红粘土路基水汽运移特性及防排水优化设计研究
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摘要
路基水分迁移主要是毛细作用下、降雨作用下产生地表径流和高水位造成路基内部产生渗流及日照温度场作用下产生的路基水汽迁移。路基在(裂缝)渗流作用、毛细作用以及温度场作用下,内部土体含水量、孔隙水压会发生变化,使得土体抗剪强度降低,土体产生湿陷和变形,从而引起一系列的路基水毁破坏。
本文主要研究非饱和土路基的水作用机理以及非饱和土路基水汽迁移特征、迁移规律及影响因素。其中包括毛细水、降雨渗流、裂隙流、水位升降等因素下的非饱和土路基水汽迁移规律,比如孔压、水分分布的发展变化,引发的路基强度稳定、路面结构安全等公路病害。
结合南方高液限、膨胀土类路基用红粘土性质,进行非饱和土水汽运移的室内试验研究,包括毛细水上升试验、常规固结剪切试验渗透试验以及土水特征曲线测定试验。
利用有限元分析软件Geo-studio,进行非饱和土水汽运移的模拟研究。建立非饱和土路基有限元模型,模拟水汽运移中的毛细迁移过程中水分分布变化、毛细水上升高度等。研究非饱和土路基在不同边界条件下水分和孔压动态变化。模拟路基在不同降雨历时、不同降雨边界条件、路基表面有无裂缝等情况下的水分运移规律,得出路基土内部水汽运移规律。针对非饱和土路基水汽运移模拟分析结果,引出路基路面防排水处理措施必要性。
Subgrade moisture migration mainly include some types that capillary action, embankment seepage caused by surface runoff generated by rainfall and high water level, and temperature water vapor changing generated by sunshine . The internal soil water content and pore water pressure will changes do to the effect of crack seepage, capillary action, and the temperature fields, correspondingly reducing soil strength, and finally soil come into subsidence and deformation , causing a series washout to subgrade .
As is concerned, this page mainly do research on gleization mechanism, subgrade moisture migration character and rules as well as influence factor,including moisture migration law caused by capillary action, rainfall and crack seepage, water level fluctuation. Such as the changes of water distribution and pore-water pressure which trigger disease of the road strength and stability, structural safety .
Combined with the properties of red clay with high liquid limit and expansion in the South area, we carry out laboratory test research on water vapor transport in unsaturated soil, including the capillary water rise test, routine shear consolidation test, permeability test and soil water characteristic curve measurement.
Finally, set a finite element model and do moisture migration simulation research on unsaturated soil subgrade with Geo-studio software, that are changes in water distribution and the limit height of capillary water can reach, water content and pressure changes under different rainfall conditions. And also analyze the law of moisture migration in subgrade under the conditions of different rainfall time and boundary conditions, whether there are cracks or not on embankment surface. Base on the moisture transportation modeling results of unsaturated-soil , lead to the necessity of pavement drainage treatment measures.
本文主要研究非饱和土路基的水作用机理以及非饱和土路基水汽迁移特征、迁移规律及影响因素。其中包括毛细水、降雨渗流、裂隙流、水位升降等因素下的非饱和土路基水汽迁移规律,比如孔压、水分分布的发展变化,引发的路基强度稳定、路面结构安全等公路病害。
结合南方高液限、膨胀土类路基用红粘土性质,进行非饱和土水汽运移的室内试验研究,包括毛细水上升试验、常规固结剪切试验渗透试验以及土水特征曲线测定试验。
利用有限元分析软件Geo-studio,进行非饱和土水汽运移的模拟研究。建立非饱和土路基有限元模型,模拟水汽运移中的毛细迁移过程中水分分布变化、毛细水上升高度等。研究非饱和土路基在不同边界条件下水分和孔压动态变化。模拟路基在不同降雨历时、不同降雨边界条件、路基表面有无裂缝等情况下的水分运移规律,得出路基土内部水汽运移规律。针对非饱和土路基水汽运移模拟分析结果,引出路基路面防排水处理措施必要性。
Subgrade moisture migration mainly include some types that capillary action, embankment seepage caused by surface runoff generated by rainfall and high water level, and temperature water vapor changing generated by sunshine . The internal soil water content and pore water pressure will changes do to the effect of crack seepage, capillary action, and the temperature fields, correspondingly reducing soil strength, and finally soil come into subsidence and deformation , causing a series washout to subgrade .
As is concerned, this page mainly do research on gleization mechanism, subgrade moisture migration character and rules as well as influence factor,including moisture migration law caused by capillary action, rainfall and crack seepage, water level fluctuation. Such as the changes of water distribution and pore-water pressure which trigger disease of the road strength and stability, structural safety .
Combined with the properties of red clay with high liquid limit and expansion in the South area, we carry out laboratory test research on water vapor transport in unsaturated soil, including the capillary water rise test, routine shear consolidation test, permeability test and soil water characteristic curve measurement.
Finally, set a finite element model and do moisture migration simulation research on unsaturated soil subgrade with Geo-studio software, that are changes in water distribution and the limit height of capillary water can reach, water content and pressure changes under different rainfall conditions. And also analyze the law of moisture migration in subgrade under the conditions of different rainfall time and boundary conditions, whether there are cracks or not on embankment surface. Base on the moisture transportation modeling results of unsaturated-soil , lead to the necessity of pavement drainage treatment measures.
引文
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[4] Remson, I., Hornberger, G. M. et al. Numerical methods in sub surface hydrology.
[5]李信,高骇,汪自力.饱和-非饱和土的渗流三维计算.水利学报,1992,11:63-68,80
[6]黄俊,苏向明,汪炜平.土坝饱和-非饱和渗流数值分析方法研究[J].岩土工程学报,1990,12:30-39.
[7]赤木浩一,大西有三,西恒誠.有限要素法による饱和-不饱和の渗透流解析[C]土木学会论文报告
[8]陈守义.考虑入渗和蒸发影响的土坡稳定性分析方法[J].岩土力学,1997,18: 8-22.
[9]邵龙潭.非饱和土中水流入渗和气体排出过程的求解[J].2000 11: 8-13.
[10]孙冬梅,朱岳明,张明进.非饱和带水–气二相流数值模拟研究[J].岩土工程学报.2007.02
[11]吴梦喜,高莲士.饱和-非饱和非稳定渗流数值分析[J].水利学报,1999,44(12):38-42
[12]朱军,刘光廷,陆述远.饱和非饱和三维多孔介质非稳定渗流分析[J].武汉大学学报(工学版),2001,34(3):5-9
[13]黄茂松,贾苍琴;考虑非饱和非稳定渗流的土坡稳定分析,第二届全国非饱和土学术研讨会论文集,627-634
[14]刘小平,赵明华.降雨对非饱和土路基含水量的影响分析,湖南大学学报(自然科学版), 2008,35(8):8-13
[15]张培文,刘德富,黄达海,宋玉普,饱和-非饱和非稳定渗流的数值模拟,岩土力学, 2003,24(6):927-930
[16]孙冬梅;朱岳明;张明进,库水位下降时的岸坡非稳定渗流问题研究, 2008,29(7):1807-1812
[17]朱岳明;龚道勇,三维饱和非饱和渗流场求解及其逸出面边界条件处理法。水科学进展,2003,14(1):67-71
[18]李继祥;姜兆华;何翔;刘肖凡.降雨条件下非饱和土边坡流固耦合数值模拟,武汉理工大学学报, 2009,02
[19]方云.毛细体系中界面力平衡方程的通式及其应用[J].无锡轻工大学学报,1996,15(2):134-139
[20]赵明华,刘小平,陈安.非饱和土路基毛细作用分析,公路交通科技,2008,25(8):26-30
[21]姚华,张喜发,张冬青.影响粗粒土毛细水上升高度的因素研究,勘察科学技术2007,1:10-12
[22]霍玉霞,栾海,宋永焕.土的毛细性试验研究及分析,广东公路交通,2006年增刊,138-143
[23]陈晋中,毛细水作用下低路基强度和变形特性研究,山西大同大学学报,2008,24(3):53-55
[24]S.Assouline.A model for soil relative hydraulic conductivity based on the water retention characteristic curve[J].Water Reoucses Research,2001,37(2):265 -271
[25]王铁行.非饱和黄土路基水分场的数值分析,岩土工程学报,2008,30(1):41-45
[26]刘兴旺;戴源夏;基于非饱和土理论的降雨入渗路基稳定性分析,公路交通技术,2009,3:1-3
[27]吴宏伟;陈守义;庞宇威,雨水入渗对非饱和土坡稳定性影响的参数研究,岩土力学,1999,20(1):1-13
[28]魏宁;茜平一;傅旭东;降雨和蒸发对土质边坡稳定性的影响,岩土力学,2006,27(5):778-786
[29]李守德,王保田,许永振,周阜军.路基非饱和土水分运移及其对边坡稳定性的影响,中南公路工程,2005,30(4)53-56
[30]魏云杰,许模,卢书强,杨艳娜,任加国.西部公路路基内部排水效果模拟研究[J].中国地质灾害与防治学报,2003,14(1):31-34.
[31]杨艳娜,许模,边坡失稳段路基的排水系统设计,长安大学学报,2003.5
[32]谭新,陈善雄,杨明.降雨条件下土坡饱和-非饱和渗流分析[J].岩土力学,2003,24(3):381-383
[33]刘建军,熊俊,何翔.降雨条件下岩土饱和-非饱和渗流分析[J].岩土力学,2004,25(2):559-563
[34]姚海林,郑少河,李文斌,陈守义.降雨入渗对非饱和膨胀土边坡稳定性影响的参数研究[J].岩石力学与工程学报,2002,21(7):1034-1039
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