多雨地区废弃岩渣填筑高路堤边坡稳定性分析及绿色防护技术
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摘要
随着我国交通基础设施建设规模的扩大以及节能减排、绿色交通发展战略的推进,道路施工对环境保护要求越来越高,多雨地区高填方路堤如何保证边坡稳定及实施防护成为了技术难题。结合向莆铁路尤溪车站36m高岩渣路堤工程,研究分析了降雨强度、降雨时长对高路堤稳定性影响及边坡失稳规律。结果表明:强降雨对边坡稳定性影响较大,在坡面表层出现径流现象,长时间强降雨会引起边坡中部局部失稳,并扩展连通至路堤顶部;低强度降雨对路堤稳定性影响相对较小,坡面表层未出现径流现象,随着时长增加,边坡坡脚处出现局部失稳,失稳范围随时长增长变化不明显。在此基础上,提出了多元加筋柔性排水绿色生态护坡技术,并进行了设计计算。研究结果对路基边坡防护计算设计及绿色护坡技术推广提供了参考依据。
With the expansion of the transportation infrastructure construction at home,the strict requirements in energy conservation and pollution emission reduction and the promotion of the green traffic development,it is more and more demanding in environmental protection to the construction of roads.Especially when tall embankments are filled in rainy regions,how to ensure the stability of the side slopes and how to implement the protective techniques have become technical difficulties.With the project of the 36 m-tall embankment filled with rock debris for the Youxi Station of the Xiang-Pu Railway as a practical example,studied and analyzed in the present paper are the effects of the raining strength and raining duration on the stability of the tall embankment and the law of the instability of the side slopes.The result of our research shows that strong rainfall has a relatively great effect on the stability of the side slopes,in which case the phenomenon of runoff will occur on the surface of the slope.And long strong rainfall may result in the local instability of the middle of the side slope,which may even develop to the top of the embankment.The low-strength rainfall has a relatively small effect on the stability of the embankment and the phenomenon of radial flow may not occur on the surface of the slope.With the time going on,local instability may occur at the foot of the side slope,but the change in the range of instability is not obvious with the time going on.Upon the basis of the research mentioned above,agreen ecological slope-retaining technique of multiple-element-reinforcing-and-flexible-drainage is put forward in the paper,with the related design and calculations performed.The fruits of our research may provide referential grounds for the protective design of and the calculations for the side slopes of a roadbed and the popularization of the green slope-retaining techniques.
With the expansion of the transportation infrastructure construction at home,the strict requirements in energy conservation and pollution emission reduction and the promotion of the green traffic development,it is more and more demanding in environmental protection to the construction of roads.Especially when tall embankments are filled in rainy regions,how to ensure the stability of the side slopes and how to implement the protective techniques have become technical difficulties.With the project of the 36 m-tall embankment filled with rock debris for the Youxi Station of the Xiang-Pu Railway as a practical example,studied and analyzed in the present paper are the effects of the raining strength and raining duration on the stability of the tall embankment and the law of the instability of the side slopes.The result of our research shows that strong rainfall has a relatively great effect on the stability of the side slopes,in which case the phenomenon of runoff will occur on the surface of the slope.And long strong rainfall may result in the local instability of the middle of the side slope,which may even develop to the top of the embankment.The low-strength rainfall has a relatively small effect on the stability of the embankment and the phenomenon of radial flow may not occur on the surface of the slope.With the time going on,local instability may occur at the foot of the side slope,but the change in the range of instability is not obvious with the time going on.Upon the basis of the research mentioned above,agreen ecological slope-retaining technique of multiple-element-reinforcing-and-flexible-drainage is put forward in the paper,with the related design and calculations performed.The fruits of our research may provide referential grounds for the protective design of and the calculations for the side slopes of a roadbed and the popularization of the green slope-retaining techniques.
引文
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[3]曾玲,史振宁,等.降雨入渗对边坡暂态饱和区分布特征的影响[J].中国公路学报,2017,30(01):25-34
[4]刘新喜,夏元友,蔡俊杰,等.降雨入渗下强风化软岩高填方路堤边坡稳定性研究[J].岩土力学,2007,28(08):1705-1709
[5]ZENG L,FU H Y,LI T,etc.The analysis of seepage characteristics and stability of carbonaceous mudstone embankment slope in rainfall condition[J].Advanced Materials Research,2012(446.449):1864-1868
[6]娄国充,岳祖润,刘尧军.青藏铁路冻土沼泽化斜坡湿地路基稳定性研究[J].土木工程学报,2009,142(06):97-101
[2]FREDLUND D.G.Slope stability analysis incorporatiuning the effect of soil suction[C]//Slope Stability.ANDERSON M G,RICHARDS K S.New York:Wiley,1987:113-144
[3]曾玲,史振宁,等.降雨入渗对边坡暂态饱和区分布特征的影响[J].中国公路学报,2017,30(01):25-34
[4]刘新喜,夏元友,蔡俊杰,等.降雨入渗下强风化软岩高填方路堤边坡稳定性研究[J].岩土力学,2007,28(08):1705-1709
[5]ZENG L,FU H Y,LI T,etc.The analysis of seepage characteristics and stability of carbonaceous mudstone embankment slope in rainfall condition[J].Advanced Materials Research,2012(446.449):1864-1868
[6]娄国充,岳祖润,刘尧军.青藏铁路冻土沼泽化斜坡湿地路基稳定性研究[J].土木工程学报,2009,142(06):97-101