冻融循环对黏质粗粒土单轴抗压性能影响的试验研究
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摘要
循环冻融作用下粗粒土的力学性质对于高寒地区边坡稳定性分析意义重大。以藏区某一排土场土体作为依托,开展了不同冻融循环次数后不同级配黏质粗粒土的单轴压缩试验,研究冻融循环作用对黏质粗粒土单轴抗压性能的影响。结果表明:冻融循环作用对黏质粗粒土应力-应变关系曲线性状及破坏模式有一定的影响,可使其应变呈现由脆性破坏(软化)向塑性流动(硬化)变化的规律。当提高冻融循环次数时,该类土体的弹模和抗压强度均显著减小,其中5～9次冻融循环前减小幅度较大,之后基本保持不变。单轴抗压性能的弱化与土样循环冻融过程中伴随的细颗粒团聚、大中孔隙增多、密实度下降有关。20次冻融循环后,该土质土样抗压强度、弹模最大降低幅度各自高达43%和77%。可见随着提高细砾组的含量,土样的抗压强度和弹模均呈现下降的趋势,这与该土样内粗、细土颗粒的比例及强度发挥机理密切相关。粗粒土单轴抗压破坏应变随冻融循环次数和细砾组含量的增加有一定的增加趋势。
The mechanical property of coarse grained soil under freeze-thaw cycle is very important in slope stability analyses in cold regions. To study the effect of freeze-thaw cycles on the compressive property of clayed coarse grained soil,a series of uniaxial compression tests on clayed coarse grained soils under different freezethaw cycles and fine gravel contents have been carried out. The test results indicate that freeze-thaw cycles has an impact on stress-strain relationship characteristics and failure mode of clayed coarse grained soils,The strain changes from brittle failure(softening)to plastic flow(hardening). When the number of freeze-thaw cycles is increased,the elastic modulus and compressive strength of such soils decrease significantly. Among them,5-9 freeze-thaw cycles decreased greatly before freezing and thawing cycles,and remained unchanged after freezing and thawing cycles. After that,these maintain almost stable. The uniaxial compressive properties weaken is related to aggregation of fine particles,increase of large and medium pores,and decrease of density during freezethaw processes. After20 cycles of freeze-thaw,the uniaxial compressive strength and the elastic modulus decreased by as much as43% and77%,respectively. With increase of fine gravel contents,the uniaxial compressive strength and the elastic modulus of coarse grained soil also reduces considerably. This is closely related to the proportion of coarse and fine soil particles in the soil sample and the mechanism of strength exertion. There is a minor increasing trend for the failing strain of coarse grained soil with the increase of the freeze-thaw cycles and the fine gravel contents.
The mechanical property of coarse grained soil under freeze-thaw cycle is very important in slope stability analyses in cold regions. To study the effect of freeze-thaw cycles on the compressive property of clayed coarse grained soil,a series of uniaxial compression tests on clayed coarse grained soils under different freezethaw cycles and fine gravel contents have been carried out. The test results indicate that freeze-thaw cycles has an impact on stress-strain relationship characteristics and failure mode of clayed coarse grained soils,The strain changes from brittle failure(softening)to plastic flow(hardening). When the number of freeze-thaw cycles is increased,the elastic modulus and compressive strength of such soils decrease significantly. Among them,5-9 freeze-thaw cycles decreased greatly before freezing and thawing cycles,and remained unchanged after freezing and thawing cycles. After that,these maintain almost stable. The uniaxial compressive properties weaken is related to aggregation of fine particles,increase of large and medium pores,and decrease of density during freezethaw processes. After20 cycles of freeze-thaw,the uniaxial compressive strength and the elastic modulus decreased by as much as43% and77%,respectively. With increase of fine gravel contents,the uniaxial compressive strength and the elastic modulus of coarse grained soil also reduces considerably. This is closely related to the proportion of coarse and fine soil particles in the soil sample and the mechanism of strength exertion. There is a minor increasing trend for the failing strain of coarse grained soil with the increase of the freeze-thaw cycles and the fine gravel contents.
引文
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[3]Deng Shixue.The slide analysis and synthetic managing method of dump in Taihe Iron Mine[J].Non-Ferrous Mining and Metallurgy,2002(4):7-9.[邓世学.太和铁矿排土场滑坡分析及治理措施[J].有色矿冶,2002(4):7-9.]
[4]Kong Xiangzhi,Hu Yingchun.Advantages,emphases and countermeasures on the development of mineral resources in China’s western region[J].Journal of China University of Geosciences(Social Sciences Edition),2003,3(6):7-11.[孔祥智,胡迎春.西部地区矿业发展的现状及对策[J].中国地质大学学报(社会科学版),2003,3(6):7-11.]
[5]Qi Jilin,Cheng Guodong,Vermeer P A.State-of-the-art of influence of freeze-thaw on engineering properties of soils[J].Advance in Earth Science,2005,20(8):887-894.[齐吉琳,程国栋,P A Vermeer.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.]
[6]Feng Decheng,Lin Bo,Zhang Feng,et al.A review of freezethaw effects on soil geotechnical properties[J].Scientia Sinica:Technologica,2017,47(2):111-127.[冯德成,林波,张锋,等.冻融作用对土的工程性质影响的研究进展[J].中国科学:技术科学,2017,47(2):111-127.]
[7]Yong R N,Boonsinsuk P,Yin C W P.Alter nation of soil behavior after cyclic freezing and thawing[C]//Proceedings of4th International Symposium on Ground Freezing.Rotterdam,the Netherlands:A.A.Balkema,1985:187-195.
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[9]Alkire B D,Morrison J M.Change in soil structure due to freeze thaw and repeated loading[J].Transportation Research Record,1983,18(9):15-21.
[10]Bondarenko G I,Sadovsky A V.Water content effect of the thawing clay soils on shear strength[C]//Proceedings of7th International Symposium on Ground Freezing.Rotterdam,Netherlands:AA Balkema.1991:123-127.
[11]Christopher Swan,Christopher Greene.Freeze-thaw effects on Boston blue clay[J].Journal of Engineering and Applied Science,Soil Improvement for Big Digs,1998,81:161-176.
[12]Broms B B,Yao L Y C.Shear strength of a soil after freezing and thawing[J].ASCE Journal of the Soil Mechanics and Foundations Division,1964,90(4):1-26.
[13]Van Klaveren R W.Hydraulic erosion resistance of thawing soil[D].Washington,USA:Department of Agricultural Engineering,Washington State University,1987.
[14]Chuvilin Y M,Yazynin O M.Frozen soil macro and micro structure formation[M].Trondheim:Tapir Publishers,1988:320-323.
[15]Wang Dayan,Ma Wei,Chang Xiaoxiao,et al.Physic-mechanical properties changes of Qinghai-Tibet clay due to cyclic freezing and thawing[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(23):4313-4319.[王大雁,马巍,常小晓,等.冻融循环作用对青藏黏土物理力学性质的影响[J].岩石力学与工程学报,2005,24(23):4313-4319.]
[16]Ni Wankui,Shi Huaqiang.Influence of freezing-thawing cycles on micro-structure and shear strength of loess[J].Journal of Glaciology and Geocryology,2014,36(4):922-927.[倪万魁,师华强.冻融循环作用对黄土微结构和强度的影响[J].冰川冻土,2014,36(4):922-927.]
[17]Yang Ping,Zhang Ting.The physical and the mechanical properties of original and frozen-thawed soil[J].Journal of Glaciology and Geocryology,2002,24(5):665-667.[杨平,张婷.人工冻融土物理力学性能研究[J].冰川冻土,2002,24(5):665-667.]
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[20]Bing Hui,He Ping.Influence of freeze-thaw cycles on physical and mechanical properties of salty soil[J].Chinese Journal of Geotechnical Engineering,2009,31(12):1958-1962.[邴慧,何平.冻融循环对含盐土物理力学性质影响的试验研究[J].岩土工程学报,2009,31(12):1958-1962.]
[21]Zhang Tao,Zhang Guangtian,Li Dongxing.Effects of freezing thawing cycle on strength characteristics of cemented coarse-grained soil[J].Bulletin of Science and Technology,2017,33(6):131-133.[张涛,张广田,李东兴.冻融循环对胶结粗粒土强度特性的影响[J].科技通报,2017,33(6):131-133.]
[22]Zhang Ying,Bing Hui,Yang Chengsong.Influence of freezethaw cycles on mechanical properties of silty clay based on SEM and MIP test[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(Suppl1):3597-3603.[张英,邴慧,杨成松.基于SEM和MIP的冻融循环对粉质黏土强度影响机制研究[J].岩石力学与工程学报,2015,34(增刊1):3597-3603.]
[23]Xu Lei,Liu Sihong,Lu Yang,et al.Physico-mechanical properties of expansive soil under freeze-thaw cycles[J].Rock and Soil Mechanics,2016,37(Suppl2):167-174.[许雷,刘斯宏,鲁洋,等.冻融循环下膨胀土物理力学特性研究[J].岩土力学,2016,37(增刊2):167-174.]
[24]Shihata S A,Baghdadi Z A.Simplified method to assess freeze-thaw durability of soil cement[J].Journal of Materials in Civil Engineering,2001,4(13):243-247.
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