高海拔多年冻土区露天煤矿软弱夹层冻融损伤试验研究
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摘要
为了建立多年冻土区露天煤矿软弱夹层强度与冻融循环的关系,获取相互之间的变化规律,借助三轴压缩试验对木里露天煤矿软弱夹层在增湿与冻融两条件下的冻融损伤进行了试验研究。结果表明:软弱夹层强度参数黏聚力、内摩擦角及弹性模量随含水率增加均降低且呈幂函数关系,泊松比与含水率呈类线性关系;强度参数随冻融循环次数增加总体仍呈明显下降趋势且呈指数函数关系。随着冻融次数和含水率的增加,软弱夹层的冻融损伤与耦合损伤因子均呈非线性递增趋势,冻融损伤在耦合损伤过程中起主导作用,尤其是当含水率达到13.87%之后,冻融损伤的主导作用愈加明显。
In order to establish the relationship between the strength of weak interlayer and the freezethaw cycle in opencast coal mine in the permafrost area,and obtain the variation law between the strength and the freeze-thaw cycle,the paper studies the freeze-thaw damage of weak interlayer in Muli opencast coal mine under humidification and freeze-thaw conditions by means of triaxial compression test.The experimental results show that the cohesion,internal friction angle and elastic modulus of weak interlayer decrease with the increase in moisture content,and the Poisson's ratio is linear with the increasing moisture content.With the freeze-thaw cycle times increasing,the strength parameters still show an obvious downward trend and an exponential function relationship.With the freeze-thaw times and moisture content increasing,the freeze-thaw damage and coupling damage factors of weak interlayer show a nonlinearly increasing trend,and freeze-thaw damage plays a leading role in the process of coupling damage.Especially when the moisture content reaches 13.87%,the dominant effect of freezethaw damage is becoming more obvious.
In order to establish the relationship between the strength of weak interlayer and the freezethaw cycle in opencast coal mine in the permafrost area,and obtain the variation law between the strength and the freeze-thaw cycle,the paper studies the freeze-thaw damage of weak interlayer in Muli opencast coal mine under humidification and freeze-thaw conditions by means of triaxial compression test.The experimental results show that the cohesion,internal friction angle and elastic modulus of weak interlayer decrease with the increase in moisture content,and the Poisson's ratio is linear with the increasing moisture content.With the freeze-thaw cycle times increasing,the strength parameters still show an obvious downward trend and an exponential function relationship.With the freeze-thaw times and moisture content increasing,the freeze-thaw damage and coupling damage factors of weak interlayer show a nonlinearly increasing trend,and freeze-thaw damage plays a leading role in the process of coupling damage.Especially when the moisture content reaches 13.87%,the dominant effect of freezethaw damage is becoming more obvious.
引文
[1]徐拴海,张宏刚,张卫东.青藏高原多年冻土区露天煤矿砂岩冻融损伤机制研究[R].西安:中煤科工集团西安研究院有限公司,2018.XU Shuanhai,ZHANG Honggang,ZHANG Weidong.Research on Frost-Thaw Damage Mechanism of Open Pit Coal Mine in Permafrost Soil Area of Qinghai-Tibet Plateau[R].Xi’an:Xi’an Research Institute of China Coal Industry Group,2018.(in Chinese)
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[6]马巍,徐学祖,张立新.冻融循环对石灰粉土剪切强度特性的影响[J].岩土工程学报,1999,21(2):158.MA Wei,XU Xuezu,ZHANG Lixin.Influence of Frost and Thaw Cycles on Shear Strength of Lime Silt[J].Chinese Journal of Geotechnical Engineering,1999,21(2):158.(in Chinese)
[7]杨成松,何平,程国栋,等.冻融作用对土体干容重和含水量影响的试验研究[J].岩石力学与工程学报,2003,22(S2):2695.YANG Chengsong,HE Ping,CHENG Guodong,et al.Testing Study on Influence of Freezing and Thawing on Dry Density and Water Content of Soil[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(S2):2695.(in Chinese)
[8]韩铁林,陈蕴生,师俊平,等.冻融循环下钙质砂岩力学特性及其损伤劣化机制的试验研究[J].岩土工程学报,2016,38(10):1802.HAN Tielin,CHEN Yunsheng,SHI Junping,et al.Experimental Study on Mechanical Properties and Damage Degradation Mechanism of Calcareous Sandstone Subjected to Freeze-Thaw Cycles[J].Chinese Journal of Geotechnical Engineering,2016,38(10):1802.(in Chinese)
[9]KONRAD J M.Physical Processes During FreezeThaw Cycles in Clayey Silts[J].Cold Regions Science and Technology,1989,16(3):291.
[10]YONG R N,BOONSINSUK P.Alteration of Soil Behavior after Cyclic Freezing and Thawing[C]//Proceeding of Fourth International Symposium on Ground Freezing.Sapporo:A A Balkema Publishers,1985:187.
[11]田威,谢永利,党发宁.冻融环境下混凝土力学性能试验及损伤演化[J].四川大学学报(工程科学版),2015,47(4):38.TIAN Wei,XIE Yongli,DANG Faning.Experimental Study on the Mechanical Property and Damage Evolution of Concrete under Freeze-Thaw Environment[J].Journal of Sichuan University(Engineering Science Edition),2015,47(4):38.(in Chinese)
[12]霍明,汪双杰,章金钊,等.含水率和温度对高含冰量冻土力学性质的影响[J].水利学报,2010,41(10):1165.HUO Ming,WANG Shuangjie,ZHANG Jinzhao,et al.Experimental Study on Influences of Water Content and Temperature on Mechanical Properties of IceRich Frozen Soil[J].Journal of Hydraulic Engineering,2010,41(10):1165.(in Chinese)
[13]RABOTNOV Y N.On the Equations of State for Creep[C]//Progress in Applied Mechanics.New York:Macmillan,1963:307.
[14]RABOTNOV Y N.Creep Ruptures[C]//Proceedings of the 12th International Congress of Applied Mechanics.Berlin:Springer-Verlag,1968:342.
[15]LEMAITRE J.A Continuous Damage Mechanics Model for Ductile Fracture[J].Journal of Engineering Materials and Technology,1985,107(1):83.
[2]徐拴海,李宁,王晓东,等.露天煤矿冻岩边坡饱和砂岩冻融损伤试验与劣化模型研究[J].岩石力学与工程学报,2016,35(12):2561.XU Shuanhai,LI Ning,WANG Xiaodong,et al.Damage Test and Degradation Model of Saturated Sandstone Due to Cyclic Freezing and Thawing of Rock Slopes of Open-Pit Coal Mine[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(12):2561.(in Chinese)
[3]唐良琴,聂德新,刘东燕,等.软弱夹层强度参数的主要影响因素分析[J].工程地质学报,2012,20(2):289.TANG Liangqin,NIE Dexin,LIU Dongyan,et al.A-nalysis of Main Factors Influencing Strength Parameters of Soft Intercalation[J].Journal of Engineering Geology,2012,20(2):289.(in Chinese)
[4]项伟.软弱夹层微结构研究及其力学意义[J].地球科学-武汉地质学院学报,1985,10(1):165.XIANG Wei.The Study of Microstructures of Weak Intercalations and Their Mechanical Significance[J].Earth Science-Journal of Wuhan College of Geology,1985,10(1):165.(in Chinese)
[5]符文熹,聂德新,尚岳全,等.地应力作用下软弱层带的工程特性研究[J].岩土工程学报,2002,24(5):584.FU Wenxi,NIE Dexin,SHANG Yuequan,et al.Study on Engineering Properties of Weak Layers under Ground Stresses[J].Chinese Journal of Geotechnical Engineering,2002,24(5):584.(in Chinese)
[6]马巍,徐学祖,张立新.冻融循环对石灰粉土剪切强度特性的影响[J].岩土工程学报,1999,21(2):158.MA Wei,XU Xuezu,ZHANG Lixin.Influence of Frost and Thaw Cycles on Shear Strength of Lime Silt[J].Chinese Journal of Geotechnical Engineering,1999,21(2):158.(in Chinese)
[7]杨成松,何平,程国栋,等.冻融作用对土体干容重和含水量影响的试验研究[J].岩石力学与工程学报,2003,22(S2):2695.YANG Chengsong,HE Ping,CHENG Guodong,et al.Testing Study on Influence of Freezing and Thawing on Dry Density and Water Content of Soil[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(S2):2695.(in Chinese)
[8]韩铁林,陈蕴生,师俊平,等.冻融循环下钙质砂岩力学特性及其损伤劣化机制的试验研究[J].岩土工程学报,2016,38(10):1802.HAN Tielin,CHEN Yunsheng,SHI Junping,et al.Experimental Study on Mechanical Properties and Damage Degradation Mechanism of Calcareous Sandstone Subjected to Freeze-Thaw Cycles[J].Chinese Journal of Geotechnical Engineering,2016,38(10):1802.(in Chinese)
[9]KONRAD J M.Physical Processes During FreezeThaw Cycles in Clayey Silts[J].Cold Regions Science and Technology,1989,16(3):291.
[10]YONG R N,BOONSINSUK P.Alteration of Soil Behavior after Cyclic Freezing and Thawing[C]//Proceeding of Fourth International Symposium on Ground Freezing.Sapporo:A A Balkema Publishers,1985:187.
[11]田威,谢永利,党发宁.冻融环境下混凝土力学性能试验及损伤演化[J].四川大学学报(工程科学版),2015,47(4):38.TIAN Wei,XIE Yongli,DANG Faning.Experimental Study on the Mechanical Property and Damage Evolution of Concrete under Freeze-Thaw Environment[J].Journal of Sichuan University(Engineering Science Edition),2015,47(4):38.(in Chinese)
[12]霍明,汪双杰,章金钊,等.含水率和温度对高含冰量冻土力学性质的影响[J].水利学报,2010,41(10):1165.HUO Ming,WANG Shuangjie,ZHANG Jinzhao,et al.Experimental Study on Influences of Water Content and Temperature on Mechanical Properties of IceRich Frozen Soil[J].Journal of Hydraulic Engineering,2010,41(10):1165.(in Chinese)
[13]RABOTNOV Y N.On the Equations of State for Creep[C]//Progress in Applied Mechanics.New York:Macmillan,1963:307.
[14]RABOTNOV Y N.Creep Ruptures[C]//Proceedings of the 12th International Congress of Applied Mechanics.Berlin:Springer-Verlag,1968:342.
[15]LEMAITRE J.A Continuous Damage Mechanics Model for Ductile Fracture[J].Journal of Engineering Materials and Technology,1985,107(1):83.
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