排灌机械工程学报
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排灌机械工程学报  2018, Vol. 36 Issue (2): 179-184    DOI: 10.3969/j.issn.1674-8530.16.0315
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砒砂岩重塑土强度和应力-应变曲线试验研究
李明玉, 李晓丽*, 陈溯航, 张强, 常平, 邬尚贇
内蒙古农业大学水利与土木建筑工程学院, 内蒙古 呼和浩特, 010018
Experiment study of effects of strength and stress-strain curve characteristics of Ordos Pisha-sandstone remolded soil
LI Mingyu, LI Xiaoli*, CHEN Suhang, ZHANG Qiang, CHANG Ping, WU Shangyun
College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China
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摘要 以内蒙古鄂尔多斯市南部准格尔旗作为研究区域,以当地紫红色砒砂岩重塑土为研究对象,使用TSZ-6A全自动静三轴仪,在常温下进行不同冻融循环次数、不同围压下的三轴剪切试验来分析砒砂岩的变形情况.研究结果表明:在每个冻融循环次数的不同围压下,砒砂岩重塑土试样的应力-应变曲线都呈现出应变硬化的特性,并且从应力-应变曲线分布上,大致都经历了3个阶段:近似完全弹性阶段、应变硬化阶段、屈服阶段.为了定量地分析了不同冻融循环次数下砒砂岩的强度参数,引入强度参数劣化系数KCKφ,通过劣化系数曲线拟合得出强度参数劣化趋势函数.通过比较不同冻融循环次数下,砒砂岩重塑土峰值强度与残余强度的大小关系,分析了砒砂岩重塑土的应力-应变曲线软、硬化特性,并引入系数Kq来更直观地分析砒砂岩的变形情况.
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李明玉
李晓丽*
陈溯航
张强
常平
邬尚贇
关键词砒砂岩   冻融循环   围压   应力-应变曲线   劣化系数     
Abstract: The research area of this research project is Zhungeer Banner in the southern part of Erdos, Inner Mongolia, with the local reddish purple sandstone remolded soil as the research object. This test is conducted under different numbers of freeze-thaw cycle and different confining pressure by using TSZ-6A full automatic static triaxial apparatus. The results show that: in each of the freeze-thaw cycles under different confining pressure, Pisha-sandstone remolded soil stress-strain curve presents the characteristics of the strain hardening; stress-strain curve roughly experiences three stages with the increase of axial strain: Nearly completer elastic range and Strain hardening stage and Yielding stage. In order to quantitatively analyze the strength parameters of Pisha-sandstone under different freeze-thaw cycles, the strength parameter degradation coefficients KC and KΦ were introduced, and the degradation trend function of strength parameters was obtained by fitting the degradation coefficient curve.Then analyze the hardening properties and softening properties of stress-strain curve of Pisha-sandstone remolded soil after comparing the relationship between Pisha-sandstone peak strength and residual strength under different numbers of freeze-thaw cycle. Utilize Kq to analyze the deformation of Pisha-sandstone directly.
Key wordsPisha-sandstone   freeze-thaw cycles   confining pressure   stress-strain curve   deterioration factor   
收稿日期: 2016-12-23;
基金资助:

国家自然科学基金资助项目(41261070,41561061);教育部创新团队发展计划项目(IRT13069)

引用本文:   
李明玉,李晓丽*,陈溯航等. 砒砂岩重塑土强度和应力-应变曲线试验研究[J]. 排灌机械工程学报, 2018, 36(2): 179-184.
LI Ming-Yu,LI Xiao-Li-*,CHEN Su-Hang et al. Experiment study of effects of strength and stress-strain curve characteristics of Ordos Pisha-sandstone remolded soil[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(2): 179-184.
 
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[1] 李明玉, 李晓丽, 陈溯航, 张强. 冻融循环对鄂尔多斯砒砂岩重塑土样力学性能影响[J]. 排灌机械工程学报, 2016, 34(10): 897-903.

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