本文選題：跨尺度 + “基體—增強顆�！蹦Ｐ���； 參考：《華南理工大學》2015年碩士論文

【摘要】：關于巖土類介質(zhì)的研究在近幾個世紀取得了長足進步,土力學得到了廣泛發(fā)展。但由于土體介質(zhì)本身性質(zhì)的不均勻性,土力學理論的發(fā)展始終具有很大局限性。傳統(tǒng)上,土體往往被當做是均勻體,這與實際土體結(jié)構(gòu)相悖。在土體的形成過程、環(huán)境、年代等因素都不一樣的情況下,土的工程特性復雜多樣,同樣,其顆粒成分也非常不均勻。在宏觀角度上,土體都是顆粒物組合而成,可視為均勻體,但在細觀和微觀角度上,組成土體的顆粒大小不一、礦物成分不同、形狀各異、分布形式也不同。本文主要針對土體的尺度不均勻特性,展開了以下工作:1.探討了跨尺度土體的試驗方法,制成了“基體-增強顆粒”模型。針對以往跨尺度土體試驗,發(fā)現(xiàn)在增強顆粒的粒徑、體分比外,增強顆粒本身的分布亦對土體的性質(zhì)存在很大影響。2.使用“基體-增強顆�！蹦Ｐ�,進行了三軸不固結(jié)不排水試驗、無側(cè)限壓縮試驗和直剪試驗。發(fā)現(xiàn)隨著增強顆粒提高,模型強度下降;隨著體分比提高,模型強度分為提高、穩(wěn)定、下降三個階段。3.制成了具有準確分布曲線的增強顆粒,并使用實際的顆粒分布曲線求得了顆粒的統(tǒng)計平均粒徑,發(fā)現(xiàn)按照實際的顆粒分布曲線計算所得統(tǒng)計平均粒徑與假想均勻分布差異較大。4.介紹了跨尺度土體的胞元體理論,引進了相關公式,并建立了尺度應力和傳統(tǒng)應力之間的關系式。5.推導出了三軸不排水條件下的尺度摩爾-庫倫理論及尺度D-P理論,并以理論解擬合了實際試驗結(jié)果。在應力空間中,給出了尺度摩爾-庫倫屈服面的簡圖。
[Abstract]:Great progress has been made in the research of geotechnical media in recent centuries, and soil mechanics has been extensively developed. However, the development of soil mechanics theory is always limited because of the inhomogeneity of soil medium itself. Traditionally, the soil is often regarded as a homogeneous body, which is contrary to the actual soil structure. When the formation process, environment, age and other factors of soil are different, the engineering characteristics of soil are complex and diverse, and its particle composition is also very uneven. From the macro point of view, the soil mass is composed of particles, which can be regarded as homogeneous body. However, the particle size, mineral composition, shape and distribution form of the soil mass are different from the micro and micro point of view. In this paper, aiming at the scale inhomogeneity of soil, the following work is carried out: 1. The test method of cross-scale soil is discussed, and a matrix-reinforced particle model is developed. According to the past cross-scale soil tests, it is found that the distribution of the reinforced particles also has a great influence on the properties of the soil in addition to the particle size and volume fraction. Triaxial unconsolidated undrained tests, unconfined compression tests and direct shear tests were carried out using the matrix reinforced particle model. It is found that the strength of the model decreases with the increase of the particle strength, and with the increase of the volume fraction, the strength of the model is divided into three stages, I. e., increasing, stabilizing, and decreasing. The enhancement particles with accurate distribution curve were made, and the statistical average particle size was obtained by using the actual particle distribution curve. It was found that the statistical average particle size calculated according to the actual particle distribution curve was quite different from the imaginary uniform distribution. The cellular theory of cross-scale soil is introduced, the relevant formulas are introduced, and the relationship between scale stress and traditional stress is established. The scale Mole-Coulomb theory and the scale D-P theory under triaxial undrained conditions are derived, and the experimental results are fitted with the theoretical solutions. In the stress space, a simple diagram of the scale Moore-Coulomb yield surface is given.
【學位授予單位】：華南理工大學
【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10條

1 楊洋;唐壽高;;顆粒流的離散元法模擬及其進展[J];中國粉體技術(shù);2006年05期

2 楊圣奇,蘇承東,徐衛(wèi)亞;巖石材料尺寸效應的試驗和理論研究[J];工程力學;2005年04期

3 江五貴;黎軍頑;蘇建君;湯井倫;;納米壓痕試驗中壓頭尺寸效應的準連續(xù)介質(zhì)法分析[J];固體力學學報;2007年04期

4 戴蘭宏,凌中,白以龍;顆粒增強金屬基復合材料變形強化中的應變梯度效應[J];高壓物理學報;2001年01期

5 丁向東,劉剛,王瑞紅,孫軍,江中浩,連建設;顆粒增強金屬基復合材料的屈服行為[J];金屬學報;2002年04期

6 周亮;姚英學;;基于納米壓痕技術(shù)和AFM的單晶鋁硬度測試實驗研究[J];機械科學與技術(shù);2006年01期

7 呂兆興;馮增朝;趙陽升;;巖石的非均質(zhì)性對其材料強度尺寸效應的影響[J];煤炭學報;2007年09期

8 蘇建君;江五貴;黎軍頑;趙晟;;納米壓痕試驗中圓柱形壓頭尺寸效應[J];南昌航空大學學報(自然科學版);2007年04期

9 房營光;;土體力學特性尺度效應的三軸抗剪試驗分析[J];水利學報;2014年06期

10 潘一山,魏建明;巖石材料應變軟化尺寸效應的實驗和理論研究[J];巖石力學與工程學報;2002年02期

相關博士學位論文 前2條

1 馬文旭;土體介質(zhì)尺度效應的試驗及數(shù)值模擬分析[D];華南理工大學;2011年

2 王一兆;土體顆粒尺度效應的理論與試驗研究[D];華南理工大學;2014年

相關碩士學位論文 前2條

1 李哲;粘土強度“基體—加強顆�！蹦Ｐ驮囼灧治鯷D];華南理工大學;2010年

2 何智威;土體介質(zhì)跨尺度強度與變形試驗研究[D];華南理工大學;2012年

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