高速铁路路基填料改良试验研究
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摘要
高速铁路对路基填料的要求较普通铁路更加严格,我国幅员辽阔,地质条件复杂多样,土的地域性差异大。随着高速铁路修建工作在全国范围内广泛开展,能直接用于路基填筑的填料匮乏的情况普遍存在,通常需要对高速铁路建设沿线不合格填料进行改良后使用。因此,高速铁路路基填料改良的研究具有现实意义。本文针对不符合高速铁路基床底层和高速铁路基床以下路堤填筑的C组细砂填料进行了物理改良研究,现场填筑结果表明改良填料达到设计要求,改良取得了理想的效果。本文研究内容主要包括以下几方面：
1.通过颗粒分析试验对原填料的基本属性进行了研究,确定了填料的类型和分组,对照《高速铁路设计规范(试行)》(TB10621-2009)对高速铁路路基填料要求,确定填料不能直接用于高速铁路基床底层和基床以下路堤的填筑,需要改良。
2.总结分析了粗颗粒含量对粗粒土填料工程力学性质的影响,从填料自身特点出发,提出了增加填料中粗颗粒含量的方式对填料进行物理改良的方案,并研究确定了掺入粗颗粒的类型和级配组成。
3.进行不同粗颗粒含量改良填料的重型击实试验和大型三轴剪切试验,研究了填料的密实特性,强度特性和变形特性随粗颗粒含量的变化规律,确定最优的粗颗粒掺入量。
4.利用改良填料进行现场填筑,研究填料在不同碾压遍数下的压实程度以及填筑路基的承载力和变形特性,探讨了改良填料的填筑效果,根据填料填筑特性确定了填筑工艺。
5.进行地基系数K30,二次变形模量Ev2和动态变形模量Evd之间的相关性研究,确定了K30、Ev2和Evd间的函数关系,提出通过动态变形模量间接判断地基系数和二次变形模量的检测方案。
High-speed railway subgrade requires higher quality fillers than ordinary railways. China has a vast, complex and diverse geological condition,soil distribution characteristics are not the same, therefore, with the high-speed railway construction launched extensively throughout the country, the lack of high quality fillers will inevitably hanppen,and the unqualified fillers need to be improved for using, so studying on improving unqualified fillers for high-speed railway using is of great significance. This paper studies on physical improvement of C group fine sand, which is not qualified for the constructions of high-speed railway subgrade and embankment. Results of improved filler field filling experiment show that the improvement achieved the desired effect. The major work and research contents are as following:
1. According to particle analysis test results, the type and group of the raw filler are studied to determine whether it is qualified for the constructions of high-speed railway subgrade.
2. Based on theorectical research results and the naure of the filler, a raw filler improving programe is proposed, in which crushed stone is used to change the particle size distribution and improve the engineering properties, the particle size distribution of the crushed stone and the reseaching programe for determination of crushed stone content are also studied.
3.The changing properties of density,strength and deformation of filler according to the content change of coarse particles are studied by heavy compaction test and large-scale triaxial shear test. According on the study results, the final filler improving programe is proposed.
4. The density, strength and deformation properties of improved filler are studied by carrying out field filling experiment, according to the results,improved filler construction technique is defined.
5.The relaitions between K30, Ev2 and Evd are studied, based on the results of which, a high efficiency quality testing methord is studied and suggested.
1.通过颗粒分析试验对原填料的基本属性进行了研究,确定了填料的类型和分组,对照《高速铁路设计规范(试行)》(TB10621-2009)对高速铁路路基填料要求,确定填料不能直接用于高速铁路基床底层和基床以下路堤的填筑,需要改良。
2.总结分析了粗颗粒含量对粗粒土填料工程力学性质的影响,从填料自身特点出发,提出了增加填料中粗颗粒含量的方式对填料进行物理改良的方案,并研究确定了掺入粗颗粒的类型和级配组成。
3.进行不同粗颗粒含量改良填料的重型击实试验和大型三轴剪切试验,研究了填料的密实特性,强度特性和变形特性随粗颗粒含量的变化规律,确定最优的粗颗粒掺入量。
4.利用改良填料进行现场填筑,研究填料在不同碾压遍数下的压实程度以及填筑路基的承载力和变形特性,探讨了改良填料的填筑效果,根据填料填筑特性确定了填筑工艺。
5.进行地基系数K30,二次变形模量Ev2和动态变形模量Evd之间的相关性研究,确定了K30、Ev2和Evd间的函数关系,提出通过动态变形模量间接判断地基系数和二次变形模量的检测方案。
High-speed railway subgrade requires higher quality fillers than ordinary railways. China has a vast, complex and diverse geological condition,soil distribution characteristics are not the same, therefore, with the high-speed railway construction launched extensively throughout the country, the lack of high quality fillers will inevitably hanppen,and the unqualified fillers need to be improved for using, so studying on improving unqualified fillers for high-speed railway using is of great significance. This paper studies on physical improvement of C group fine sand, which is not qualified for the constructions of high-speed railway subgrade and embankment. Results of improved filler field filling experiment show that the improvement achieved the desired effect. The major work and research contents are as following:
1. According to particle analysis test results, the type and group of the raw filler are studied to determine whether it is qualified for the constructions of high-speed railway subgrade.
2. Based on theorectical research results and the naure of the filler, a raw filler improving programe is proposed, in which crushed stone is used to change the particle size distribution and improve the engineering properties, the particle size distribution of the crushed stone and the reseaching programe for determination of crushed stone content are also studied.
3.The changing properties of density,strength and deformation of filler according to the content change of coarse particles are studied by heavy compaction test and large-scale triaxial shear test. According on the study results, the final filler improving programe is proposed.
4. The density, strength and deformation properties of improved filler are studied by carrying out field filling experiment, according to the results,improved filler construction technique is defined.
5.The relaitions between K30, Ev2 and Evd are studied, based on the results of which, a high efficiency quality testing methord is studied and suggested.
引文
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[2]李向国.高速铁路技术(第二版).北京：中国铁道出版社,2010.8-11
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[15]Al-Abdul Wahhab HI, Asi, I M. Improvement of Marl and Dune Sand for Highway Construction in Arid Areas. Building and Environment,1997,32(3):271-279
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[38]Bishop A W, Aipan I,et al.Factors Controlling the Shear Strength of Partly Saturated Cohesive Soil.ASCE Research Conference on the Shear Strength of Cohesive Soils,Univ. of Colorado,Boulder,1960,503-532
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[40]Lu Z J, Zhang H M, et al. Shear Strength Characteristics of Compacted Expansive Soil. Prpceedings of the International Conference on Engineering Problems of Regional Soil,Beijing,1998:629-632
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[43]谢婉丽,王家鼎等.土石粗粒料的强度和变形特性的试验研究.岩石力学与工程学报,2005,24(3)：430-437
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[2]李向国.高速铁路技术(第二版).北京：中国铁道出版社,2010.8-11
[3]顾尚华.中国高速铁路迅速崛起.交通与运输,2010(4)：15-17
[4]铁道科学研究院高速铁路铁技术研究组.高速铁路技术.北京：中国铁道出版社,2005.17-18
[5]刘金升.高速铁路高路堤稳定性分析及工后沉降预测：[硕士学位论文].成都：西南交通大学,2005
[6]Arpad Kezdi著,张起森等译.稳定土道路.北京：人民交通出版社,1989.25
[7]张忠.水泥改良土填料试验研究初探.研究与设计,2010,4：18-20
[8]卢肇均.地基处理手册.北京：中国建筑工业出版社,1988.281-295
[9]孙立川,韩杰.水泥加固土无侧限抗压强度影响因素分析及预测.地基处理,1994(4)：31-37
[10]胡萍,王永和,卿启湘.软岩改良土特性室内试验研究.湖南工业大学学报,2007,21(2)：96-99
[11]法国经济发展指导合作部编,陈道才等编译,潘文革等校.国外道路手册.北京：人民交通出版社,1980.105-168
[12]Bell F G. Lime stabilization of clay minerals and soils. Engineering Geology,1996, 412(4):223-237
[13]Osula D O A. Lime stabilization of clay minerals and soils. Engineering Geology, 1996,42(1):71-80
[14]Locat J, Tremblay H. Mechanical and Hydraulic Behavior of a Soft Inorganic Clay Treated with Llime. Canadian Geotechnical Journal,1996,33(4):654-659
[15]Al-Abdul Wahhab HI, Asi, I M. Improvement of Marl and Dune Sand for Highway Construction in Arid Areas. Building and Environment,1997,32(3):271-279
[16]解松芳,郭跃华等.石灰改改良膨胀土试验研究.内蒙古农业大学学报,2008,29(4)：180-182
[17]陆益成.高液限粘土石灰改良强度特征与应用.道路工程,2009,(12)：80-82
[18]刘林芽,高柏松.黏土改良的石灰剂量随时间变化规律的研究.铁道建筑,2007,(8)：47-49
[19]贺建清,张家生.石灰改良软土路基填料饱水强度特征性研究.矿冶工程,2004,24(4)：18-21
[20]杨广庆,荀国利.高速铁路路基改良土的有关问题.铁道标准设计,2003,(5)：15-16
[21]毛世福.武广客运专线泥质粉砂岩填料物理改良研究.铁道建筑技术,2009,(4)：1-6
[22]范云,汪英珍.细砂填料改良技术的试验研究.岩土力学,2003,24(6)：965-968
[23]赵明,张铮.秦沈客运专线辽中路段路堤填料的改良.路基工程,2001,(2)：49-51
[24]孙冀.砂砾改良高液限红粘土的试验研究.中国西部科技,2008,23(7)：22-24
[25]王晓明.客运专线路基填料改良试验研究.铁道工程学报,2010,(3)：24-27
[26]屈泽刚,陈志华等.风积沙路基填筑料的物理改良研究.铁道建筑技术,2010,(3)：138-140
[27]郭庆国.粗粒土的工程特性及应用.郑州：黄河水利出版社,1998,84
[28]朱宏祥,赵小兵.粗粒土最大干密度试验研究.西部探矿工程,2009,(1)：46-49
[29]孔祥臣.土石混合料演示特性的试验研究：[硕士学位论文].重庆：重庆交通学院,2007
[30]刘宏,韩文喜等.砂砾石土料的压实特性.三峡大学学报,2002,24(4)：297-299
[31]钟晓雄,袁建新.颗粒材料的剪胀模型.岩土力学,1992,13(1)：1-10
[32]Rowe P W.The Stress-Dilatancy Relation for Static Equilibrium of an Assembly of Perticals in Contact.Proc.Royal.Soc.A,1962,296:500-527
[33]Lade P V, Yamamuro J A, Bopp P A. Significance of Particle Crushing in Granular Materials. Journal of Geotechnical Engineering,1996,122(4):309-316
[34]Lee I K, Coop M R. Intrinsic Behavior of a Decomposed Granite Soil.Geotechnique, 1995,45(1):117-130
[35]李广信.高等土力学.北京：清华大学出版社,2004,132
[36]郭庆国.关于粗料土抗剪强度特性的试验研究.水利学报,1987,(5)：59-65
[37]张克昌,汪友平.含泥沙砾石的强度特性.岩土工程学报,1985,7(6)：51-9.
[38]Bishop A W, Aipan I,et al.Factors Controlling the Shear Strength of Partly Saturated Cohesive Soil.ASCE Research Conference on the Shear Strength of Cohesive Soils,Univ. of Colorado,Boulder,1960,503-532
[39]Fredlund D G, Morgenstern N R,et al.The Shear Strength of Unsaturated Soils.Canadian Geotechnical Journal,1978,(15):313-321
[40]Lu Z J, Zhang H M, et al. Shear Strength Characteristics of Compacted Expansive Soil. Prpceedings of the International Conference on Engineering Problems of Regional Soil,Beijing,1998:629-632
[41]郭庆国.粗粒土的抗剪强度特性及其参数.陕西水力发电,1990,(3)：29-36
[42]刘开明,屈智炯等.粗粒土的工程特性及本构模型研究.程度科技大学学报,1993,(6)：93-102
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