交通荷载作用下冻土路基动力响应分析
|
摘要
季节冻土区路基在交通荷载作用下的冻胀翻浆病害是一个复杂的热、力相互作用过程,又是一个急需解决的实际工程难题.运用传热学及Biot固结理论建立季节冻土区公路路基的动力分析模型,以季节冻土区典型冻胀翻浆路基为例,分析其工程处理前、后的动力反应特性.结果表明:1)路基温度场的研究表明修筑路基后,在路基及其下部地基中将会产生大片的力学性质极不稳定的高温冻土层;2)路基运营期当交通荷载刚驶入或离开路基计算断面时,路基内的加速度、速度、位移、应力、孔隙水压力均振荡剧烈.但与普通路基相比,防冻胀翻浆路基的碎石层大大削弱了汽车动荷载的冲击振动作用;3)防冻胀翻浆路基中间存在透水层(碎石),减小了路基内的孔隙水压力,与普通路基相比,防冻胀翻浆路基的最大孔隙水压力比减小达30%左右,这对延缓、消除路基病害产生有很大作用.计算理论以及分析结果可为季节冻土区道路的安全运营以及维修提供参考依据.
Frost heave and frost boiling is a complicated interaction course between heat and force on embankment under traffic loading in seasonally frozen ground regions,and is also an engineering problem which is badly in need of solving.Heat transfer theory and Biot consolidation theory are applied to develop dynamic analysis model for embankment in seasonally frozen ground regions.Taking a typical embankment as an example,the characteristics of the dynamic response were calculated and analyzed for an embankment before and after engineering handling.The research conclusions indicate:1)A block of high temperature frozen ground takes place inside the embankment,where ground mechanical property becomes unstable;2)In the operation life cycle,when traffic load drive into or depart from the calculating cross-section,acceleration,velocity,displacement,stress and pore water pressure inside the embankment vibrate severely.However,comparing with ordinary embankment,the vibration and shock due to motor vehicle dynamic load are greatly weakened by the macadam inside the embankment of preventing frost heaving pumping;3)Pore water pressure inside the embankment of preventing frost heaving pumping decreases,as compared with ordinary embankment,with a maximum reducing extent of 31.4%.Thus,it greatly brings about delaying or eliminating embankment disease.The conclusions are useful for disease controlling and theoretical research.
Frost heave and frost boiling is a complicated interaction course between heat and force on embankment under traffic loading in seasonally frozen ground regions,and is also an engineering problem which is badly in need of solving.Heat transfer theory and Biot consolidation theory are applied to develop dynamic analysis model for embankment in seasonally frozen ground regions.Taking a typical embankment as an example,the characteristics of the dynamic response were calculated and analyzed for an embankment before and after engineering handling.The research conclusions indicate:1)A block of high temperature frozen ground takes place inside the embankment,where ground mechanical property becomes unstable;2)In the operation life cycle,when traffic load drive into or depart from the calculating cross-section,acceleration,velocity,displacement,stress and pore water pressure inside the embankment vibrate severely.However,comparing with ordinary embankment,the vibration and shock due to motor vehicle dynamic load are greatly weakened by the macadam inside the embankment of preventing frost heaving pumping;3)Pore water pressure inside the embankment of preventing frost heaving pumping decreases,as compared with ordinary embankment,with a maximum reducing extent of 31.4%.Thus,it greatly brings about delaying or eliminating embankment disease.The conclusions are useful for disease controlling and theoretical research.
引文
[1]Liu Yiping.The Research on Frost Heaving Characteristics ofRoadbed at Xiangpi Mountain Section in No.109th NationalHighway[D].Master's Degree Thesis,Beijing:Beijing Jiao-tong University,2009.[刘宜平.109国道橡皮山段砂质粉土冻胀特性试验研究[D].北京:北京交通大学硕士学位论文,2009.]
[2]Dong Xiaohong,Zhang Aijun,Lian Jiangbo,et al.Study ofshear strength deterioration of loess under repeated freezing-thawing cycles[J].Journal of Glaciology and Geocryology,2010,32(4):767-772.[董晓宏,张爱军,连江波,等.反复冻融下黄土抗剪强度劣化的试验研究[J].冰川冻土,2010,32(4):767-772.]
[3]Wu Qingbai,Cui Wei,Liu Yongzhi.The cooling effect of U-type crushed rock embankment on permafrost[J].Journal ofGlaciology and Geocryology,2010,32(3):532-537.[吴青柏,崔巍,刘永智.U型块石路基结构对多年冻土的降温作用[J].冰川冻土,2010,32(3):532-537.]
[4]Qiu Wenge.Study of the experiment method for triaxial frostheaving constitutive relations of frozen soil[J].Journal ofGlaciology and Geocryology,2010,32(1):116-120.[仇文革,孙兵.冻土三轴冻胀应力-应变试验方法研究[J].冰川冻土,2010,32(1):116-120.]
[5]Tian Huaizhi,Wang Dayan,Ma Wei,et al.Study of the me-chanical properties of frozen deep-buried clay under high pres-sures in unloaded state[J].Journal of Glaciology and Geocry-ology,2010,32(2):351-357.[田怀植,王大雁,马巍等.高压力作用下深部粘土冻结后卸载应力路径的力学性质研究[J].冰川冻土,2010,32(2):351-357.]
[6]Li Qingze,Lai Yuanming,Xu Xiangtian,et al.Triaxialstrength distribution of warm frozen soil and its damage statis-tical constitutive model[J].Journal of Glaciology and Geocry-ology,2010,32(6):1234-1241.[李清泽,赖远明,徐湘田,等.高温冻土三轴强度分布及损伤统计本构模型[J].冰川冻土,2010,32(6):1234-1241.]
[7]Song Cunniu.A review on the theory and models about cou-pled heat-moisture-stress interaction during soil freezing andthawing[J].Journal of Glaciology and Geocryology,2010,32(5):982-988.[宋存牛.冻融过程中土体水热力耦合作用理论和模型研究进展[J].冰川冻土,2010,32(5):982-988.]
[8]Tayor G S,Luthin J N.A model for coupled heat and mois-ture transfer during soil freezing[J].Canadian GeotechnicalJournal,1978,15:548-555.
[9]Sheppard M T,Kay B D,Loch J P G.Development and tes-ting of a computer model for heat and mass flow in freezingsoils[C]//Proceedings of 3rd International Conference on Per-mafrost,National Research Council of Canada,Ottawa,Ont.,1978:76-81.
[10]Kay B D,Groenevelt P H.On the interaction of water and heattransport in frozen and unfrozen soil[J].Soil science Society ofAmerica,1974,38:395-400.
[11]An Weidong.Temperature Water Stress and Their Interactionsof Permafrost[M].Lanzhou:Lanzhou University Press,1990.[安维东.冻土的温度水分应力及其相互作用[M].兰州:兰州大学出版社,1990.]
[12]Li Shuangyang.Numerical Study on the Thermal–Mechani-cal Stability of Railway Subgrade in Permafrost Regions[D].Dissertation for Ph.D,Lanzhou:Graduate University of theChinese Academy of Sciences,2008.[李双洋.多年冻土区铁路路基热-力稳定性数值仿真研究[D].兰州:中国科学院研究生院博士学位论文,2008.]
[13]Li Shuangyang,Zhang Shujuan,Zhao Dean et al.Dynamical a-nalysis model for frozen embankment and seismic hazard as-sessment of Qinghai-Tibet Railway[J].Rock and Soil Me-chanics,2010,31(7):2179-2187.[李双洋,张淑娟,赵德安,等.冻土路基动力分析模型及青藏铁路地震灾害评估[J].岩土力学,2010,31(7):2179-2187.]
[14]Li Shuangyang,Zhang Mingyi,Zhang Shujuan et al.Analysisof the dynamic response of Qinghai-Tibetan Railway embank-ment in permafrost regions under train load[J].Journal ofGlaciology and Geocryology,2008,30(5):860-866.[李双洋,张明义,张淑娟,等.列车荷载下青藏铁路冻土路基动力响应分析[J].冰川冻土,2008,30(5):860-866.]
[15]Gu Xianming.Study on Mechanism and Prevention of FrostHeaving and Frost Boiling in Seasonally Frozen Road[D].Ph.D.Thesis,Changchun:Jilin University,2007.[谷宪明.季冻区道路冻胀翻浆机理及防治研究[D].长春:吉林大学博士学位论文,2007.]
[2]Dong Xiaohong,Zhang Aijun,Lian Jiangbo,et al.Study ofshear strength deterioration of loess under repeated freezing-thawing cycles[J].Journal of Glaciology and Geocryology,2010,32(4):767-772.[董晓宏,张爱军,连江波,等.反复冻融下黄土抗剪强度劣化的试验研究[J].冰川冻土,2010,32(4):767-772.]
[3]Wu Qingbai,Cui Wei,Liu Yongzhi.The cooling effect of U-type crushed rock embankment on permafrost[J].Journal ofGlaciology and Geocryology,2010,32(3):532-537.[吴青柏,崔巍,刘永智.U型块石路基结构对多年冻土的降温作用[J].冰川冻土,2010,32(3):532-537.]
[4]Qiu Wenge.Study of the experiment method for triaxial frostheaving constitutive relations of frozen soil[J].Journal ofGlaciology and Geocryology,2010,32(1):116-120.[仇文革,孙兵.冻土三轴冻胀应力-应变试验方法研究[J].冰川冻土,2010,32(1):116-120.]
[5]Tian Huaizhi,Wang Dayan,Ma Wei,et al.Study of the me-chanical properties of frozen deep-buried clay under high pres-sures in unloaded state[J].Journal of Glaciology and Geocry-ology,2010,32(2):351-357.[田怀植,王大雁,马巍等.高压力作用下深部粘土冻结后卸载应力路径的力学性质研究[J].冰川冻土,2010,32(2):351-357.]
[6]Li Qingze,Lai Yuanming,Xu Xiangtian,et al.Triaxialstrength distribution of warm frozen soil and its damage statis-tical constitutive model[J].Journal of Glaciology and Geocry-ology,2010,32(6):1234-1241.[李清泽,赖远明,徐湘田,等.高温冻土三轴强度分布及损伤统计本构模型[J].冰川冻土,2010,32(6):1234-1241.]
[7]Song Cunniu.A review on the theory and models about cou-pled heat-moisture-stress interaction during soil freezing andthawing[J].Journal of Glaciology and Geocryology,2010,32(5):982-988.[宋存牛.冻融过程中土体水热力耦合作用理论和模型研究进展[J].冰川冻土,2010,32(5):982-988.]
[8]Tayor G S,Luthin J N.A model for coupled heat and mois-ture transfer during soil freezing[J].Canadian GeotechnicalJournal,1978,15:548-555.
[9]Sheppard M T,Kay B D,Loch J P G.Development and tes-ting of a computer model for heat and mass flow in freezingsoils[C]//Proceedings of 3rd International Conference on Per-mafrost,National Research Council of Canada,Ottawa,Ont.,1978:76-81.
[10]Kay B D,Groenevelt P H.On the interaction of water and heattransport in frozen and unfrozen soil[J].Soil science Society ofAmerica,1974,38:395-400.
[11]An Weidong.Temperature Water Stress and Their Interactionsof Permafrost[M].Lanzhou:Lanzhou University Press,1990.[安维东.冻土的温度水分应力及其相互作用[M].兰州:兰州大学出版社,1990.]
[12]Li Shuangyang.Numerical Study on the Thermal–Mechani-cal Stability of Railway Subgrade in Permafrost Regions[D].Dissertation for Ph.D,Lanzhou:Graduate University of theChinese Academy of Sciences,2008.[李双洋.多年冻土区铁路路基热-力稳定性数值仿真研究[D].兰州:中国科学院研究生院博士学位论文,2008.]
[13]Li Shuangyang,Zhang Shujuan,Zhao Dean et al.Dynamical a-nalysis model for frozen embankment and seismic hazard as-sessment of Qinghai-Tibet Railway[J].Rock and Soil Me-chanics,2010,31(7):2179-2187.[李双洋,张淑娟,赵德安,等.冻土路基动力分析模型及青藏铁路地震灾害评估[J].岩土力学,2010,31(7):2179-2187.]
[14]Li Shuangyang,Zhang Mingyi,Zhang Shujuan et al.Analysisof the dynamic response of Qinghai-Tibetan Railway embank-ment in permafrost regions under train load[J].Journal ofGlaciology and Geocryology,2008,30(5):860-866.[李双洋,张明义,张淑娟,等.列车荷载下青藏铁路冻土路基动力响应分析[J].冰川冻土,2008,30(5):860-866.]
[15]Gu Xianming.Study on Mechanism and Prevention of FrostHeaving and Frost Boiling in Seasonally Frozen Road[D].Ph.D.Thesis,Changchun:Jilin University,2007.[谷宪明.季冻区道路冻胀翻浆机理及防治研究[D].长春:吉林大学博士学位论文,2007.]
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心