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.
[1]赵羽,金争平,史培军,等. 内蒙古土壤侵蚀研究[M].北京: 科学出版社,1989.[2]王泉,马巍,张泽,等. 冻融循环对黄土二次湿陷特性的影响研究[J]. 冰川冻土,2013,35(2):376-382. WANG Quan, MA Wei, ZHANG Yi, et al. Research on the secondary collapse properties of loess under freeze-thaw cycle [J]. Journal of glaciology and geocryology, 2013, 35(2):376-382.(in Chinese)[3]田俊峰,叶万军,杨更社. 含水量及冻融循环对阳曲黄土压缩特性的影响分析[J]. 地下空间与工程学报,2015,11(4):933-939. TIAN Junfeng, YE Wanjun, YANG Gengshe. Analysis on influence of moisture content and freeze thaw cycle on compression characteristics of loess in Yangqu Region,Shanxi Province [J]. Chinese journal of underground space and engineering, 2015,11(4):933-939.(in Chinese)[4]穆彦虎,马巍,李国玉,等. 冻融作用对压实黄土结构影响的微观定量研究[J]. 岩土工程学报,2011, 33(12):1919-1925. MU Yanhu, MA Wei, LI Guoyu,et al. Quantitative analysis of impacts of freeze-thaw cycles upon microstructure of compacted loess [J]. Chinese journal of geotechnical engineering, 2011, 33(12):1919-1925.(in Chinese)[5]ERIK S, UIF I. Soil behavior during freezing and thawing using variable and constant confining pressure triaxial tests[J]. Canadian geotechnical journal, 2001, 38(4): 863-875.[6]YAO Xiaobang, QI Jilin, MA Wei. Influence of freeze-thaw on the stored free energy in soils[J]. Cold regions science and technology, 2009, 56(2/3): 115-119.[7]于琳琳,徐学燕,邱明国,等. 冻融作用对饱和粉质黏土抗剪性能的影响[J]. 岩土力学,2010,31(8):2448-2452. YU Linlin, XU Xueyan, QIU Mingguo, et al. Influnce of freeze-thaw on shear strength properties of saturated silty clay [J]. Rock and soil mechanics, 2010, 31(8):2448-2452.(in Chinese)[8]李明玉,李晓丽,陈溯航,等. 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. LI Mingyu,LI Xiaoli,CHEN Suhang, et al. Effects of freeze-thaw cycles on mechanical properties of Ordos remolded Pisha-sandstone soil[J]. Journal of drainage and irrigation machinery engineering, 2016, 34(10): 897-903.(in Chinese)[9]王伟,池旭超,张芳,等. 冻融循环对滨海软土三轴应力应变曲线软化特性的影响[J]. 岩土工程学报,2013,35(2):140-144. WANG Wei, CHI Xuchao, ZHANG Fang, et al. Effect of freeze-thaw circles on softening behaviors of triaxial stress-strain curve of costal soft soils [J]. Chinese Journal of geotechnical engineering, 2013, 35(2):140-144.(in Chinese)[10]胡再强,刘寅,李宏儒. 冻融循环作用对黄土强度影响的试验研究[J]. 水利学报,2014,45(2):14-18. HU Zaiqiang, LIU Ying, LI Hongru. Influence of free-zing-thawing cycles on strength of loess [J].Journal of hydraulic engineering. 2014, 45(2):14-18.(in Chinese)[11]方丽莉,齐吉琳,马巍. 冻融作用对土结构性的影响及其导致的强度变化[J]. 冰川冻土,2012,34(2):435-440. FANG Lili, QI Jilin, MA Wei. Freeze-thaw induced changes in soil structure and its relationship with variations in strength [J].Journal of glaciology and geocryo-logy, 2012, 34(2):435-440.(in Chinese)[12]常丹,刘建坤,李旭,等. 冻融循环对青藏粉砂土力学性质影响的试验研究[J]. 岩石力学与工程学报,2014,33(7):1496-1502. CHANG Dan, LIU Jiankun, LI Xu, et al. Experiment study of effects of freezing-thawing cycles on mechanical properties of QingHat-Tibet silty sand [J]. Chinese journal of rock mechanics and engineering, 2014, 33(7):1496-1502.(in Chinese)[13]张慧梅,张蒙军,谢祥妙,等. 冻融循环条件下红砂岩物理力学特性试验研究[J]. 太原理工大学学报,2015,46(1):69-74. ZHANG Huimei, ZHANG Mengjun, XIE Xiangmiao, et al. The experimental study on the physical and mechanical properties of red sandstone under the action of freeze-thaw cycles [J]. Journal of Taiyuan University of Technology, 2015, 46(1):69-74.(in Chinese)[14]李晓丽,于际伟,刘李杰. 鄂尔多斯砒砂岩土壤侵蚀与气候条件关系的研究[J]. 内蒙古农业大学学报,2014,35(3):105-109. LI Xiaoli, YU Jiwei, LIU Lijie. Study on relationship between Pisha-Standstone soil erosion and climatic conditions of Ordos [J]. Journal of Inner Mongolia Agricultural University, 2014, 35(3):105-109.(in Chinese)[15]南京水利科学研究院.土工试验规程 SL237-1999[S]. 北京:中国水利水电出版社, 1999.
