非饱和重塑Q3黄土抗剪强度分析  

Shear Strength Analysis on Unsaturated Remolded Q3 Loess

作　　者：鲁得文[1] 吴旭阳 熊玉莲 LU Dewen;WU Xuyang;XIONG Yulian(Yangling Vocational and Technical College,Yangling 712100,China;School of Civil and Transportation Engineering,Henan University of Urban Construction,Pingdingshan 467036,China;Lanzhou Jiaotong University,National Demonstration Center for Experimental Civil Engineering,Lanzhou 730070,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]杨凌职业技术学院,陕西杨凌712100 [2]河南城建学院土木与交通工程学院,河南平顶山467036 [3]土木工程国家级实验教学示范中心(兰州交通大学),甘肃兰州730070 [4]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《粉煤灰综合利用》2020年第1期37-40,140,共5页Fly Ash Comprehensive Utilization

基　　金：杨凌职业技术学院自然科学研究基金项目(A2018023)。

摘　　要：以宝兰客专隧道典型黄土为研究背景,探讨了含水率对重塑Q3黄土抗剪特性的影响,并通过数据拟合得到重塑Q3黄土破坏强度与含水率之间的关系表达式。结果表明:随着含水率的增加,土样的破坏强度随之减小;在同一含水率下,随着围压的增加,其抗剪强度逐渐增大。在低围压下试样有明显的峰值,为脆性破坏;在较高围压下试样为塑性破坏。含水率较低时,剪应变呈现出应变软化及弱硬化状态;含水率较高时,剪应变呈现出硬化及强硬化状态。在轴向应变较小时,重塑Q3黄土的应力-应变呈现出近似线性的关系;当轴向应变较大时,应力-应变呈现出高度的非线性关系。通过线性回归方法以围压和含水率数据回归出重塑黄土的破坏强度计算式,对比计算数据和实测数据,发现它们之间的相对误差较小,实测值与计算值的变化趋势基本一致,本研究成果可以为类似工程提供依据。Taking Baoji-Lanzhou Passenger Dedicated Lines as the engineering background,the influence of moisture content on the shear behavior of remolded loess was discussed,and the relationship formula between the failure strength and moisture content of remolded loess was obtained by data fitting.There are following results:With the increase of moisture content,the failure strength of soil samples decreases,at the same moisture content,the shear strength increases with the increase of confining pressure.The sample with peak value is brittle failure under low confining pressure while it is plastic failure under high confining pressure.The shear strain exhibits the state of strain softening and weak hardening when the water content is low,while it exhibits the state of hardening and strong hardening when the water content is high.The stressstrain relationship of remolded loess is approximately linear when the axial strain is small,while it shows a highly nonlinear relationship when the axial strain increased.The linear regression method was used to calculate the failure strength of remolded loess with confining pressure and water content data.By comparing the calculated data with the measured data,it was found that the relative error between them is small,and the measured value and calculated value basically has the same trend.The research results can provide a basis for similar projects.

关 键 词：重塑黄土 抗剪强度 含水率 线性回归 

分 类 号：TU441[建筑科学—岩土工程]