降雨条件下路堑高边坡的渗流应力响应分析
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摘要
为研究降雨对路堑边坡稳定性的影响,以某铁路路堑高边坡工程为依托,通过建立应力-渗流耦合模型,分析不同降雨条件下高边坡渗流场和应力场的变化规律。结果表明:随着降雨量的增加,边坡的水平位移先缓慢后急速增长,竖向位移受降雨影响相对较小;在大暴雨条件下,负孔隙水压力逐渐减小,渗透系数增大,土体逐渐趋于饱和状态;降雨强度的增加使得边坡的最大剪应变增加、安全系数减小,降雨对边坡的稳定性影响显著。
In order to study the effect of rainfall on the stability of cutting slopes,based on the high slope project of a certain railroad,the change laws of the seepage field and stress field under high rainfall conditions were analyzed by establishing a stress-infiltration coupled model.The results show that with the increase of rainfall,the horizontal displacement of the slope first increases slowly and then rapidly,while the vertical displacement is relatively less affected by the rainfall;under heavy rain conditions,the negative pore water pressure gradually decreases,the permeability coefficient increases,and the soil gradually becomes saturated;with the increase of rainfall intensity,the maximum shear strain of the slope increases and the safety factor decreases,suggesting that rainfall has a significant effect on the stability of slope.
In order to study the effect of rainfall on the stability of cutting slopes,based on the high slope project of a certain railroad,the change laws of the seepage field and stress field under high rainfall conditions were analyzed by establishing a stress-infiltration coupled model.The results show that with the increase of rainfall,the horizontal displacement of the slope first increases slowly and then rapidly,while the vertical displacement is relatively less affected by the rainfall;under heavy rain conditions,the negative pore water pressure gradually decreases,the permeability coefficient increases,and the soil gradually becomes saturated;with the increase of rainfall intensity,the maximum shear strain of the slope increases and the safety factor decreases,suggesting that rainfall has a significant effect on the stability of slope.
引文
[1]王瑞钢,闫澍旺,邓卫东.降雨作用下高填土质路堤边坡的渗流稳定分析[J].中国公路学报,2004,17(4):25-30.
[2]蒋中明,熊小虎,曾铃.基于FLAC3D平台的边坡非饱和降雨入渗分析[J].岩土力学,2014,35(3):855-861.
[3]周创兵,李典庆.暴雨诱发滑坡致灾机理与减灾方法研究进展[J].地球科学进展,2009,24(5):477-487.
[4]钱纪芸,张嘎,张建民.降雨条件下土坡变形机制的离心模型试验研究[J].岩土力学,2011,32(2):398-402.
[5]林鸿州,于玉贞,李广信,等.降雨特性对土质边坡失稳的影响[J].岩石力学与工程学报,2009,28(1):198-204.
[6]石诚鋆,阮永芬,施炳军,等.降雨入渗对边坡稳定性影响的敏感性分析[J].防灾减灾工程学报,2016,36(6):1002-1007.
[7]何忠明,王保林,胡庆国,等.强降雨条件下含软弱夹层土坡稳定性影响因素敏感性分析[J].长沙理工大学学报:自然科学版,2017,14(3):21-28.
[8]颜斌,倪万魁,刘海松.黄土边坡降水入渗规律及其稳定性研究[J].水文地质工程地质,2009,36(3):77-81.
[9]张少宏,康顺祥,李永红.降雨对黄土边坡稳定性的影响[J].水土保持通报,2005,25(5):42-44.
[10]黄蕾鸣,高和斌.强降雨对粤赣高速公路边坡稳定性影响及边坡响应特征的简要分析[J].公路交通科技,2006(9):56-57,66.
[11]胡晋川,谢永利,王文生.黄土公路阶梯状高路堑边坡稳定性研究[J].岩石力学与工程学报,2010,29(1):3093-3100.
[12]尹紫红,杨建中,吕晓楠,等.降雨条件下非饱和土路堑边坡稳定性的数值模拟分析[J].路基工程,2017(2):4-8.
[2]蒋中明,熊小虎,曾铃.基于FLAC3D平台的边坡非饱和降雨入渗分析[J].岩土力学,2014,35(3):855-861.
[3]周创兵,李典庆.暴雨诱发滑坡致灾机理与减灾方法研究进展[J].地球科学进展,2009,24(5):477-487.
[4]钱纪芸,张嘎,张建民.降雨条件下土坡变形机制的离心模型试验研究[J].岩土力学,2011,32(2):398-402.
[5]林鸿州,于玉贞,李广信,等.降雨特性对土质边坡失稳的影响[J].岩石力学与工程学报,2009,28(1):198-204.
[6]石诚鋆,阮永芬,施炳军,等.降雨入渗对边坡稳定性影响的敏感性分析[J].防灾减灾工程学报,2016,36(6):1002-1007.
[7]何忠明,王保林,胡庆国,等.强降雨条件下含软弱夹层土坡稳定性影响因素敏感性分析[J].长沙理工大学学报:自然科学版,2017,14(3):21-28.
[8]颜斌,倪万魁,刘海松.黄土边坡降水入渗规律及其稳定性研究[J].水文地质工程地质,2009,36(3):77-81.
[9]张少宏,康顺祥,李永红.降雨对黄土边坡稳定性的影响[J].水土保持通报,2005,25(5):42-44.
[10]黄蕾鸣,高和斌.强降雨对粤赣高速公路边坡稳定性影响及边坡响应特征的简要分析[J].公路交通科技,2006(9):56-57,66.
[11]胡晋川,谢永利,王文生.黄土公路阶梯状高路堑边坡稳定性研究[J].岩石力学与工程学报,2010,29(1):3093-3100.
[12]尹紫红,杨建中,吕晓楠,等.降雨条件下非饱和土路堑边坡稳定性的数值模拟分析[J].路基工程,2017(2):4-8.