低交通量公路粒料基层柔性路面抗剪性能研究
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摘要
本文从国内外低交通量公路路面结构形式以及设计年限内累计当量轴次小的特点出发,提出粒料基层柔性路面是一种适合低交通量公路的路面。
粒料基层柔性路面,面层比较薄,主要起功能性作用,基层是主要承重层,在荷载作用下,剪应力较大范围在粒料基层内,而粒料基层抗压强度高,抗剪强度低,荷载作用下以剪切破坏为主。所以粒料基层柔性路面为保证不发生剪切破坏,需验证剪应力。本文以此为出发点,提出两种剪应力计算方法,第一:计算标准轴载作用下路面中最大剪应力;第二:从散体力学出发,以标准轴载作用下路面中剪应力与正应力比值最大的面作为剪切破坏最薄弱面,以该面上最大剪应力与材料剪切抗力做比较,进行剪应力验算。粒料基层柔性路面剪应力验算应采用第二种剪应力验算方法。基于弹性层状体系理论,分别计算两种剪应力验算方法下最危险剪切面位置以及最危险剪切面上剪应力与正应力值,绘制了不同路面结构下剪应力与正应力诺谟图。并研究了沿路面结构深度方向剪应力变化规律。
最后通过粒料基层柔性路面剪应力验算例子,进一步说明粒料基层柔性路面剪应力验算的必要性,并提出剪应力不满足时的处理措施。
Based on pavement structure type at home and abroad and the character of low accumulative equivalent axle in the low-volume highway, the flexible pavement structure above the Granule base is considered to be suitable for the low-volume highway.
Because the thickness of the surfacing course of the flexible pavement structure above the Granule base is thin, it acts as a function effect. Correspondingly, the base course of the pavement structure undertakes mainly the effect of the traffic load. So the higher shearing stress exists in the base course. However, the shear strength of Granule materials is own inferior. To prevent shear failure, the checking of the shear stress is rather necessary. Firstly, under the standard axis load, the maximum shear stress of the Granule base can be acquired. Through comparing the maximum shear stress and the shear strength of the Granule material, the conclusion of checking calculation are got. Secondly, based on the granular mechanics, when the ratio of the shear stress and the normal stress is the biggest, the shear stress is considered to the most easily disruptive value of the kind of granular material. Through comparing the shear stress and the shear strength of the granular material, the conclusion of checking calculation are obtained. Based on the elastic layers system theory, Nomograph of the limiting shear stress’s position and the limiting the shear stress of three layers systems are obtained; and the rule of biggest shearing stress along the asphalt pavement structure depth direction are analyzed.
At last, combining with the example of the flexible pavement structure above the Granule base, the significance of the checking is further verified. The measure is proposed to solve the lack of the shear strength.
粒料基层柔性路面,面层比较薄,主要起功能性作用,基层是主要承重层,在荷载作用下,剪应力较大范围在粒料基层内,而粒料基层抗压强度高,抗剪强度低,荷载作用下以剪切破坏为主。所以粒料基层柔性路面为保证不发生剪切破坏,需验证剪应力。本文以此为出发点,提出两种剪应力计算方法,第一:计算标准轴载作用下路面中最大剪应力;第二:从散体力学出发,以标准轴载作用下路面中剪应力与正应力比值最大的面作为剪切破坏最薄弱面,以该面上最大剪应力与材料剪切抗力做比较,进行剪应力验算。粒料基层柔性路面剪应力验算应采用第二种剪应力验算方法。基于弹性层状体系理论,分别计算两种剪应力验算方法下最危险剪切面位置以及最危险剪切面上剪应力与正应力值,绘制了不同路面结构下剪应力与正应力诺谟图。并研究了沿路面结构深度方向剪应力变化规律。
最后通过粒料基层柔性路面剪应力验算例子,进一步说明粒料基层柔性路面剪应力验算的必要性,并提出剪应力不满足时的处理措施。
Based on pavement structure type at home and abroad and the character of low accumulative equivalent axle in the low-volume highway, the flexible pavement structure above the Granule base is considered to be suitable for the low-volume highway.
Because the thickness of the surfacing course of the flexible pavement structure above the Granule base is thin, it acts as a function effect. Correspondingly, the base course of the pavement structure undertakes mainly the effect of the traffic load. So the higher shearing stress exists in the base course. However, the shear strength of Granule materials is own inferior. To prevent shear failure, the checking of the shear stress is rather necessary. Firstly, under the standard axis load, the maximum shear stress of the Granule base can be acquired. Through comparing the maximum shear stress and the shear strength of the Granule material, the conclusion of checking calculation are got. Secondly, based on the granular mechanics, when the ratio of the shear stress and the normal stress is the biggest, the shear stress is considered to the most easily disruptive value of the kind of granular material. Through comparing the shear stress and the shear strength of the granular material, the conclusion of checking calculation are obtained. Based on the elastic layers system theory, Nomograph of the limiting shear stress’s position and the limiting the shear stress of three layers systems are obtained; and the rule of biggest shearing stress along the asphalt pavement structure depth direction are analyzed.
At last, combining with the example of the flexible pavement structure above the Granule base, the significance of the checking is further verified. The measure is proposed to solve the lack of the shear strength.
引文
[1]房性中.低交通量柔性铺面设计方法概论(上)[J].台湾:现代营建274,2001.6
[2] Gordon Keller,James Sherar. Low-Volume Roads Engineering Best Management Practices Field Guide.Verginia Tech,2003.7
[3]辽宁省交通厅公路管理局,长安大学等.西部地区农村公路建设关键技术研究.2005年12月
[4]卞凤兰.江苏省农村公路工程技术标准.东南大学硕士论文. 2005年3月
[5]宁夏交通厅.宁夏农村公路工程技术标准(试行). 2007年1月
[6]赵桂娟.低交通量公路技术标准与路面结构研究.长安大学硕士论文. 2005年5月
[7]袁承栋.低交通量公路典型路面结构研究.东南大学硕士论文. 2005年1月
[8]西安公路研究所.陕西省农村公路路面技术标准(建议稿). 2005年11月
[9]刘晓佳,何兆益等.西部地区县乡公路沥青路面设计参数研究.重庆交通学院学报, 2005(6)
[10]赵乐易.农村低交通量公路硬化粉煤灰路面研究.长安大学硕士论文. 2006年6月
[11] ALEX T. Design Guidelines for Low-Volume Macadam Pavement in South Africa[C]. Transportation research Board 1652,pp.67～75
[12] PAUL LARCHER. Toward a Low Cost Structures Design Manual for Rural Roads in Developing Countries [C]. Sixth international Conference on Low-Volume Roads,National Academy Press1995
[13]韩春华.芬兰的低交通量公路.国外公路, 1997(4)
[14] Minnesota Local Road Research Board. The Use of Geosynthetics to reinforce Low- Volume Road,2001.7
[15]王占军,王占臣.低等级公路路面结构中土工织物的设计与施工.黑龙江交通科技, 2004(1)
[16] University of Minnesota Department of Civil Engineering. Minnesota Low Volume Road Design 1998 . Minnesota Local Research Board
[17] University of Minnesota Department of Civil Engineering. Minnesota′s Design Guide for Low Volume Aggregate Surface Roads . Minnesota Local Road Research Board
[18] ANIMESH Das,S. K. MOHANTY. nalytical Design Criteria for Village Roads inIndia[C] . Transportation research record 1652,pp.76～81
[19] ALEX T.Design Guidelines for Low-Volume Macadam Pavements in South Africa[C] .Transportation research record2,2007(1)
[20] G.D.van ZYL,A.T.VISSER,J.A.DU PLESSIS.Guide lines for Structural Design of Low-Volume Rural Roads in Southern Africa[C] .Sixth International Conference on Low-Volume Roads,1999,pp.108～117
[21] H Wolff.Design Catalog for Low-Volume Roads Developed for South African Conditions[C] .Sixth International Conference on Low-Volume Roads,1999,pp.118～129
[22]2006年公路水路交通行业发展统计公报. http://www.stats.gov.cn/tjgb/qttjgb/qgqttjgb/t20070430_402402691.htm
[23]同济大学道路与交通工程研究所.半刚性基层沥青路面.北京:人民交通出版社,1991
[24]许志宏等.公路沥青路面典型结构研究[J].华东公路, 1998(2)
[25]I.K.克列因著,陈万佳译.散粒体结构力学.北京:中国铁道出版社,1983.07
[26]赵彭年.松散介质力学.地震出版社,1995.06 [27黄松元.散体力学.机械工业出版社,1993.04
[28]徐芝纶.弹性力学(上册).高等教育出版社,1990.03
[29]谭浩强. C语言程序设计.清华大学出版社,1999.12
[30]林绣贤.柔性路面结构设计方法.人民交通出版社. 1988
[31]公路柔性路面设计规范JTG D50-2006
[32]张超,郑南翔.路基路面试验检测技术.北京:人民交通出版社,2004.07
[2] Gordon Keller,James Sherar. Low-Volume Roads Engineering Best Management Practices Field Guide.Verginia Tech,2003.7
[3]辽宁省交通厅公路管理局,长安大学等.西部地区农村公路建设关键技术研究.2005年12月
[4]卞凤兰.江苏省农村公路工程技术标准.东南大学硕士论文. 2005年3月
[5]宁夏交通厅.宁夏农村公路工程技术标准(试行). 2007年1月
[6]赵桂娟.低交通量公路技术标准与路面结构研究.长安大学硕士论文. 2005年5月
[7]袁承栋.低交通量公路典型路面结构研究.东南大学硕士论文. 2005年1月
[8]西安公路研究所.陕西省农村公路路面技术标准(建议稿). 2005年11月
[9]刘晓佳,何兆益等.西部地区县乡公路沥青路面设计参数研究.重庆交通学院学报, 2005(6)
[10]赵乐易.农村低交通量公路硬化粉煤灰路面研究.长安大学硕士论文. 2006年6月
[11] ALEX T. Design Guidelines for Low-Volume Macadam Pavement in South Africa[C]. Transportation research Board 1652,pp.67～75
[12] PAUL LARCHER. Toward a Low Cost Structures Design Manual for Rural Roads in Developing Countries [C]. Sixth international Conference on Low-Volume Roads,National Academy Press1995
[13]韩春华.芬兰的低交通量公路.国外公路, 1997(4)
[14] Minnesota Local Road Research Board. The Use of Geosynthetics to reinforce Low- Volume Road,2001.7
[15]王占军,王占臣.低等级公路路面结构中土工织物的设计与施工.黑龙江交通科技, 2004(1)
[16] University of Minnesota Department of Civil Engineering. Minnesota Low Volume Road Design 1998 . Minnesota Local Research Board
[17] University of Minnesota Department of Civil Engineering. Minnesota′s Design Guide for Low Volume Aggregate Surface Roads . Minnesota Local Road Research Board
[18] ANIMESH Das,S. K. MOHANTY. nalytical Design Criteria for Village Roads inIndia[C] . Transportation research record 1652,pp.76～81
[19] ALEX T.Design Guidelines for Low-Volume Macadam Pavements in South Africa[C] .Transportation research record2,2007(1)
[20] G.D.van ZYL,A.T.VISSER,J.A.DU PLESSIS.Guide lines for Structural Design of Low-Volume Rural Roads in Southern Africa[C] .Sixth International Conference on Low-Volume Roads,1999,pp.108～117
[21] H Wolff.Design Catalog for Low-Volume Roads Developed for South African Conditions[C] .Sixth International Conference on Low-Volume Roads,1999,pp.118～129
[22]2006年公路水路交通行业发展统计公报. http://www.stats.gov.cn/tjgb/qttjgb/qgqttjgb/t20070430_402402691.htm
[23]同济大学道路与交通工程研究所.半刚性基层沥青路面.北京:人民交通出版社,1991
[24]许志宏等.公路沥青路面典型结构研究[J].华东公路, 1998(2)
[25]I.K.克列因著,陈万佳译.散粒体结构力学.北京:中国铁道出版社,1983.07
[26]赵彭年.松散介质力学.地震出版社,1995.06 [27黄松元.散体力学.机械工业出版社,1993.04
[28]徐芝纶.弹性力学(上册).高等教育出版社,1990.03
[29]谭浩强. C语言程序设计.清华大学出版社,1999.12
[30]林绣贤.柔性路面结构设计方法.人民交通出版社. 1988
[31]公路柔性路面设计规范JTG D50-2006
[32]张超,郑南翔.路基路面试验检测技术.北京:人民交通出版社,2004.07