不同降雨模式下土质路基边坡渗流场研究

夏 琼,窦顺,王旭

铁道工程学报 ›› 2014, Vol. 31 ›› Issue (9) : 35-39.

PDF(635 KB)
PDF(635 KB)
铁道工程学报 ›› 2014, Vol. 31 ›› Issue (9) : 35-39.
长大干线地质与路基

不同降雨模式下土质路基边坡渗流场研究

  • 夏 琼1,窦顺2,王旭1
作者信息 +

A Study on Seepage Field in Subgrade Slope Subjected to Various Rainfall Patterns

  • XIA Qiong1, DOU Shun2, WANG Xu1
Author information +
文章历史 +

摘要

研究目的:降雨是路基边坡失稳最主要的影响因素,其中降雨模式是主要的影响参数之一。本文基于二维饱和-非饱和渗流理论,利用数值计算的方法对后峰型、均布型、中峰型和前峰型4种降雨模式下路基边坡渗流场的变化规律进行研究。研究结论:(1)降雨强度和降雨持时对路肩处最大孔隙水压力umax和最大饱和深度Hsmax均影响显著;(2)渗透系数ksHsmax的影响存在一个敏感区,在敏感区之内,增加ks才能有效减小Hsmax和路基表层孔隙水压力,ks太小或太大均对路基稳定性不利;(3)中峰型和前峰型降雨模式下,路基边坡稳定性最不利时段受渗透系数影响显著,ks在敏感区之内和敏感区域之外较小一侧时,此时间段起点不受渗透系数影响,只与降雨模式有关,此时间段终点随ks的增大而提前;(4)后峰型降雨模式下路基边坡的稳定性最差,前峰型降雨模式下路基边坡的稳定性最好;(5)本文研究成果可为路基边坡防护与加固方案设计提供依据。

Abstract

Research purposes:Rainfall is one of the most important factors for subgrade slope failure, and rainfall patter is one of the most primary influence parameters. Based on the two-dimensional saturated-unsaturated seepage theory, numerical analyses are conducted to investigate the change rules of seepage field in subgrade slope subjected to rainfalls with four different patterns, i.e. delayed, uniform, central and advanced rainfall patterns.Research conclusions:(1) Both the maximum pore-water pressure umax and the maximum saturated depth Hsmax at shoulder are affected by rainfall intensity and rainfall duration observably. (2) There is a sensitive range of coefficient of permeability influencing on the maximum saturated depth, only within the sensitive range increasing coefficient of permeability could reduce Hsmax and subgrade surface pore-water pressure effectively. (3) Under central and advanced rainfall patterns, the most dangerous time stage of slope stability is obvious affected by coefficient of permeability, within the sensitive range and the less side outside the sensitive range, the starting point of the most dangerous time stage is not affected by coefficient of permeability, but the end time is advanced with coefficient of permeability increasing. (4) The stability of subgrade slope is the best under advanced rainfall pattern and the worst under delayed rainfall pattern. (5) The research results can provide basis and reference for slope protection and reinforcement design.

关键词

降雨模式 / 饱和-非饱和渗流 / 孔隙水压力 / 饱和深度 / 边坡稳定最不利时段

Key words

rainfall pattern / saturated-unsaturated seepage / pore-water pressure / saturated depth / the most dangerous time stage of slope stability

引用本文

导出引用
夏 琼, 窦顺, 王旭. 不同降雨模式下土质路基边坡渗流场研究[J]. 铁道工程学报, 2014, 31(9): 35-39
XIA Qiong, DOU Shun, WANG Xu. A Study on Seepage Field in Subgrade Slope Subjected to Various Rainfall Patterns[J]. Journal of Railway Engineering Society, 2014, 31(9): 35-39
中图分类号: TU43   

参考文献

[1] 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 (8): 1705-1709.
Liu Xinxi, Xia Yuanyou, Cai Junjie, etc. Study on Stability of High-filled Embankment Slope of Highly Weathered Soft Rock under Rainfall Infiltration [J]. Rock and Soil Mechanics, 2007(8): 1705-1709.
[2] 许建聪, 尚岳全, 陈侃福, 等. 强降雨作用下的浅层滑坡稳定性分析[J]. 岩石力学与工程学报, 2005 (18): 3246-3251.
Xu Jiancong, Shang Yuequan, Chen Kanfu, etc. Analysis of Shallow Landslide Stability under Intensive Rainfall [J]. Chinese Journal of Rock Mechanics and Engineering, 2005(18):3246-3251.
[3] 詹良通, 贾官伟, 陈云敏, 等. 考虑土体非饱和特性的无限长斜坡降雨入渗解析解[J]. 岩土工程学报, 2010(8): 1214-1220.
Zhan Liangtong, Jia Guanwei, Chen Yunmin, etc. Analytical Solution for Rainfall Infiltration into Infinite Long Slopes Considering Properties of Unsaturated Soil [J]. Chinese Journal of Geotechnical Engineering, 2010(8):1214-1220.
[4] 张卢明,何敏,郑明新,等. 降雨入渗对滑坡渗流场和稳定性的影响分析[J]. 铁道工程学报,2009 (7):15-19.
Zhang Luming, He Min, Zheng Mingxin, etc. Effects Analysis of Rainfall Infiltration on the Landslide Seepage Field and Stability [J]. Journal of Railway Engineering Society, 2009(7):15-19.
[5] 荣冠, 张伟, 周创兵. 降雨入渗条件下边坡岩体饱和非饱和渗流计算[J]. 岩土力学, 2005(10): 1545-1550.
Rong Guan, Zhang Wei, Zhou Chuangbing. Numerical Analysis of Saturated-unsaturated Seepage Problem of Rock Slope under Rainfall Infiltration [J]. Rock and Soil Mechanics, 2005(10): 1545-1550.
[6] 刘俊新, 刘育田, 胡启军. 非饱和地表径流-渗流和流固体耦合条件下降雨入渗对路堤边坡稳定性研究[J]. 岩土力学, 2010(3): 903-910.
Liu Junxin, Liu Yutian, Hu Qijun. Stability of Embankment Slope Subjected to Rainfall Infiltration Considering both Runoff-underground Seepage and Fluid-soild Coupling [J]. Rock and Soil Mechanics, 2010(3): 903-910.
[7] 邱战洪, 何春木, 朱兵见, 等. 不同降雨模式下山谷型垃圾填埋场水分运移及其稳定性研究[J]. 岩土力学, 2012(10): 3151-3155.
Qiu Zhanhong, He Chunmu, Zhu Bingjian, etc. Investigations of Water Transport in Valley-type MSW Landfills and Their Stabilities Subjected to Various Rainfall Patterns [J]. Rock and Soil Mechanics, 2012 (10): 3151-3155.
[8] 冯世进, 李夕林, 高丽亚. 不同降雨模式条件下填埋场封顶系统最大饱和深度[J]. 岩土工程学报, 2012(5): 924-930.
Feng Shijin, Li Xilin, Gao Liya. Maximum Saturated Depth over Barrier in Landfill Cover System under Various Rainfall Patterns [J]. Chinese Journal of Geotechnical Engineering, 2012(5): 924-930.
[9] 高凌霞,栾茂田,杨庆,等.非饱和土重塑粘土渗透性试验研究[J].岩土力学,2008(8):2267-2270.
Gao Lingxia, Luan Maotian, Yang Qing, etc. Experimental Study of Permeability of Unsaturated Remoulded Clays [J]. Rock and Soil Mechanics, 2008(8):2267-2270.
[10]Fredlund D G, Xing A Huang S. Predicting the Permeability Function for Unsaturated Soils Using the Soil-Water Characteristic curve[J]. Canadian Geotechnical Journal, 1994(31):533-546.

基金

长江学者和创新团队发展计划(IRT1139)

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