应变速率对含砾滑带土抗剪强度影响研究
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摘要
在三轴实验中所得滑坡滑带土强度结果既受实验方法影响,也与不同的实验条件和应变速率密切相关。以某滑坡为例,结合室内试验,基于蒙特卡洛原理建立含砾滑带土数值试验模型,揭示不同应变速率下滑带土强度特性的响应规律,并建立反映不同应变速率下滑带土强度预测模型。结果表明,不同应变速率下抗剪强度值差异明显,呈现明显的分区性(相对高应变速率区和相对低应变速率区),各区中应变速率对抗剪强度值的影响不同。
The results of triaxial shear experiments are influenced by experimental methods,and are closely related to the different experimental conditions and the loading rate. Taking a landslide as an example and combined with laboratory tests,this paper establishes a conglomeratic sliding-zone soil numerical test model and reveals different strain rate declines with the dynamic response rules of soil strength characteristics. The shear strength prediction model is also established. The results show that the values of the shear strength under different strain rates are markedly different,and show obvious zoning characteristics( high strain rate and low strain rate). The strain rate in different districts has different influences for the shear strength values.
The results of triaxial shear experiments are influenced by experimental methods,and are closely related to the different experimental conditions and the loading rate. Taking a landslide as an example and combined with laboratory tests,this paper establishes a conglomeratic sliding-zone soil numerical test model and reveals different strain rate declines with the dynamic response rules of soil strength characteristics. The shear strength prediction model is also established. The results show that the values of the shear strength under different strain rates are markedly different,and show obvious zoning characteristics( high strain rate and low strain rate). The strain rate in different districts has different influences for the shear strength values.
引文
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[2]张礼中,胡瑞林,李向全.土体微观结构定量分析系统及应用[J].地质科技情报,2008,27(1):108-112.[ZHANG L Z,HU R L,LI X Q.Soil microstructure quantitative analysis system and its application[J].Geological Science and Technology Information,2008,27(1):108-112.(in Chinese)]
[3]唐良琴,聂德新,任光明.软弱夹层粘粒含量与抗剪强度参数的关系分析[J].中国地质灾害与防治学报,2003,14(2):56-60.[TANG L Q,LIE D X,REN G M.The relational analysis between the clay grain content and strength characteristics of weak intercalated layer[J].The Chinese Journal of Geological Hazard and Control,2003,14(2):56-60.(in Chinese)]
[4]蔡羽,孔令伟,郭爱国,等.剪应变率对湛江强结构性黏土力学性状的影响[J].岩土力学,2006,27(8):1235-1239.[CAI Y,KONG L W,GUO A G,et al.Effects of shear strain rate on mechanical behavior of Zhanjiang strong structured clay[J].Rock and Soil Mechanics,2006,27(8):1235-1239.(in Chinese)]
[5]高彦斌,汪中为.应变速率对黏土不排水抗剪强度的影响[J].岩石力学与工程学报,2005,24(增刊2):5779-5783.[GAO Y B,WANG Z W.Effect of strain rate on undrained shear strength of clays[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Sup2):5779-5783.(in Chinese)]
[6]韩胜利,何昌荣,徐丽丽.剪切速率对心墙料应力-应变-强度特性影响[J].路基工程,2009(6):142-143.[HAN S L,HE C R,XU L L.Effect of shear rate on stress-strain-strength of material wall[J].Subgrade Engineering,2009(6):142-143.(in Chinese)]
[7]李长圣.含砾滑带土三轴剪切的精细数值模拟研究[D].南京:河海大学,2014.[LI C.Fine numerical simulation study of pebbly slip soil about triaxial shear[D].Nanjing:Hohai University,2014.(in Chinese)]
[8]徐鼎平,汪斌,江龙剑,等.冰碛土三轴数值模拟试验方法探讨[J].岩土力学,2008,29(12):3466-3470.[XU D P,WANG B,WANG L J,et al.Study of methods of triaxial numerical simulation test of glacial till[J].Rock and Soil Mechanics,2008,29(12):3466-3470.(in Chinese)]
[9]郭喜峰,晏鄂川,刘洋.三峡库区碎石土滑坡体抗剪强度研究[J].重庆交通大学学报(自然科学版),2015,34(1):68-71.[GUO X F,YAN E C,LIU Y.Shear strength of gravel soil landslide in the Three Gorges reservoir zone[J].Journal of Chongqing Jiaotong University(Natural Science),2015,34(1):68-71.(in Chinese)]
[10]陈德基.三峡工程地质研究[M].武汉:湖北科学技术出版社,1997:121-122.[CHEN D J.Engineering geology research of the three gorges reservoir[M].Wuhan:Hubei Sciences and Technology Press,1997:121-122.(in Chinese)]
[11]李翀,何昌荣,王琛,等.粗粒料大型三轴试验的尺寸效应研究[J].岩土力学,2008,29(增刊1):563-566.[LI C,HE C R,WANG C,et al.Study of scale effect of large-scale triaxial test of coarse-grained meterials[J].Rock and Soil Mechanics,2008,29(Sup1):563-566.(in Chinese)]