武广高铁无碴轨道路堑基床长期动力稳定性评价
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摘要
基于室内疲劳动力试验所获得的临界动应力、疲劳动剪应变门槛及现场动响应测试成果,采用临界动应力法和动剪应变法,评价武广(武汉—广州)高速铁路无碴轨道红黏土路堑基床的长期动力稳定性,给出同时满足动强度和动变形条件的最小基床换填厚度理论值。综合考虑铁路路基构造要求、实测路基动响应影响深度、红黏土特殊工程性质、安全储备等因素,给出便于工程应用的红黏土基床最小换填厚度建议值,探讨含水比、围压对红黏土基床换填厚度的影响规律。研究结果表明:换填厚度随含水比的增大而增大,随围压的增大而减小;若路基满足动变形条件,则动强度条件就自动满足;动变形是高铁无碴轨道路基长期动力稳定的控制因素;动剪应变法是一种优于临界动应力法的高铁无碴轨道路基长期动力稳定性评价方法。
Based on field dynamic response testing results and the critical dynamic stress and fatigue dynamic shear strain threshold obtained from fatigue test indoor,the long-term dynamic stability of red clay cutting bed under ballastless track of Wuhan-Guangzhou high-speed railway was preliminary evaluated by methods of critical dynamic stress and dynamic shear strain respectively,and the theory values of minimal replacement thickness to meet synchronously two requirements of dynamic strength and dynamic deformation were given.After considering railway bed structure request,actual cutting bed dynamic response influencing depth,special engineering properties of red clay and safety storage and so on,the suggestion values applied conveniently in engineering were also given.Influences for water content ratio and confining pressure on replacement thickness of cutting bed were discussed.The results show that the dynamic shear strain threshold increases with the increase of water ratio and reduces with the increase of confining pressures.Dynamic strength condition of roadbed can be certainly satisfied if the dynamic deformation condition can be done;dynamic deformation is the controlling factor of ballastless track roadbed of high-speed railway.The method of dynamic shear strain is superior to the way of critical dynamic stress.
Based on field dynamic response testing results and the critical dynamic stress and fatigue dynamic shear strain threshold obtained from fatigue test indoor,the long-term dynamic stability of red clay cutting bed under ballastless track of Wuhan-Guangzhou high-speed railway was preliminary evaluated by methods of critical dynamic stress and dynamic shear strain respectively,and the theory values of minimal replacement thickness to meet synchronously two requirements of dynamic strength and dynamic deformation were given.After considering railway bed structure request,actual cutting bed dynamic response influencing depth,special engineering properties of red clay and safety storage and so on,the suggestion values applied conveniently in engineering were also given.Influences for water content ratio and confining pressure on replacement thickness of cutting bed were discussed.The results show that the dynamic shear strain threshold increases with the increase of water ratio and reduces with the increase of confining pressures.Dynamic strength condition of roadbed can be certainly satisfied if the dynamic deformation condition can be done;dynamic deformation is the controlling factor of ballastless track roadbed of high-speed railway.The method of dynamic shear strain is superior to the way of critical dynamic stress.
引文
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[11]杨果林,刘晓红.高速铁路无砟轨道红黏土路基沉降控制与动力稳定性[M].北京:中国铁道出版社,2010:245-288.YANG Guo-lin,LIU Xiao-hong.Red clay subgrade settlementcontrol and dynamic stability analysis of ballastless track of highspeed railway[M].Beijing:China Railway Publishing House,2010:245-288.
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[15]DS 836—1997.Vorschrift für erdbau werke[S].DS 836—1997.Guide for subgrade engineering of railway[S].
[2]蔡英,曹新文.重复加载下路基填土的临界动应力和永久性应变初探[J].西南交通大学学报,1996,31(1):1-5.CAI Ying,CAO Xin-wen.Study of the critical dynamic stressand permanent strain of the subgrade-soil under repeated load[J].Journal of Southwest Jiao-tong University,1996,31(1):1-5.
[3]TB 1001—2005.铁路路基设计规范[S].TB 1001—2005.Code for design on subgrade of railway[S].
[4]TB 10625—2009.高速铁路设计规范(试行)[S].TB 10625—2009.Code for design on subgrade of high speedrailway[S].
[5]836—2000.Richtlinie für erdbauwerke planen,bauen undinstand halten[S].836—2000.Guide for railway roadbed design,construction andmaintenance[S].
[6]张克绪,谢君斐.土动力学[M].北京:中国地震出版社,1989:43-57.ZHANG Ke-xu,XIE Jun-fei.Soil dynamics[M].Beijing:ChinaSeismological Press,1989:43-57.
[7]Hu Y F,Gartung E,Prühs H,et al.Bewertung der dynamischenstabilit-t von erdbauwerken unter eisenbahnverkehr[J].Geotechnik,2003,26(1):42-56.Hu Y F,Gartung E,Prühs H,et al.Evaluation on dynamicstability of railway subgrade under traffic loading[J].Geotechnical Engineering,2003,26(1):42-56.
[8]Hu Y F,Haupt W,Müllner B.ResCol-Versuche zur prüfung derdynamischen langzeitstabilit-t von TA/TM-B-den untereistenbahnverkehr[J].Bautechnik,2004,81(4):295-306.Hu Y F,Haupt W,Müllner B.Laboratory and field tests oflong-term dynamic stability of TA/TM-soil subgrade underrailway traffic loading[J].Construction Technology,2004,81(4):295-306.
[9]胡一峰.高速铁路路基长期动力稳定性分析的理论和实践(SCR-SG021)[R].慕尼黑:欧博迈亚公司,2008:10-30.HU Yi-feng.Long-term dynamic stability of subgrade under highspeed railway line from theory to practice[R].Munich,Germany:Corporation of Obermeyer in Germany,2008:10-30.
[10]郭建湖,李小禾,杨果林.武广客运专线灰岩残积层红黏土路基变形特性及路堑边坡稳定性试验研究[R].武汉:中铁第四勘察设计院集团有限公司,2009:24-28.GUO Jian-hu,LI Xiao-he,YANG Guo-lin.Experimental studyon the subgrade deformation properties and cutting side slopedynamic stability of limestone residual deposits red clay alongthe Wuhan-Guangzhou passenger railway line[R].Wuhan:ChinaRailway Siyuan Survey and Design Group Co Ltd,2009:24-28.
[11]杨果林,刘晓红.高速铁路无砟轨道红黏土路基沉降控制与动力稳定性[M].北京:中国铁道出版社,2010:245-288.YANG Guo-lin,LIU Xiao-hong.Red clay subgrade settlementcontrol and dynamic stability analysis of ballastless track of highspeed railway[M].Beijing:China Railway Publishing House,2010:245-288.
[12]Prakash S.Soil dynamics[M].Mc Graw-Hill Company,1981:62-64.
[13]Rehfeld E.Wirkung der Zugüberfahrt auf Oberbau,Unterbauund Untergrund[J].Eisenbahningenieur,2000,51(12):485-493.Rehfeld E.Influences for intersection track to ground andunderground trains[J].Railway Engineer,2000,51(12):485-493.
[14]Gotschol A.Ver-nderlich elastisches und plastisches verhaltennichtbindiger b-den und schotter unter zyklisch dynamischerbeanspruchung[R].Hessen:Universit-t Kassel,2002:56-62.Gotschol A.Varying elastic and plastic behavior of cohesionlesssoil and gravel under cyclic loading[R].Hesse:University ofKassel,2002:56-62.
[15]DS 836—1997.Vorschrift für erdbau werke[S].DS 836—1997.Guide for subgrade engineering of railway[S].
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