Q_(2)重塑黄土强度与变形特性的试验研究  

Experimental Study on Strength and Deformation Characteristics of Q_(2)Remolded Loess

作　　者：符金娥 庄立普 徐晓东 张雪云 李青 FU Jin’e;ZHUANG Lipu;XU Xiaodong;ZHANG Xueyun;LI Qing(Zhonglan Railway Passenger Dedicated Line Co.,Ltd.,Lanzhou,Gansu 730000,China;Gansu Academy of Civil Engineering Science Co.,Ltd.,Lanzhou,Gansu 730000,China)

机构地区：[1]中兰铁路客运专线有限公司,甘肃兰州730000 [2]甘肃土木工程科学研究院有限公司,甘肃兰州730000

出　　处：《水利与建筑工程学报》2022年第5期155-159,共5页Journal of Water Resources and Architectural Engineering

基　　金：甘肃省住房和城乡建设厅建设科技项目(JK2021-46,JK2021-55)。

摘　　要：为了研究Q_(2)重塑黄土的强度特性及变形特性,采用改进的非饱和土三轴仪进行三轴固结排水剪切试验,试验过程中控制吸力、净围压均为常数。试验结果表明:相同吸力下,随着净围压增大,试样的偏应力越来越大,相同净围压下,随着吸力的增大,试样的偏应力也逐渐增大;不同应力状态下,剪切初期试样的偏应力随轴向应变的增加变化较大,而后应力随应变的变化逐渐减小;试样刚开始剪切时,如果吸力较大会出现轻微的剪胀现象,但并不明显,吸力较小的试样在剪切过程中基本都处于剪缩状态;吸力越大,土体的表观黏聚力c及参数k也就越大,但吸力的变化对有效内摩擦角φ′及参数n影响不大。In order to analyze the strength and deformation characteristics of Q_(2)remolded loess,nine triaxial consolidation drainage shear tests with constant net confining pressure and controlled suction were carried out with unsaturated soil triaxial apparatus.The results show that under the same suction,the deviatoric stress increases with the increase of net confining pressure,and the deviatoric stress increases with the increase of suction under the same net confining pressure.The apparent cohesion c and the parameter k of soil increase with the increase of suction,but the effects of suction on the effective internal friction angleφ′and parameter n is small.

关 键 词：非饱和特性 Q_(2)重塑黄土 三轴剪切试验 强度特性 

分 类 号：TU411.3[建筑科学—岩土工程]