地铁行车荷载作用下粉质黏土累积塑性应变特性
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摘要
目的研究地铁行车荷载作用下隧道周围土体变形特性,为城市地下轨道交通工程设计、施工及运营期间的安全稳定评价提供参考.方法通过室内动三轴试验,探索地铁行车荷载作用下粉质黏土累积塑性应变发展规律,在此基础上,利用数理统计知识计算各因素及因素之间的耦合作用对累积塑性应变的影响率.结果在相同试验条件下,累积塑性应变随围压增大而减小,随固结比增大而减小,随动应力幅值增大而增大,随频率增大而减小,随振动次数增大而增大.结论单因素中动应力幅值对累积塑性应变的影响最大,其次是围压和频率,最后是振动次数;围压与振动次数、频率与振动次数之间的耦合作用对累积塑性应变的影响可忽略不计;因素之间的耦合作用在一定条件下比单因素对累积塑性应变的影响效果要显著.
In order to provide reference for the safety and stability evaluation during the design,construction and operation of underground railway traffic engineering,the deformation characteristics of the silty clay under subway moving loads are studied. Through the dynamic triaxial tests,this paper explores the development of accumulated plastic strain of silty clay under subway moving loads and uses mathematical statistics to calculate the influence of accumulated plastic strain between factors and their couplings. The results showthat accumulated plastic strain increases with less pore pressure,less consolidation ratio,lager amplitude of dynamic stress,less frequency and lager vibration times under the same experimental conditions. The greatest influence on accumulated plastic strain is dynamic stress,the second is pore pressure and frequency,the last is vibrationtimes. The interaction function to accumulated plastic strain of frequency and vibration times,pore pressure and vibration times can be ignored. The interaction function is remarkable to accumulated plastic strain than single factor under certain conditions.
In order to provide reference for the safety and stability evaluation during the design,construction and operation of underground railway traffic engineering,the deformation characteristics of the silty clay under subway moving loads are studied. Through the dynamic triaxial tests,this paper explores the development of accumulated plastic strain of silty clay under subway moving loads and uses mathematical statistics to calculate the influence of accumulated plastic strain between factors and their couplings. The results showthat accumulated plastic strain increases with less pore pressure,less consolidation ratio,lager amplitude of dynamic stress,less frequency and lager vibration times under the same experimental conditions. The greatest influence on accumulated plastic strain is dynamic stress,the second is pore pressure and frequency,the last is vibrationtimes. The interaction function to accumulated plastic strain of frequency and vibration times,pore pressure and vibration times can be ignored. The interaction function is remarkable to accumulated plastic strain than single factor under certain conditions.
引文
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[12]唐益群.地铁行车荷载作用下淤泥质黏土累积特性的试验研究[J].工程地质学报,2010,19(4):460-466.(TANGYiqun. Experimental study on the behavior of muddy clay under subway loading[J]. Journal of engineering geology,2010,19(4):460-466.)
[13]黄博.高速列车荷载作用的动三轴试验模拟[J].岩土工程学报,2011,33(2):195-202.(HUANGBo. Simulation of high-speed train load by dynamic triaxial tests[J]. Chinese journal of geotechnical engineering,2011,33(2):195-202.)
[14]张柯.地铁行车荷载作用下黄土地层的振动响应和沉降[D].西安:西安建筑科技大学,2011.(ZHANGKe. Vibration and settlement of loess due to subway moving loads[D]. Xi'an:Xi'an University of Architecture&Technology,2011.)
[15]来淑娜.地铁荷载下杭州饱和粉砂土动力特性试验研究[D].杭州:浙江工业大学,2013.(LAI Shuna. Research on dynamic properties of Hangzhou's saturated silty sands under metro vibration loading[D]. Hangzhou:Zhejiang University of Technology,2011.)
[16]王婷婷.地铁动荷载作用下软土的动力特性与长期沉降研究[D].南京:东南大学,2014.(WANGTingting. Study on the dynamic characteristics of soft soil and the long-term settlement induced by the dynamic load[D]. Nanjing:Southeast University,2014.)
[17]张涛.地铁列车荷载下不同固结度重塑粘土动力特性试验研究[D].杭州:浙江大学,2014.(ZHANGTao. Experimental study on dynamic characteristics of remolded clay with different consolidation degree under subway loading[D]. Hangzhou:Zhejiang University,2014.)
[18]闫春岭,唐益群,刘莎.地铁荷载下饱和软黏土累积变形特性[J].同济大学学报(自然科学版),2011,39(7):978-982.(YAN Chunling,TANGYiqun,LIU Sha. Accumulative deformation characteristic of saturated soft clay under subway loading in Shanghai[J]. Journal of tongji university(natural science),2011,39(7):978-982.)
[2] HECKL M,HAUK G,WETTSCHURECK R.Structure-borne sound and vibration from rail traffic[J]. Journal of sound and vibration,1996,193(1):175-184.
[3] HILDEBRAND R. Countermeasures against railway ground and track vibrations[D]. Stockholm:Royal Institute of Technology,2001.
[4] HUSSEIN MF M,HUNT H E M. A power flowmethod for evaluating vibration from underground railways[J]. Journal of sound and vibration,2006,293(3-5):667-679.
[5] GUPTA S,HUSSEIN MF M,DEGRANDE G,et al. A comparison of two numerical models for the prediction of vibrations from underground railway traffic[J]. Soil dynamics and earthquake engineering,2007,27(7):608-624.
[6] CLOUTEAU D,ARNST M,AL-HUSSAINI T M,et al. Freefield vibration due to dynamic loading on a tunnel embedded in a stratified medium[J]. Journal of sound and vibration,2005,283(1-2):173-199.
[7] YANGY B,HUANGH,CHANGD W. Traininduced wave propagation in layered soils using finite/infinite element simulation[J]. Soils dynamics and earthquake engineering,2003,23(4):263-278.
[8] GUPTA S,LIU W F,DEGRANDE G,et al.Prediction of vibrations induced by underground railway traffic in Beijing[J]. Journal of sound and vibration,2008,310(3):608-630.
[9] YILMAZ MT,PEKCAN O,BAKIR B S,et al.Undrained cyclic shear and deformation behavior of silt-clay mixtures of Adapazari,Turkey[J]. Soil dynamics and earthquake engineering,2004,24(7):497-507.
[10] CHAI J C,MIURA N. Traffic-load-induced permanent deformation of road on soft subsoil[J].Journal of geotechnical and geoenvironmental engineering,2002,128(11):907-916.
[11]赵书凯.地铁行车荷载下软黏土微观结构变形破坏机制研究[D].上海:同济大学,2006.(ZHAO Shukai. The study on the micro-structure distortion mechanics of soft clay under the subway-included loading[D]. Shanghai:Tongji University,2006.)
[12]唐益群.地铁行车荷载作用下淤泥质黏土累积特性的试验研究[J].工程地质学报,2010,19(4):460-466.(TANGYiqun. Experimental study on the behavior of muddy clay under subway loading[J]. Journal of engineering geology,2010,19(4):460-466.)
[13]黄博.高速列车荷载作用的动三轴试验模拟[J].岩土工程学报,2011,33(2):195-202.(HUANGBo. Simulation of high-speed train load by dynamic triaxial tests[J]. Chinese journal of geotechnical engineering,2011,33(2):195-202.)
[14]张柯.地铁行车荷载作用下黄土地层的振动响应和沉降[D].西安:西安建筑科技大学,2011.(ZHANGKe. Vibration and settlement of loess due to subway moving loads[D]. Xi'an:Xi'an University of Architecture&Technology,2011.)
[15]来淑娜.地铁荷载下杭州饱和粉砂土动力特性试验研究[D].杭州:浙江工业大学,2013.(LAI Shuna. Research on dynamic properties of Hangzhou's saturated silty sands under metro vibration loading[D]. Hangzhou:Zhejiang University of Technology,2011.)
[16]王婷婷.地铁动荷载作用下软土的动力特性与长期沉降研究[D].南京:东南大学,2014.(WANGTingting. Study on the dynamic characteristics of soft soil and the long-term settlement induced by the dynamic load[D]. Nanjing:Southeast University,2014.)
[17]张涛.地铁列车荷载下不同固结度重塑粘土动力特性试验研究[D].杭州:浙江大学,2014.(ZHANGTao. Experimental study on dynamic characteristics of remolded clay with different consolidation degree under subway loading[D]. Hangzhou:Zhejiang University,2014.)
[18]闫春岭,唐益群,刘莎.地铁荷载下饱和软黏土累积变形特性[J].同济大学学报(自然科学版),2011,39(7):978-982.(YAN Chunling,TANGYiqun,LIU Sha. Accumulative deformation characteristic of saturated soft clay under subway loading in Shanghai[J]. Journal of tongji university(natural science),2011,39(7):978-982.)