土石混合料剪切机理及抗剪强度分量特性研究
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摘要
为研究土石混合料剪切机理和抗剪强度分量特性,制备了7种级配类型土石料,涵盖了良好级配、均匀粒径、缺失中间粒径3种典型情况,代表了含石量在10%～75%的形态,在此条件下对剪切强度与级配–含石量关系、剪切机理及剪切强度分量的构建模型进行了研究。得到土石料中粗颗粒含量的多少是决定强度的关键因素;土石混合料的抗剪强度由咬合分量、摩擦分量和破碎分量共同构成,通过分析得出摩擦分量占总抗剪强度约10%,从颗粒细观运动的角度的剪切运移力学过程推导出咬合分量与摩擦分量的理论模型公式,该模型公式涵盖了含石量、初始接触水平角、内摩擦角、粒径等参数信息;由该模型计算得出咬合与摩擦分量占比与含石量呈指数正相关趋势,并给定该边界条件下的函数表达式。从理论上揭示了土石混合料剪切机理和抗剪强度的构成分量模型。
In order to study the shear mechanism and shear strength component characteristics of soil-rock mixtures, seven groups of graded soil-stone materials are prepared, covering three typical cases of good gradation, uniform particle size and missing intermediate particle size, representing the forms of stone content in the range of 10% to 75%. Under this condition, the construction models for shear strength and gradation-stone content, shear mechanism and shear strength component are studied.It is concluded that the content of coarse particles in soil-stone mixtures is the key factor to determine the strength. The shear strength of soil-rock mixtures is composed of the occlusal component, friction component and fracture component. Through analysis, the friction component accounts for about 10% of the total shear strength, and the theoretical model formula for the occlusion component and friction component is deduced from the shear transport mechanics process from the angle of the micro-motion of particles. The model formula covers the parameters such as stone content, initial contact horizontal angle,internal friction angle and particle size. From the calculation of the model, it is found that the proportion of occlusion and friction components is exponentially positively correlated with the stone content, and the functional expression under the boundary condition is given.
In order to study the shear mechanism and shear strength component characteristics of soil-rock mixtures, seven groups of graded soil-stone materials are prepared, covering three typical cases of good gradation, uniform particle size and missing intermediate particle size, representing the forms of stone content in the range of 10% to 75%. Under this condition, the construction models for shear strength and gradation-stone content, shear mechanism and shear strength component are studied.It is concluded that the content of coarse particles in soil-stone mixtures is the key factor to determine the strength. The shear strength of soil-rock mixtures is composed of the occlusal component, friction component and fracture component. Through analysis, the friction component accounts for about 10% of the total shear strength, and the theoretical model formula for the occlusion component and friction component is deduced from the shear transport mechanics process from the angle of the micro-motion of particles. The model formula covers the parameters such as stone content, initial contact horizontal angle,internal friction angle and particle size. From the calculation of the model, it is found that the proportion of occlusion and friction components is exponentially positively correlated with the stone content, and the functional expression under the boundary condition is given.
引文
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[2]丁秀丽,张宏明,黄书岭,等.基于细观数值试验的非饱和土石混合体力学特性研究[J].岩石力学与工程学报,2012,31(8):1553-1566.(DING Xiu-li,ZHANGHong-ming,HUANG Shu-ling,et al.Research on mechanical characteristics of unsaturated soil-rock mixture based on numerical experiments of mesostructure[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(8):1553-1566.(in Chinese))
[3]李维树,丁秀丽,邬爱清,等.蓄水对三峡库区土石混合体直剪强度参数的弱化程度研究[J].岩土力学,2007,28(7):1338-1342.(LI Wei-shu,DING Xiu-li,WU Ai-qing,et al.Shear strength degeneration of soil and rock mixture in Three Gorges Reservoir bank slopes under influence of impounding[J].Rock and Soil Mechanics,2007,28(7):1338-1342.(in Chinese))
[4]李维树,邬爱清,丁秀丽.三峡库区滑带土抗剪强度参数的影响因素研究[J].岩土力学,2006,27(1):56-60.(LIWei-shu,WU Ai-qing,DING Xiu-li.Study on influencing factors of shear strength parameters of slide zone clay in Three Gorges Reservoir Area[J].Rock and Soil Mechanics,2006,27(1):56-60.(in Chinese))
[5]舒志乐,刘新荣,刘保县.基于分形理论的土石混合体强度特征研究[J].岩石力学与工程学报,2009,28(增刊1):2652-2656.(SHU Zhi-le,LIU Xin-rong,LIU Bao-xian.Study of strength properties of earth-rock aggregate based on fractals[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S1):2652-2656.(in Chinese))
[6]DAI Beibing.Micromechanical invest-ingation of the behavior of granular materials[D].Hong Kong:University of Hong Kong,2010.
[7]刘斯宏,黄明坤,王子健,等.破碎性堆石料单剪试验研究[J].岩土工程学报,2015,37(8):1503-1508.(LIU Si-hong,HUANG Ming-kung,WANG Zi-jian,et al.Simple shear tests on breakable rockfill materials[J].Chinese Journal of Geotechnical Engineering,2015,37(8):1503-1508.(in Chinese))
[8]郭熙灵,胡辉,包承纲.堆石料颗粒破碎对剪胀性及抗剪强度的影响[J].岩土工程学报,1997,29(3):86-91.(GUO Xi-ling,HU Hui,BAO Cheng-gang.Experimental studies of the effects of grain breakage on the dilatancy and shear strength of rock fill[J].Chinese Journal of Geotechnical Engineering,1997,29(3):86-91.(in Chinese))
[9]刘新荣,涂义亮,王林枫,等.土石混合体的剪切面分形特征及强度产生机制[J].岩石力学与工程学报,2017,36(9):2260-2274.(LIU Xin-rong,TU Yi-liang,WANG Lin-feng,et al.Fractal characteristics of shear failure surface and mechanism of strength generation of soil-rock aggregate[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(9):2260-2274.(in Chinese))
[10]DAI Bei-bing.Micromechanical invest-ingation of the behavior of granular materials[D].Hong Kong:University of Hong Kong,2010.