高烈度区浸水高填石路堤变形和稳定性的数值模拟研究
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摘要
填石路堤已经成为山区高等级公路较普遍的路堤形式,但对填石路堤的地震稳定性研究较少。汶川地震以后,我国已处于地震活跃期,因此对西部高烈度山区修建的浸水高填石路堤进行地震作用下的稳定性研究具有十分重要的意义。本文以雅泸高速公路K112+908.16～K113+675段的浸水高填石路堤为研究对象,对在折线地基上填筑的高填石路堤在各种工况下的变形和稳定性情况进行了三维数值仿真。研究结果表明,加强侧向约束,减少侧向变形是保证路堤稳定及在车载作用下不发生开裂的前提;路堤在浸水条件下,由于填石和下覆土体渗透性能良好,计算后发现稳定性未有太大改变,但要注意波浪的淘蚀破坏作用;高填方路堤在Ⅷ度地震作用下将以单纯侧滑方式发生破坏,潜在滑动面为路堤与基底的交界面,只有提高界面强度才能有效提高路堤的抗震性能;提高填石路堤压实度可以有效提高强度,减小变形,但是并非越大越好,应展开压实度与基底承载力之间关系的研究。
Rock-filled embankment has become a general type of road embankment in mountain area.But,there is a lack of the study about its stability in the condition of seismicity.There is a time of seismic vibrancy since Wenchuang earthquake in China.So it is necessary to carry study about highway embankment stability in high seismic region.This paper studies the stability and deformation of high rock-fill embankment which is under the conditions of nature,immersion and seismicity from K112+908.16 to K113+675 along Ya-Lu high way.The findings include the following.Reinforcing the embankment lateral constraints and reducing its lateral deformation are the precondition of a stable embankment and no road tensile openings under traffic loads.In the condition of water immersion,the embankment stability has a little change.But the action of wave scouring should be paid attention.In the condition of VIII degree earthquake intensity,the embankment would be fail by the way of pure aside slide.The slide plane would be the interface between embankment and foundation soil.So it will be effective to improve the ability of resisting seismicity that the strength of interface is enhanced.It is an effective measure to improve the embankment strength and reduce deformation that the degree of compaction is enlarged.But it is not better and better as the degree of compaction becomes bigger.There is a necessary study about the relation between the degree of compaction and bearing capacity of foundation soil.
Rock-filled embankment has become a general type of road embankment in mountain area.But,there is a lack of the study about its stability in the condition of seismicity.There is a time of seismic vibrancy since Wenchuang earthquake in China.So it is necessary to carry study about highway embankment stability in high seismic region.This paper studies the stability and deformation of high rock-fill embankment which is under the conditions of nature,immersion and seismicity from K112+908.16 to K113+675 along Ya-Lu high way.The findings include the following.Reinforcing the embankment lateral constraints and reducing its lateral deformation are the precondition of a stable embankment and no road tensile openings under traffic loads.In the condition of water immersion,the embankment stability has a little change.But the action of wave scouring should be paid attention.In the condition of VIII degree earthquake intensity,the embankment would be fail by the way of pure aside slide.The slide plane would be the interface between embankment and foundation soil.So it will be effective to improve the ability of resisting seismicity that the strength of interface is enhanced.It is an effective measure to improve the embankment strength and reduce deformation that the degree of compaction is enlarged.But it is not better and better as the degree of compaction becomes bigger.There is a necessary study about the relation between the degree of compaction and bearing capacity of foundation soil.
引文
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[2]简阐微,刘少军,毛源等.用平板加载试验评定毛石料回填碾压质量及其在核电站建设中的应用[J].岩土力学,1998,9(3):29～40.Jian Chanwei,Liu Shaojun,Mao Yuan,et al.Estimation of qualityof gravel backfill rolling-compacting with plate-loading tests and itsapplication to construction of nuclear power station.Rock and SoilMechanics,1998,9(3):29～40.
[3]Stephenson R.J.Relative density tests on rock fill at cartersdam.ASTMSTP 523,1973,234～247.
[4]刘萌成,高玉峰,刘汉龙,陈远洪.堆石料变形与强度特性的大型三轴试验研究[J].岩石力学与工程学报,2003,22(7):1102～1111.Liu Mengcheng,Gao Yufeng,Liu Hanlong.Large-scale triaxialtest study on deformation and strength characteristics of rockfill ma-terials.Chinese Journal of Rock Mechanics and Engineering,2003,22(7):1102～1111.
[5]谢婉丽,王家鼎,张林洪.土石粗粒料的强度和变形特性的试验研究[J].岩石力学与工程学报,2005,24(3):430～437.Xie Wanli,Wang Jiading,Zhang Linhong.Testing study on charac-teristics of strength and deformation for coarse materials.ChineseJournal of Rock Mechanics and Engineering,2005,24(3):430～437.
[6]邓卫东.高填路堤稳定性研究[D].长安大学,2003.Deng Weidong.The Study of High Filled Embankment Stability[D].ChangAn University,2003.
[7]宋焕宇.粗粒土斜坡高路堤变形性状与稳定性研究[D].华中科技大学,2007.Song Huanyu.Study on Deformation Characteristics and Stabilityof High Embankment Filled by Coarse Grained Soils on SlopingGround.Huazhong University of Science and Technology,2007.
[8]冯文凯,石豫川,柴贺军等.斜坡填筑路堤变形破坏物理模拟研究[J].岩石力学与工程学报,2006,25(增1):2861～2867.Feng Wenkai1,Shi Yuchuan,Chai Hejun et al.Study on deforma-tion and failure of reclamation road-dike on sloping ground withphysical simulation method.Chinese Journal of Rock Mechanicsand Engineering,2006,25(s1):2861～2867.
[9]高永涛,张怀静,孙金海,等.高填方路基单纯侧滑失稳治理的理论研究及工程应用[J],公路交通科技,2004,21(9):9～12.Gao Yongtao,Zhang Huaijing,Sun Jinhai,et al.Theoretical studyon treatment of side slope in high filled road subgrade and its ap-plication in engineering.Journal of Highway and TransportationResearch and Development,2004,21(9):9～12.
[10]刘红帅,薄景山,刘德东.岩土边坡地震稳定性分析研究评述[J].地震工程与工程振动,2005,25(1):164～171.Liu Hongshuai,Bo Jingshan,Liu Dedong.Reviewon study of seis-mic stability analysis of rock-soil slopes.Earthquake Engineeringand Engineering Vibration,2005,25(1):164～171.
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