粗粒土物理力学特性研究
发布时间：2018-08-19 11:47
【摘要】：近年来,水利行业、交通运输业以及建筑行业等得到了前所未有的快速发展,大型岩土工程建设项目不断进行。粗粒土料因其压实性好、填筑密度大、沉陷变形小、透水性强、承载力高等诸多工程建筑优点,广泛应用于土石坝、高速公路和铁路,开展粗粒土的物理力学特性研究具有重要的应用价值和学术意义。本文从三轴抗剪强度特性、渗透特性、压缩变形特性三方面出发,开展了大量的室内试验。采用笔者直接参与负责的试验资料数据及一些他人试验的资料数据进行整理、分析,对粗粒土的物理力学特性及其变化规律、参数计算方法进行了研究。具体开展了以下几个方面的研究：1、通过对三轴试验结果数据的整理研究,分析了不同密度和不同围压下,应力应变曲线变化规律,邓肯一张模型存在的问题,提出了一个新的具有十一个参数的改进模型。通过计算证明,改进模型能够更好地反映粗粒土的体变特性,提高了邓肯一张模型的计算精度。2、通过对渗透试验结果数据的整理研究,分析了渗透方向、粒径特征、有效粒径、孔隙比对粗粒土渗透系数的影响,探讨了各因素对粗粒土渗透系数产生影响的机理；基于太沙基模型和哈增模型建立了两个改进渗透系数模型公式,计算和分析试验结果证明,本文所建立的渗透系数计算模型更加完善,计算精度高。3、通过对压缩试验数据结果的整理研究,分析了含水量、压实度对孔隙比、压缩系数的影响,规范中固结系数计算方法存在的问题,并进行了改进,提出了一种的方法——适线法。
[Abstract]:In recent years, water conservancy industry, transportation industry and construction industry have developed rapidly, and large geotechnical construction projects have been carried out continuously. Coarse-grained soil is widely used in earth-rock dams, highways and railways because of its good compaction, high density of filling, small settlement deformation, strong permeability, high bearing capacity and so on. It is of great value and academic significance to study the physical and mechanical properties of coarse grained soil. In this paper, a large number of laboratory tests have been carried out from three aspects: triaxial shear strength, permeability and compression deformation. The physical and mechanical properties of coarse-grained soil and its variation law and the method of parameter calculation are studied by means of the data of the test data which the author is directly responsible for and the data of some other people's experiments. In this paper, we have carried out the following research: 1. Through the analysis of the data of the triaxial test results, we have analyzed the variation law of the stress-strain curve under different density and different confining pressure, and the problems existing in the Duncan model. A new improved model with eleven parameters is proposed. It is proved by calculation that the improved model can better reflect the bulk deformation characteristics of coarse grained soil, and improve the calculation accuracy of Duncan's model. The permeability direction, particle size characteristics and effective particle size are analyzed by collating the data of permeation test results. The influence of porosity ratio on permeability coefficient of coarse grained soil is discussed, and the influence mechanism of various factors on permeability coefficient of coarse grained soil is discussed, two improved permeability coefficient model formulas are established based on Terzaghi model and Hazen model, and the results of calculation and analysis show that, The calculation model of permeability coefficient established in this paper is more perfect, and the accuracy of calculation is high. By studying the results of compression test, the effects of water content and compaction on porosity and compression coefficient are analyzed. The problems in the calculation method of consolidation coefficient in the specification are improved, and a new method, the fitting line method, is put forward.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43
本文编号：2191565
[Abstract]:In recent years, water conservancy industry, transportation industry and construction industry have developed rapidly, and large geotechnical construction projects have been carried out continuously. Coarse-grained soil is widely used in earth-rock dams, highways and railways because of its good compaction, high density of filling, small settlement deformation, strong permeability, high bearing capacity and so on. It is of great value and academic significance to study the physical and mechanical properties of coarse grained soil. In this paper, a large number of laboratory tests have been carried out from three aspects: triaxial shear strength, permeability and compression deformation. The physical and mechanical properties of coarse-grained soil and its variation law and the method of parameter calculation are studied by means of the data of the test data which the author is directly responsible for and the data of some other people's experiments. In this paper, we have carried out the following research: 1. Through the analysis of the data of the triaxial test results, we have analyzed the variation law of the stress-strain curve under different density and different confining pressure, and the problems existing in the Duncan model. A new improved model with eleven parameters is proposed. It is proved by calculation that the improved model can better reflect the bulk deformation characteristics of coarse grained soil, and improve the calculation accuracy of Duncan's model. The permeability direction, particle size characteristics and effective particle size are analyzed by collating the data of permeation test results. The influence of porosity ratio on permeability coefficient of coarse grained soil is discussed, and the influence mechanism of various factors on permeability coefficient of coarse grained soil is discussed, two improved permeability coefficient model formulas are established based on Terzaghi model and Hazen model, and the results of calculation and analysis show that, The calculation model of permeability coefficient established in this paper is more perfect, and the accuracy of calculation is high. By studying the results of compression test, the effects of water content and compaction on porosity and compression coefficient are analyzed. The problems in the calculation method of consolidation coefficient in the specification are improved, and a new method, the fitting line method, is put forward.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43
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