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级配碎石路面基层材料力学性能研究

发布时间:2018-02-02 14:56

  本文关键词: 级配碎石 CBR 三轴试验 摩尔-库伦准则 永久变形 出处:《苏州科技大学》2017年硕士论文 论文类型:学位论文


【摘要】:路面结构层中常用的半刚性基层在使用过程中出现了受温度、湿度影响大,超载后破坏较快,易产生反射裂缝等缺点。我国研究人员已经开始着重研究排水效果更好、能有效控制反射裂缝的级配碎石柔性基层。本文通过对7种级配碎石进行CBR试验、三轴剪切试验和永久变形试验研究了作为基层材料级配碎石的应力分布,CBR强度以及其影响因素,三轴抗剪强度和变形特性,为级配碎石基层的推广提供技术支持。本文选用石灰岩作为试验材料,在验证其基础性能的满足材料使用要求的前提下,设计了7种级配碎石,并通过击实试验确定了材料的最佳含水率和最大干密度。然后,通过ABAQUS有限元软件计算半刚性基层和柔性基层两种类型的路面结构层,分析其的受力特点上的差异。结合当前国内外研究成果和力学经验设计方法,设计了34种常用的粒料基层路面结构,对34种路面结构进行三维有限元模拟计算,确定了柔性基层、底基层内的第三主应力分布规律和分布范围。根据计算结果确定实验室永久变形试验的应力水平。其次,进行CBR试验,通过CBR值,筛选出符合规范要求的4种级配,分别用于各等级公路的基层和底基层。研究CBR与级配碎石级配的关系,结果表明:CBR与级配曲线、细度模数以及平均粒径有一定的关系。为满足CBR要求,级配碎石可参考以上参数进行设计。对7种级配碎石在最佳含水率下进行进行三轴剪切试验,研究三轴试验参数与CBR之间的关系。对筛选出的4种级配碎石在不同含水率和压实度下进项三轴试验,以摩尔-库伦强度准则为基础确定级配碎石的破坏准则,分析了摩尔-库伦参数的与含水率和压实度的关系。在以上模拟计算和试验的基础上进行级配碎石永久变形试验。通过试验发现级配碎石的弹性变形为级配碎石本身的特性,含水率对级配碎石弹性变形有一定影响。级配碎石的含水率、围压和偏应力对级配碎石的塑性变形影响显著。在实际级配碎石柔性基层中,对基层内的含水率和超载情况的严格控制可以有效地防止级配碎石发生破坏。
[Abstract]:The semi-rigid base course which is commonly used in pavement structure layer has been affected by temperature and humidity and destroyed quickly after overload. It is easy to produce reflective cracks and other shortcomings. Our researchers have begun to focus on the better drainage effect, can effectively control the reflective cracks of graded gravel flexible base. This paper carried out CBR test on seven graded crushed stones. Triaxial shear test and permanent deformation test were used to study the stress distribution and CBR strength of graded macadam as base material, its influencing factors, triaxial shear strength and deformation characteristics. In order to provide technical support for the promotion of graded crushed stone base, this paper selected limestone as the test material, under the premise of verifying its basic performance to meet the requirements of material use, seven graded crushed stones were designed. The optimum moisture content and maximum dry density of the material were determined by compaction test. Then, the semi-rigid base and flexible base pavement structure layer were calculated by ABAQUS finite element software. This paper analyzes the differences of the mechanical characteristics and designs 34 kinds of common granular base pavement structures based on the current domestic and foreign research results and mechanical experience design method. The three dimensional finite element simulation of 34 kinds of pavement structures is carried out, and the flexible base is determined. According to the calculation results, the stress level of the laboratory permanent deformation test is determined. Secondly, the CBR test is carried out, and the CBR value is adopted. Four grades which meet the requirements of the specification were selected and used in the base and base of each grade highway respectively. The relationship between CBR and gradation of crushed stone was studied. The results show that the ratio of CBR and gradation curve. In order to meet the requirement of CBR, gradation macadam can be designed with reference to the above parameters. Triaxial shear tests of seven graded crushed stones are carried out under the optimum moisture content. The relationship between triaxial test parameters and CBR was studied. Four graded crushed stones were selected under different moisture content and compaction. The failure criterion of graded crushed stone is determined on the basis of Mohr-Coulomb strength criterion. The relationship between Mole-Coulomb parameter and moisture content and compaction degree is analyzed. Based on the above simulation calculation and test, the permanent deformation test of graded crushed stone is carried out. It is found that the elastic deformation of graded crushed stone is graded crushed stone. Of its own nature. Moisture content has a certain effect on the elastic deformation of graded crushed stone. The moisture content, confining pressure and deflection stress of graded crushed stone have a significant effect on plastic deformation of graded crushed stone. The strict control of moisture content and overload in the base can effectively prevent the failure of graded crushed stone.
【学位授予单位】:苏州科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:U416.214

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