首页 | 本学科首页   官方微博 | 高级检索  
     检索      

崩岗区岩土抗剪强度主要影响因素及衰减机理分析
引用本文:张晓明,丁树文,蔡崇法,林辉.崩岗区岩土抗剪强度主要影响因素及衰减机理分析[J].安徽农业科学,2012,40(9):5534-5537,5581.
作者姓名:张晓明  丁树文  蔡崇法  林辉
作者单位:华中农业大学资源与环境学院,湖北武汉,430070
基金项目:中央高校基本科研业务费专项(2009QC035);华中农业大学科研启动资金项目(52204-08077);“十二五”国家科技支撑计划项目(2011BAD31B00)
摘    要:根据崩岗侵蚀区红土发育于花岗岩且受干湿变化影响显著的性质,通过室内直剪试验,分析了5种干湿效应水平(风干48 h、风干24 h、自然含水率、浸水30 s和浸水60 s)崩岗侵蚀区岩土抗剪强度变化规律,并运用灰色关联法研究了影响岩土抗剪强度指标的主要因素。结果表明,土壤黏聚力c和内摩擦角φ随干湿变化呈非线性衰减趋势;在风干阶段影响抗剪强度前3个主要因素大小依次为塑性指数游离氧化铁黏粒含量,主要受裂隙性影响,而在增湿阶段影响程度大小依次为干密度水溶性盐黏粒含量,基质吸力是控制抗剪强度衰减的主要因素。

关 键 词:抗剪强度  黏聚力  灰色关联法  内摩擦角

Analysis of Decay Mechanism and Influence Factors of Soil Anti-shear Strength in Slope Disintegration Erosion Area
Institution:ZHANG Xiao-ming et al(College of Resources and Environment,Huazhong Agricultural University,Wuhan,Hubei 430070)
Abstract:According to the properties of red soil derived from granite in slope disintegration area and influenced significantly by wetting and drying,the variation law of anti-shear strength was analyzed under five soil wetting and drying treatments(drying 48 h,drying 24 h,natural water content,wetting 30 s,wetting 60 s) by direct shearing test.The main influencing factors of soil anti-shear strength index were studied by using gray relational method.The results showed that soil cohesive forceand internal frictional angle φ decline with variation of drying and wetting levels;anti-shear strength is dominantly affected by crack evolution during drying period,the order of the effects of the influence factors on cohesion is plasticity index>free iron oxide>clay content,while matrix suction is the main factor for anti-shear strength decline during wetting period,the order of the effects of the influence factors on cohesion is dry density>water soluble salt>clay content.
Keywords:Anti-shear strength  Cohesion  Grey relational method  Internal frictional angle
本文献已被 CNKI 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号