冻融循环对掺砾黏土体积变化和力学特性影响的试验研究

doi:10.13722/j.cnki.jrme.2021.0003

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1137 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为研究冻融循环作用对掺砾黏土体积变化和力学特性的影响，首先对掺砾黏土试样开展冻融试验，得出试样在冻结时发生体积收缩，并且试样高度收缩率小于直径的收缩率；当冻融循环次数超过5次后，试样体积趋于稳定。此外，对不同冻融循环次数、围压下的掺砾黏土试样开展不固结不排水三轴压缩试验，研究冻融循环后试样的应力–应变关系曲线、破坏强度、弹性模量、抗剪强度参数的变化规律。试验结果表明：掺砾黏土的力学特性受冻融循环影响显著，但冻融循环作用并不改变应力–应变曲线形态。试样经历第1次冻融循环后其破坏强度急剧降低，当冻融次数超过2次后，试样的破坏强度表现出随着冻融循环次数的增加先缓慢降低后缓慢增大的趋势。各围压下试样的弹性模量均随冻融循环次数的增加先降低后增大，在经历4～6次冻融作用后弹性模量达到最小值。试样的黏聚力随着冻融循环次数的增加呈现出先减小后略有增大趋势，但内摩擦角几乎不受冻融循环作用的影响。建议在季冻区进行掺砾黏土料的工程设计时可采用6次冻融循环作用后的强度指标作为设计参数。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	张勇敢1
	鲁洋1
	2
	刘斯宏1
	张呈斌1

关键词 ：土力学, 掺砾黏土, 冻融循环, 三轴压缩试验, 体积变化, 力学特性

Abstract：In order to study the effects of freeze-thaw cycles on the volume changes and mechanical properties of clay-gravel mixtures，the freeze-thaw test was carried out on clay-gravel mixtures，and it was concluded that the sample volume will shrink when frozen，and the sample height shrinkage is less than the diameter shrinkage. When the number of freeze-thaw cycles exceeds 5 times，the sample volume tends to be stable. Besides，a series of unconsolidated and undrained triaxial tests were conducted with the different numbers of freeze-thaw cycles under various confining pressures，and the stress-strain behavior，failure strength，elastic modulus，cohesion and angle of internal friction were analyzed. The testing results show that the mechanical properties of clay-gravel mixtures are affected considerably，but the shape of the stress-strain curve doesn?t be influenced by the freeze-thaw cycles. After the first freeze-thaw cycle，the failure strength of the sample decreased sharply，and when the number of freeze-thaw cycles exceeds 2 times，the failure strength of the sample shows a trend of slowly decreasing first and then increasing slowly as the number of freeze-thaw cycles increases. The elastic modulus under various confining pressures decreases first and then increases with the increase of the number of freeze-thaw cycles，and the samples will get a minimum elastic modulus after 4–6 freeze-thaw cycles. The cohesion decreases first and then increases slowly as the number of freeze-thaw cycles increases，but the angle of internal friction is almost unaffected by freeze-thaw cycles. It is suggested that the strength parameter after 6 freeze-thaw cycles can be used as design parameters for engineering design of clay-gravel mixtures in seasonally frozen regions.

Key words： soil mechanics clay-gravel mixture freeze-thaw cycle triaxial compression test volume changes mechanical properties

引用本文:

张勇敢1，鲁洋1，2，刘斯宏1，张呈斌1. 冻融循环对掺砾黏土体积变化和力学特性影响的试验研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3323-3333.
ZHANG Yonggan1，LU Yang1，2，LIU Sihong1，ZHANG Chengbin1. Effects of cyclic freezing and thawing on volume changes and mechanical properties of clay-gravel mixtures. , 2021, 40(S2): 3323-3333.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0003 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3323

[3]	马巍，王大雁. 冻土力学[M]. 北京：科学出版社，2014：39-41.(MA Wei，WANG Dayan. Frozen soil mechanics[M]. Beijing：Science Press，2014：39-41.(in Chinese))
[8]	KUMAR G V，WOOD D M. Fall cone and compression tests on clay-gravel mixtures[J]. Géotechnique，1999，49(6)：727-739.
[18]	陈涛，毕贵权，陈国良，等. 冻融循环对黏质粗粒土单轴抗压性能影响的试验研究[J]. 冰川冻土，2019，41(3)：587-594.(CHEN Tao，BI Guiquan，CHEN Guoliang，et al. Laboratory study on effect of cyclic freeze-thaw on the uniaxial compressive properties of clayey coarse grained soils[J]. Journal of Glaciology and Geocryology，2019，41(3)：587-594.(in Chinese))
[28]	殷宗泽. 土工原理[M]. 北京：中国水利水电出版社，2007：209-210.(YIN Zongze. Geotechnical theory and computing[M]. Beijing：China Water Power Press，2007：209-210.(in Chinese))
[7]	任秀玲，俞祁浩，王金国，等. 黏土单向冻融作用下冷生构造及冻胀特性试验研究[J]. 水利学报，2021，52(1)：81-92.(REN Xiuling，YU Qihao，WANG Jinguo，et al. Experimental study on the characteristics of cry structure and frost heave of clay under one-dimensional freeze-thaw[J]. Journal of Hydraulic Engineering，2021，52(1)：81-92.(in Chinese))
[10]	FEI K. Experimental study of the mechanical behavior of clay-aggregate mixtures[J]. Engineering Geology，2016，210：1-9.
[11]	张勇敢，鲁洋，刘斯宏，等. 温度和掺砾量对冻结掺砾黏土单轴压缩特性影响的试验研究[J]. 岩石力学与工程学报，2019，38(11)：2 357-2 364.(ZHANG Yonggan，LU Yang，LIU Sihong，et al. Influence of temperature and gravel content on uniaxial compressive characteristics of frozen gravel-mixed clays[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(11)：2 357- 2 364.(in Chinese))
[13]	张泽，马巍，齐吉琳. 冻融循环作用下土体结构演化规律及其工程性质改变机制[J]. 吉林大学学报：地球科学版，2013，43(6)：1 904-1 914.(ZHANG Ze，MA Wei，QI Jilin. Structure evolution and mechanism of engineering properties change of soils under effect of freeze-thaw cycle[J]. Journal of Jilin University：Earth Science，2013，43(6)：1 904-1 914.(in Chinese))
[30]	齐吉琳，马巍. 冻融作用对超固结土强度的影响[J]. 岩土工程学报，2006，28(12)：2 082-2 086.(QI Jilin，MA Wei. Influence of freezing-thawing on strength of overconsolidated soils[J]. Chinese Journal of Geotechnical Engineering，2006，28(12)：2 082-2 086.(in Chinese))
[15]	刘寒冰，张互助，王静. 冻融及含水率对压实黏质土力学性质的影响[J]. 岩土力学，2018，39(1)：158-164.(LIU Hanbing，ZHANG Huzhu，WANG Jing. Effect of freeze-thaw and water content on mechanical properties of compacted clayey soil[J]. Rock and Soil Mechanics，2018，39(1)：158-164.(in Chinese))
[17]	王铁行，罗少锋，刘小军. 考虑含水率影响的非饱和原状黄土冻融强度试验研究[J]. 岩土力学，2010，31(8)：2 378-2 382.(WANG Tiehang，LUO Shaofeng，LIU Xiaojun. Testing study of freezing-thawing strength of unsaturated undisturbed loess considering influence of moisture content[J]. Rock and Soil Mechanics，2010，31(8)：2 378- 2 382.(in Chinese))
[20]	刘建坤，于钱米，刘景宇，等. 细粒土不均匀分布对粗粒土力学特性的影响[J]. 岩土工程学报，2017，39(3)：562-572.(LIU Jiankun，YU Qianmi，LIU Jingyu，et al. Influence of non-uniform distribution of fine soil on mechanical properties of coarse-grained soil[J]. Chinese Journal of Geotechnical Engineering，2017，39(3)：562-572.(in Chinese))
[21]	TIAN S，TANG L，LING X，et al. Cyclic behaviour of coarse-grained materials exposed to freeze-thaw cycles：Experimental evidence and evolution model[J]. Cold Regions Science and Technology，2019，167：102 815.
[23]	鲁洋，许雷，刘斯宏，等. 一种重塑土分层击样装置及其制样方法[P]. 中国：201510083904. X，2017-05-03.(LU Yang，XU Lei，LIU Sihong，et al. A stratified sample preparation device for remolded soils and its method：[P]. China 201510083904.X，2017-05-03.(in Chinese))
[25]	WANG D，MA W，NIU Y，et al. Effects of cyclic freezing and thawing on mechanical properties of Qinghai—Tibet clay[J]. Cold Regions Science and Technology，2007，48(1)：34-43.
[27]	LU Y，LIU S H，ALONSO E，et al. Volume changes and mechanical degradation of a compacted expansive soil under freeze-thaw cycles[J]. Cold Regions Science and Technology，2019，157：206-214.
[31]	穆彦虎，陈涛，陈国良，等. 冻融循环对黏质粗粒土抗剪强度影响的试验研究[J]. 防灾减灾工程学报，2019，39(3)：375-386.(MU Yanhu，CHEN Tao，CHEN Guoliang，et al. Experimental study on effect of cyclic freeze-thaw on shear behaviors of clayey coarse-grained soil[J]. Journal of Disaster Prevention and Mitigation，2019，39(3)：375-386.(in Chinese))
[33]	张庆龙. 土石方压实监控系统及其应用研究[博士学位论文][D]. 北京：清华大学，2018.(ZHAG Qinglong. Study on the compaction monitoring system of earthwork and its application[Ph. D. Thesis][D]. Beijing：Tsinghua University，2018.(in Chinese))
[6]	穆彦虎，朱忻怡，岳攀，等. 寒区大坝心墙土料冬季冻融与防控监测[J]. 冰川冻土，2018，40(4)：756-763.(MU Yanhu，ZHU Xinyi，YUE Pan，et al. Monitoring investigation on winter freezing-thawing of dam core wall soils in cold regions[J]. Journal of Glaciology and Geocryology，2018，40(4)：756-763.(in Chinese))
[16]	常丹，刘建坤，李旭. 冻融循环下粉砂土屈服及强度特性的试验研究[J]. 岩石力学与工程学报，2015，34(8)：1 721-1 728. (CHANG Dan，LIU Jiankun，LI Xu. Experimental study on yielding and strength properties of silty sand under freezing-thawing cycles[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(8)：1 721-1 728.(in Chinese))
[26]	LIU J，CHANG D，YU Q. Influence of freeze-thaw cycles on mechanical properties of a silty sand[J]. Engineering Geology，2016，210：23-32.
[4]	沈珠江. 抗风化设计——未来岩土工程设计的一个重要内容[J]. 岩土工程学报，2004，26(6)：866-869.(SHEN Zhujiang. Weathering resistant design—An important aspect of future development of geotechnical engineering design[J]. Chinese Journal of Geotechnical Engineering，2004，26(6)：866-869.(in Chinese))
[14]	齐吉琳，程国栋，VERMEER P A. 冻融作用对土工程性质影响的研究现状[J]. 地球科学进展，2005，20(8)：887-894.(QI Jilin，CHENG Guodong，VERMEER P A. State-of-the-art of influence of freeze-thaw on engineering properties of soils[J]. Advances in Earth Sciences，2005，20(8)：887-894.(in Chinese))
[24]	ZHAO J，ZHANG P，YANG X，et al. On the uniaxial compression strength of frozen gravelly soils[J]. Cold Regions Science and Technology，2020，171：102 965.
[1]	周幼吾，郭东信. 我国多年冻土的主要特征[J]. 冰川冻土，1982，4(1)：1-19.(ZHOU Youwu，GUO Dongxin. Principal characteristics of permafrost in China[J]. Journal of Glaciology and Geocryology，1982，4(1)：1-19.(in Chinese))
[34]	王大雁，朱元林，赵淑萍，等. 超声波法测定冻土动弹性力学参数试验研究[J]. 岩土工程学报，2002，24(5)：612-615.(WANG Dayan，ZHU Yuanlin，ZHAO Shuping，et al. Study on experimental determination of the dynamic elastic mechanical parameters of frozen soil by ultrasonic technique[J]. Chinese Journal of Geotechnical Engineering，2002，24(5)：612-615.(in Chinese))
[2]	徐敩祖，王家澄，张立新. 冻土物理学[M]. 北京：科学出版社，2001：1-2.(XU Xiaozu，WANG Jiacheng，ZHANG Lixin. Physics of frozen soils[M]. Beijing：Science Press，2001：1-2.(in Chinese))
[9]	JAFARI M K，SHAFIEE A. Mechanical behavior of compacted composite clays[J]. Canadian Geotechnical Journal，2004，41(6)：1 152-1 167.
[5]	MA H，CHI F. Major technologies for safe construction of high earth-rockfill dams[J]. Engineering，2016，2(4)：498-509.
[12]	LIU X，LIU E，ZHANG D，et al. Study on effect of coarse-grained content on the mechanical properties of frozen mixed soils[J]. Cold Regions Science and Technology，2019，158：237-251.
[35]	李广信. 高等土力学[M]. 北京：清华大学出版社，2004：140-146.(LI Guangxin. Advanced soil mechanics[M]. Beijing：Tsinghua University Press，2004：140-146.(in Chinese))
[19]	卜建清，王天亮. 冻融及细粒含量对粗粒土力学性质影响的试验研究[J]. 岩土工程学报，2015，37(4)：608-614.(BU Jianqing，WANG Tianliang. Influences of freeze-thaw and fines content on mechanical properties of coarse-grained soil[J]. Chinese Journal of Geotechnical Engineering，2015，37(4)：608-614.(in Chinese))
[22]	中华人民共和国行业标准编写组. SL237—1999土工试验规程[S]. 北京：中国水利水电出版社，1999.(The Professional Standards Compilation Group of Peoples? Republic of China. SL237—1999 Specification of soil test[S]. Beijing：China Water Power Press，1999.(in Chinese))
[29]	姚仰平，罗汀，侯伟. 土的本构关系[M]. 2版. 北京：人民交通出版社，2018：2-7.(YAO Yangping，LUO Ting，HOU Wei. Soil constitutive models[M]. 2nd ed. Beijing：China Communications Press，2018：2-7.(in Chinese))
[32]	CHAMBERLAIN E J，GOW A J. Effect of freezing and thawing on the permeability and structure of soils[J]. Engineering Geology，1979，13(1)：73-92.