particularity of using high strain to power test the large diameter borehole dabbling pile on the base of practice, and made a research of its core techniques. The results obtained had been applied to the testing course of piles of bridges in the expressway of with satisfactory results. The engineering practice proved that it is complex and difficult to use the power test techniques of high strain to test large diameter borehole dabbling pile. However, it can be used to test the bearing strength of one engineering pile by analyzing its core techniques and taking rational methods. Therefore, we can use high strain to test the bearing strength of large diameter borehole dabbling pile to partly instead of dead load experiment with saving both time and money. At the same time, high strain is represential for the pile as the supplement of dead load experiment.
The author analyzed the results of high strain test by three steps. First, the author collected and collated the acting parameters of pile-soil in certain geological condition to guide the fitting analysis to come. These parameters come from a large number of good results of high strain, especially results compared with dead load experiment. In the second part, the limit frictional resistance of the earth around pile and the limit bearing strength of the earth of tip pile in different stratum units were counted and calculated, using in the designing of piles in the similar execution as local empirical data. In the third part, the author counted and analyzed the bearing strength behavior of large diameter borehole dabbling long pile (d≥1200mm, l/d>30) under designed-load conditions, and got results that resistance of pile side occupied over 80%of the whole with main effect of bearing strength.
Key words: high strain，large diameter borehole dabbling pile，
actual curve fitting
目 录
1 绪论 1
1.1钻孔灌注桩的概述 1
1.1.1 钻孔灌注桩的发展 1
1.1.2 钻孔灌注桩的特点 1
1.2 高应变动力检测概述 3
1.2.1 高应变动力检测技术的发展 3
1.2.2 高应变动力检测分析方法简介 4
1.3研究大直径钻孔灌注桩高应变动力检测技术的意义 4
1.4 本文的研究思路和技术路线 5
2 桩的动力检测技术的基本理论 7
2.1 一维波动方程 7
2.2应力波在不同阻抗界面上的反射和透射 8
3 高应变法测试与分析 11
3.1载力计算方法—实测曲线拟合法 11
3.1.1 桩土体系的基本假定 11
3.1.2应力波的基本描述及其作用规律 11
3.1.3 弹性波速 14
3.1.4桩身阻抗变化对应力波传播的影响 15
3.1.5土阻力所产生的应力波及其传播规律 17
3.1.6桩身阻抗变化和土阻力在F—V图上的表现 18
3.2承载力计算方法—凯司法 20
3.2.1凯司法的近似假..
The Research on Application of using power test techniques of high strain to test large diameter borehole dabbling pile.
摘 要
本文紧紧围绕高应变法在检测大直径钻孔灌注桩承载力中的关键技术这一主旨，从钻孔灌注桩的特点，动力测桩的基本原理，高应变动力测桩的物理基础、现场测试技术、资料的分析处理、实测效果等方面进行了分析与研究。
文中作者通过实践找出了大直径钻孔灌注桩高应变动力检测技术的特殊性，并对其中的关键技术进行了研究。并把这些关键技术研究结果应用于某桥梁基桩的检测过程中，取得了令建设方满意的结果。通过工程实践，充分证明了一点，即大直径钻孔灌注桩高应变动力检测技术虽然比较复杂与困难，但通过对关键技术进行深入的分析与研究，并采取合理的处理手段，是可以用于检测工程桩单桩承载力的。为此，高应变检测大直径灌注桩可以部分的代替费时、费钱的静载荷试验。同时，从统计学角度分析，高应变作为静载荷试验的补充，对整个桩基础更有代表性。
文中作者把高应变检测结果进行分析计算，这个过程分为三个部分。第一部分通过大量的高应变良好拟合结果，尤其是和静载荷试验对比过的拟合结果，得到某个地质条件下的桩土作用参数，对这些参数进行收集和整理，可以用于指导以后类似工程的拟合分析。第二部分根据高应变的检测结果，统计计算出不同地层单元的桩周土极限摩阻力和桩尖土极限承载力，可以作为本地经验值，应用于同种施工工艺的桩型的设计工作中。第三部分是统计与分析某地区大直径钻孔灌注长桩（桩径≥1200mm，桩长/桩径>30）在设计荷载作用下的承载性状，得出桩侧阻力占到桩总阻力的80%以上，桩侧阻力起主要承载作用。
关键词：高应变，大直径钻孔灌注桩，实测曲线拟合法
Abstract
On the characteristics of borehole dabbling pile, fundamentals of power test the pile, and physical basis, on-the-spot test, material processing and actual effectiveness of high strain power test the pile, this paper made an analysis and research, encircling the gist that the core techniques of using high strain to test the bearing strength of large diameter borehole dabbling pile.
In this paper, the author found the particularity of using high strain to power test the large diameter borehole dabbling pile on the base of practice, and made a research of its core techniques. The results obtained had been applied to the testing course of piles of bridges in the expressway of with satisfactory results. The engineering practice proved that it is complex and difficult to use the power test techniques of high strain to test large diameter borehole dabbling pile. However, it can be used to test the bearing strength of one engineering pile by analyzing its core techniques and taking rational methods. Therefore, we can use high strain to test the bearing strength of large diameter borehole dabbling pile to partly instead of dead load experiment with saving both time and money. At the same time, high strain is represential for the pile as the supplement of dead load experiment.
The author analyzed the results of high strain test by three steps. First, the author collected and collated the acting parameters of pile-soil in certain geological condition to guide the fitting analysis to come. These parameters come from a large number of good results of high strain, especially results compared with dead load experiment. In the second part, the limit frictional resistance of the earth around pile and the limit bearing strength of the earth of tip pile in different stratum units were counted and calculated, using in the designing of piles in the similar execution as local empirical data. In the third part, the author counted and analyzed the bearing strength behavior of large diameter borehole dabbling long pile (d≥1200mm, l/d>30) under designed-load conditions, and got results that resistance of pile side occupied over 80%of the whole with main effect of bearing strength.
Key words: high strain，large diameter borehole dabbling pile，
actual curve fitting
目 录
1 绪论 1
1.1钻孔灌注桩的概述 1
1.1.1 钻孔灌注桩的发展 1
1.1.2 钻孔灌注桩的特点 1
1.2 高应变动力检测概述 3
1.2.1 高应变动力检测技术的发展 3
1.2.2 高应变动力检测分析方法简介 4
1.3研究大直径钻孔灌注桩高应变动力检测技术的意义 4
1.4 本文的研究思路和技术路线 5
2 桩的动力检测技术的基本理论 7
2.1 一维波动方程 7
2.2应力波在不同阻抗界面上的反射和透射 8
3 高应变法测试与分析 11
3.1载力计算方法—实测曲线拟合法 11
3.1.1 桩土体系的基本假定 11
3.1.2应力波的基本描述及其作用规律 11
3.1.3 弹性波速 14
3.1.4桩身阻抗变化对应力波传播的影响 15
3.1.5土阻力所产生的应力波及其传播规律 17
3.1.6桩身阻抗变化和土阻力在F—V图上的表现 18
3.2承载力计算方法—凯司法 20
3.2.1凯司法的近似假..
