【摘要】：近年來,水利行業(yè)、交通運輸業(yè)以及建筑行業(yè)等得到了前所未有的快速發(fā)展,大型巖土工程建設項目不斷進行。粗粒土料因其壓實性好、填筑密度大、沉陷變形小、透水性強、承載力高等諸多工程建筑優(yōu)點,廣泛應用于土石壩、高速公路和鐵路,開展粗粒土的物理力學特性研究具有重要的應用價值和學術意義。本文從三軸抗剪強度特性、滲透特性、壓縮變形特性三方面出發(fā),開展了大量的室內(nèi)試驗。采用筆者直接參與負責的試驗資料數(shù)據(jù)及一些他人試驗的資料數(shù)據(jù)進行整理、分析,對粗粒土的物理力學特性及其變化規(guī)律、參數(shù)計算方法進行了研究。具體開展了以下幾個方面的研究：1、通過對三軸試驗結果數(shù)據(jù)的整理研究,分析了不同密度和不同圍壓下,應力應變曲線變化規(guī)律,鄧肯一張模型存在的問題,提出了一個新的具有十一個參數(shù)的改進模型。通過計算證明,改進模型能夠更好地反映粗粒土的體變特性,提高了鄧肯一張模型的計算精度。2、通過對滲透試驗結果數(shù)據(jù)的整理研究,分析了滲透方向、粒徑特征、有效粒徑、孔隙比對粗粒土滲透系數(shù)的影響,探討了各因素對粗粒土滲透系數(shù)產(chǎn)生影響的機理；基于太沙基模型和哈增模型建立了兩個改進滲透系數(shù)模型公式,計算和分析試驗結果證明,本文所建立的滲透系數(shù)計算模型更加完善,計算精度高。3、通過對壓縮試驗數(shù)據(jù)結果的整理研究,分析了含水量、壓實度對孔隙比、壓縮系數(shù)的影響,規(guī)范中固結系數(shù)計算方法存在的問題,并進行了改進,提出了一種的方法——適線法。
[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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU43

【參考文獻】

相關期刊論文 前6條

1 武明;土石混合非均質(zhì)填料力學特性試驗研究[J];公路;1997年01期

2 張啟岳;;用大型三軸儀測定砂礫料和堆石料的抗剪強度[J];水利水運科學研究;1980年01期

3 沈珠江;;考慮剪脹性的土和石料的非線性應力應變模式[J];水利水運科學研究;1986年04期

4 郭熙靈,胡輝,包承綱;堆石料顆粒破碎對剪脹性及抗剪強度的影響[J];巖土工程學報;1997年03期

5 郭見楊;黃勝生;喻小生;;論粗粒料的E-μ模型[J];巖土力學;1983年01期

6 張兵;高玉峰;劉偉;艾艷梅;;壩體填筑料壓縮特性及影響因素分析[J];巖土力學;2009年03期

相關碩士學位論文 前1條

1 張云根;高速鐵路基床填料物理力學特性試驗分析[D];西南交通大學;2008年

，

本文編號：2191565