[1]喻豪俊,刘恩龙,李荣建.饱和重塑黄土动力特性及残余变形规律研究[J].自然灾害学报,2018,27(06):186-196.[doi:10.13577/j.jnd.2018.0624]
 YU Haojun,LIU Enlong,LI Rongjian.Dynamic characteristics and residual deformation of saturated remolded loesses[J].,2018,27(06):186-196.[doi:10.13577/j.jnd.2018.0624]
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饱和重塑黄土动力特性及残余变形规律研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
27
期数:
2018年06期
页码:
186-196
栏目:
出版日期:
2018-12-28

文章信息/Info

Title:
Dynamic characteristics and residual deformation of saturated remolded loesses
作者:
喻豪俊1 刘恩龙1 李荣建2
1. 四川大学 水力学与山区河流开发保护国家重点实验室 水利水电学院, 四川 成都 610065;
2. 西安理工大学 岩土工程研究所, 陕西 西安 710048
Author(s):
YU Haojun1 LIU Enlong1 LI Rongjian2
1. State Key Lab. of Hydraulics and Mountain River Eng., College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China;
2. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China
关键词:
饱和黄土动三轴试验固结排水固结不排水动力特性残余变形
Keywords:
saturated loessdynamic triaxial testconsolidation drainedconsolidation undraineddynamic characteristicsresidual deformation
分类号:
TU41
DOI:
10.13577/j.jnd.2018.0624
摘要:
在不同固结条件下对饱和重塑黄土进行动三轴试验,探讨了饱和重塑黄土在固结排水下的动应力应变、体变、残余应变特性,以及固结不排水条件下的动孔压、有效应力路径等特性。并基于三轴试验结果,修正了残余剪应变增量、残余体积应变增量的经验公式。试验结果表明:排水条件下,动应力、围压和固结应力比变化对饱和重塑黄土的体变曲线形态和体变值有较大影响。在均压固结和偏压固结条件下饱和重塑黄土均产生较大的残余应变,围压、动应力变化对残余应变增长曲线基本上无影响。残余剪应变比增长曲线在均压固结和偏压固结时具有相同的形态,都可以用指数函数来描述;而残余体变比-振次比关系在均压固结时呈线性分布,而偏压固结时呈指数型分布。不排水条件下,随着固结应力比的增大,孔压增长曲线由明显上凸型向微凸型转变,孔压比的增长速率也随着围压的增大而减小。
Abstract:
Based on dynamic triaxial tests conducted on saturated remolded loess under different consolidation conditions, the characteristics of dynamic stress-strain, volume strain, residual strain under consolidated-drained conditions and dynamic pore water pressure, effective stress path under consolidated-undrained condition are studied. Then based on the test results, the empirical formula of residual shear strain increment, residual volume strain increment were modified. It is indicated that:under drained conditions, the curve shape and value of volume strain is affected greatly by the dynamic stress, variation of confining pressure and consolidation stress ratio. The great residual strain can be resulted under both isotropic consolidation and anisotropic consolidation, but the relationships between residual strain and number of cycles are hardly affected by the variation of confining pressure and dynamic stress. The curve shape of residual shear strain ratio under isotropic consolidation is the same as that under anisotropic consolidation, and the relationship between residual shear strain ratio and cycle times ratio could be described by exponential function. The relationship between residual volume strain ratio and cycle number ratio could be described by linear function under isotropic consolidations and by exponential function under anisotropic consolidations. Under undrained conditions, the shape of pore water pressure developing curve changes from obvious-convex to micro-convex as long as the consolidation ratio increases, and the growth of pore water pressure ratio decreases with the increasing confining pressure.

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备注/Memo

备注/Memo:
收稿日期:2018-09-10;改回日期:2018-10-15。
作者简介:喻豪俊(1989-),男,博士生,主要从事岩土力学方面的研究.E-mail:yuhaojun08@stu.scu.edu.cn
通讯作者:刘恩龙(1976-),男,教授,博士,主要从事岩土材料本构关系及数值模拟方面的研究.E-mail:liuenlong@scu.edu.cn
更新日期/Last Update: 1900-01-01