岩土材料细观、宏观强度参数的关系研究
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摘要
岩土材料细观与宏观概念的界定有个相对尺度的区别.当前对于岩土体宏观与细观参数间规律的探索主要集中在本构关系和计算分析两个方面.论文利用颗粒流,设计了无摩擦作用下3个颗粒间黏结强度增加、弱黏结和强黏结作用下19个内摩擦角在0-90度单调增加等共计41组单轴压缩数值试验.分析发现:(1)颗粒间黏结强度的增加,使得粒间较难破裂,微裂纹数量急剧减少.(2)黏结强度一定时,45度前后破坏模式截然不同,与剪切破坏角有关.(3)强黏结峰后曲线跌落明显,脆性破坏特征明显.(4)颗粒间强度参数的变化,不改变能量转移模式,黏结强度的改变使得应变能占输入能量的比例提高,即材料破坏的塑性渐变减小.弱黏结时,随着内摩擦角的增加应变能占输入能量比例逐步减小.强黏结时,应变能占输入能量比例近似,减小不明显.
There exists a relative scale in definition of microscopic and macroscopic on geo-material.Currently researches on law between microscopic and macroscopic parameters of geo-material focus on fields of constitutive equation and numerical method.In this paper,41 groups of uniaxial compression tests with three kinds of cohesion between mineral particles,nineteenth types of friction angle between mineral particles changing from 0 to 90 are designed by particle flow code.After experimental results are analyzed,found that enhancement of meso-cohesion makes particles difficult to rupture and micro-cracks decreases sharply,that failure mode changes around 45 degree under weak or strong meso-cohesion conditions,which relates to shear failure angle,that post-curve drops significantly with apparent brittleness,and that change of particle meso-strength doesn't alter energy transferring during loading process,cohesion increase enhances proportion of strain energy and decreases plasticity of material,proportion of strain one decreases with increase of friction angle under weak cohesion condition and become constant under strong cohesion condition.
There exists a relative scale in definition of microscopic and macroscopic on geo-material.Currently researches on law between microscopic and macroscopic parameters of geo-material focus on fields of constitutive equation and numerical method.In this paper,41 groups of uniaxial compression tests with three kinds of cohesion between mineral particles,nineteenth types of friction angle between mineral particles changing from 0 to 90 are designed by particle flow code.After experimental results are analyzed,found that enhancement of meso-cohesion makes particles difficult to rupture and micro-cracks decreases sharply,that failure mode changes around 45 degree under weak or strong meso-cohesion conditions,which relates to shear failure angle,that post-curve drops significantly with apparent brittleness,and that change of particle meso-strength doesn't alter energy transferring during loading process,cohesion increase enhances proportion of strain energy and decreases plasticity of material,proportion of strain one decreases with increase of friction angle under weak cohesion condition and become constant under strong cohesion condition.
引文
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[14]中华人民共和国国家标准编写组.工程岩体分级标准[S].北京:中国建筑出版社,1995..(The NationalStandards Compilation Group of People’s Republic ofChina.GB50218-94.Standard for Engineering Classi-fication of Rock Massas[S].Beijing:China PlanningPress,1995.(in Chinese))
[2]谢定义.21世纪土力学的思考[J].岩土工程学报,1997,19(4):111-114.(Xie D Y.Think of soil me-chanics in 21century[J].Chinese Journal of Geotech-nical Engineering,1997,19(4):111-114.(in Chi-nese))
[3]沈珠江.关于土力学发展前景的设想[J].岩土工程学报,1994,16(1):110-111.(Shen Z J.Imagination ofsoil mechanics development prospects[J].ChineseJournal of Geotechnical Engineering,1994,16(1):110-111.(in Chinese))
[4]谢定义.黄土力学特性与应用研究的过去、现在与未来[J].地下空间,1999,19(4):273-284.(Xie D Y.The Past,present and future of the researeh on mee-hanieal charaeteristies and application of loess[J].Un-derground Space,1999,19(4):273-284.(in Chinese))
[5]刘恩龙.岩土破损力学:结构块破损机制与二元介质模型[J].岩土力学,2011,32(S.1):13-22.(Liu E L.Breakage mechanics for geomaterials:Breakage mech-anism of structural blocks and binary-medium model[J].Rock and Soil Mechanics,2011,32(S.1):13-22.(in Chinese))
[6]沈珠江,陈铁林.岩土破损力学:结构类型与荷载分担[J].岩土力学与工程学报,2004,25(13):2137-2142.(Shen Z J,Chen T L.Breakage mechanics of geolog-ical materials-structural type and load sharing[J].Chinese Journal of Rock Mechanics and Engineering,2005,25(13):2137-2142.(in Chinese))
[7]岳中琦.岩土细观介质空间分布数字表述和相关力学数值分析的方法、应用和进展[J].岩土力学与工程学报,2006,25(5):875-888.(Yue Z Q.Digital represen-tation of meso-geomaterial spatial distribution and as-sociated numerical analysis of eomechanics:methods,applications and developments[J].Chinese Journal ofRock Mechanics and Engineering,2006,25(5):875-888.(in Chinese))
[8]徐小敏,凌道盛,陈云敏,黄博.基于线性接触模型的颗粒材料细-宏观弹性常数相关关系研究[J].岩土工程学报,2011,32(7):991-998.(Xu X M,Ling D S,Chen Y M,Huang B.Correlation of microscopic andmacroscopic elastic constants of granular materialsbased on linear contact model[J].Chinese Journal ofGeotechnical Engineering,2011,32(7):991-998.(inChinese))
[9]陈建峰,李辉利,周健.黏性土宏细观参数相关性研究[J].力学季刊,2011,32(2):304-309.(Chen J F,Li HL,Zhou J.Study on the relevance of macro-micro pa-rameters for clays[J].Chinese Quarterly of Mechan-ics,2011,32(2):304-309.(in Chinese))
[10]张洪武.微观接触颗粒岩土非线性力学分析模型[J].岩土工程学报,2002,24(1):12-15.(Zhang H W.Anon-linear mechanical model for analysis of granularcontact geomaterials[J].Chinese Journal of Geotech-nical Engineering,2002,24(1):12-15.(in Chinese))
[11]李彰明.土体力学响应的有限特征比理论研究[D].武汉:华中科技大学,2004.(Li Z M.Study on Finite Char-acteristic Ratio Theory for Analyzing Mechanical Respon-ses of Soils[D].Wuhan:Huazhong University of Scienceand Technology,2004.(in Chinese))
[12]李国莹.细观非均质岩石材料的力学及变形性质数值研究[D].济南:山东大学,2011.(Li G Y.NumericalStudies on the Meehanical and Deformational Characteris-tics of Micro-Heterogeneous Rock Material[D].Jinan:Shandong University,2011.(in Chinese))
[13]孙丹.周期性细观结构材料本构方程中的尺度效应[D].哈尔滨:中国地震局工程力学研究所,2006.(Sun D.The Scale Affect in Constitutive Equation ofPeriodic Mesoscale Material[D].Harbin:Institute ofEngineering Mechanics,China Earthquake Adminis-tration,2006.(in Chinese))
[14]中华人民共和国国家标准编写组.工程岩体分级标准[S].北京:中国建筑出版社,1995..(The NationalStandards Compilation Group of People’s Republic ofChina.GB50218-94.Standard for Engineering Classi-fication of Rock Massas[S].Beijing:China PlanningPress,1995.(in Chinese))
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