降雨入渗条件下多级黄土高边坡稳定性分析
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摘要
在西北地区进行基础工程建设,遇到了大量的多级黄土高边坡工程。边坡工程属于永久性工程,难免遇到降雨状况。降雨入渗会引起边坡土体饱和度与土体重度的变化,进而导致边坡体基质吸力与有效应力场的变化,使边坡的稳定性受到较大的影响。本文通过考虑边坡体不同深度处基质吸力随雨水入渗的变化情况,建立了渗流场与应力场的耦合计算模型,对降雨入渗条件下多级黄土高边坡的稳定性进行分析。最后,依托实际边坡工程,利用PLAXIS 3D岩土有限元软件,建立边坡稳定性计算模型,通过设置降雨量随时间的变化函数与渗流边界条件,进行降雨入渗条件下多级黄土高边坡的稳定性数值计算,并与理论分析结果进行了对比分析。根据数值计算结果可得到多级黄土高边坡在降雨入渗条件下的变形、基质吸力、有效应力、潜在滑移面以及安全系数的变化情况,从而对降雨入渗影响下多级黄土高边坡的稳定性做出分析。研究结果可为降雨入渗条件下多级黄土高边坡的稳定性的研究提供一定的指导作用。
In the northwest,a lot of multi-stage high slopes with loess have been encountered in the construction of basic engineering. Slope engineering belongs to permanent project. So it is unavoidable to meet the conditions of rainfall. Under rainfall infiltration,the degree of saturation and mass of soil slope increase,which can further cause the change of slope matric suction and effective stress. As a result,the stability of the slope can be greatly influenced. In this paper,the coupling calculation model of seepage field and stress field is established. It considers the changes of the matrix suction as the rain water infiltration at the different depths of the slope body. Then,the stability of the multi-stage high slope with loess under the condition of rainfall infiltration can be analyzed. Then,according to an actual engineering and using the PLAXIS 3 D geotechnical finite element software,the calculation model of slope stability is established. By setting the variation function of rainfall with the time and boundarycondition,the stability calculation of multi-stage high slope with loess is carried out under the condition of rainfall infiltration. And then,The numerical calculation results are compared with the theoretical calculation results.According to the numerical calculation results,the changes of the deformation,matrix suction,effective stress,potential slip surface and safety factor of the multi-stage high slope with loess under the condition of rainfall infiltration are obtained. And the stability of the multi-stage high slope with loess under the condition of rainfall infiltration are analyzed. The study results can provide some guidance for the design of the multi-stage high slope with loess under the rainfall infiltration.
In the northwest,a lot of multi-stage high slopes with loess have been encountered in the construction of basic engineering. Slope engineering belongs to permanent project. So it is unavoidable to meet the conditions of rainfall. Under rainfall infiltration,the degree of saturation and mass of soil slope increase,which can further cause the change of slope matric suction and effective stress. As a result,the stability of the slope can be greatly influenced. In this paper,the coupling calculation model of seepage field and stress field is established. It considers the changes of the matrix suction as the rain water infiltration at the different depths of the slope body. Then,the stability of the multi-stage high slope with loess under the condition of rainfall infiltration can be analyzed. Then,according to an actual engineering and using the PLAXIS 3 D geotechnical finite element software,the calculation model of slope stability is established. By setting the variation function of rainfall with the time and boundarycondition,the stability calculation of multi-stage high slope with loess is carried out under the condition of rainfall infiltration. And then,The numerical calculation results are compared with the theoretical calculation results.According to the numerical calculation results,the changes of the deformation,matrix suction,effective stress,potential slip surface and safety factor of the multi-stage high slope with loess under the condition of rainfall infiltration are obtained. And the stability of the multi-stage high slope with loess under the condition of rainfall infiltration are analyzed. The study results can provide some guidance for the design of the multi-stage high slope with loess under the rainfall infiltration.
引文
Dong W W,Zhu H H,Sun Y J,et al.2016.Current status and new progress on slope deformation monitoring technologies[J].Journal o Engineering Geology,24(6):1088-1095.
Kong Y F,Song E X,Yang J,et al.2013.Rainfall's effect on the stability of unsaturated slope[J].Journal of Civil Architectural and Environmental Engineering,35(6):16-21.
Kong Y F,Zhou M J,Song E X,et al.2014.Slope stability analysis in consideration of rainfall influence based on PLAXIS software[J]Hydro-Science and Engineering,3:70-76.
Li G X.2016.Advanced soil mechanics[M].Beijing:Tsinghua University Press:114-202.
Li H Q,Sun H Y,Sun X M,et al.2009.Influence of rainfall infiltration on slopes by physical model test[J].Chinese Journal o Geotechnical Engineering,31(4):589-594.
Li Y,Wu J,Li K.2012.Saturated-unsaturated seepage analysis based on FLAC3D[J].Rock and Soil Mechanics,33(2):617-622.
Lu N,Likos W J.2012.Unsaturated soil mechanics[M].Wei C F,Hou L,Jian W X,translation.Beijing:High Education Press:195-291.
Ping Y,Liu M Z,Zheng S H.2004.Stability analysis of expansive soil slope with rainfall infiltration[J].Chinese Journal of Rock Mechanics and Engineering,23(1):4478-4484.
Tan L,Wei C F,Tian H H,et al.2017.Experimental study on characteristics of pore water distribution and water-holding capacity of soil[J].Journal of Engineering Geology,25(1):73-79.
Tan W H,Qu S J,Gao D Q,et al.2010.Effects of rain infiltration on slope stability[J].Journal of Wuhan University of Technology,32(15):39-43.
Wang G,Sun P,Wu L Z,et al.2017.Experimental study on mechanism of shallow loess landslides induced by rainfall[J].Journal of Engineering Geology,25(5):1252-1263.
Wang R,Zhang G,Zhang J M.2010.Centrifuge modeling of rainfallinduced deformation of slopes with weak layers[J].Chinese Journal of Geotechnical Engineering,32(10):1582-1587.
Wang X Q,Zhang Y X,Zou W L,et al.2010.Numerical simulation for unsaturated road-embankment deformation and slope stability under rainfall infiltration[J].Rock and Soil Mechanics,31(11):3640-3645.
Wu C F,Zhu X R,Yin X T,et al.2008.Analysis of soil slope's transient stability under intensive rainfall[J].Rock and Soil Mechanics,29(2):386-391.
Wu J J,Wang C H,Li G X.2004.Influence of matric suction in unsaturated soils on slope stability[J].Rock and Soil Mechanics,25(5):732-736.
Xie C Q,Pan K,Liao C S,et al.2017.Landslide mechanism and treatment measures for high fill slope at airport in southwestern China[J].Journal of Engineering Geology,25(4):1083-1093.
Xiong Y L,Zhu H H,Ye G L,et al.2017.Analysis of failure of unsaturated soil slope due to rainfall based on soil-water-air seepage-deformation coupling FEM[J].Rock and Soil Mechanics,38(1):284-290.
Xu H,Zhu Y W,Cai Y Q,et al.2005.Stability analysis of unsaturated soil slopes under rainfall infiltration[J].Rock and Soil Mechanics,26(12):1957-1962.
Xu Q,Tan X H,Shen M F.2012.Stability analysis of soil slopes under rainfall infiltration[J].Chinese Journal of Geotechnical Engineering,34(S):254-259.
Zhang S,Pei X J,Huang R Q,et al.2017.Rainfall induced instability mechanism of high embankment retaining loess slope[J].Journal of Engineering Geology,25(4):1094-1104.
董文文,朱鸿鹄,孙义杰,等.2016.边坡变形监测技术现状及新进展[J].工程地质学报,24(6):1088-1095.
孔郁斐,宋二祥,杨军,等.2013.降雨入渗对非饱和土边坡稳定性的影响[J].土木建筑与环境工程,35(6):16-21.
孔郁斐,周梦佳,宋二祥,等.2014.利用PLAXIS软件计算考虑降雨的边坡稳定性[J].水利水运工程学报,3:70-76.
李毅,伍嘉,李坤,等.2012.基于FLAC3D的饱和-非饱和渗流分析[J].岩土力学,33(2):617-622.
李广信.2016.高等土力学[M].北京:清华大学出版社:114-202.
李焕强,孙红月,孙新民,等.2009.降雨入渗对边坡性状影响的模型实验研究[J].岩土工程学报,31(4):589-594.
Lu N,Likos W J.2012.非饱和土力学[M].韦昌富,侯龙,简文星,译.北京:高等教育出版社:195-291.
平扬,刘明智,郑少河.2004,降雨入渗条件下的膨胀土边坡稳定性分析[J].岩石力学与工程学报,23(增1):4478-4484.
谭龙,韦昌富,田慧会,等.2017土体持水特性及孔隙水分布特性的试验研究[J].工程地质学报,25(1):73-79.
谭文辉,璩世杰,高丹青,等.2010.降雨入渗对边坡稳定性的影响分析[J].武汉理工大学学报,32(15):39-43.
王睿,张嘎,张建民.2010.降雨条件下含软弱夹层土坡的离心模型试验研究[J].岩土工程学报,32(10):1582-1587.
王刚,孙萍,吴礼舟,等.2017.降雨诱发浅表层黄土滑坡机理实验研究[J].工程地质学报,25(5):1252-1263.
王协群,张有祥,邹维列,等.2010.降雨入渗条件下非饱和路堤变形与边坡的稳定数值模拟[J].岩土力学,31(11):3640-3645.
吴俊杰,王成华,李广信.2004.非饱和土基质吸力对边坡稳定的影响[J].岩土力学,25(5):732-736.
吴长富,朱向荣,尹小涛,等.2008.强降雨条件下土质边坡瞬态稳定性分析[J].岩土力学,29(2):386-391.
谢春庆,潘凯,廖崇高.等.2017.西南某机场高填方边坡滑塌机制分析与处理措施研究[J].工程地质学报,25(4):1083-1093.
熊勇林,朱合华,叶冠林,等.2017.降雨入渗引起非饱和土边坡破坏的水-土-气三相渗流-变形耦合有限元分析[J].岩土力学,38(1):284-290.
徐晗,朱以文,蔡元奇,等.2005.降雨入渗条件下非饱和土边坡稳定分析[J].岩土力学,26(12):1957-1962.
徐全,谭晓慧,沈梦芬.2012.降雨入渗条件下土质边坡的稳定性分析[J].岩土工程学报,34(增):254-259.
张硕,裴向军,黄润秋,等.2017.降雨诱发黄土高填方支挡边坡失稳机理研究[J].工程地质学报,25(4):1094-1104.
Kong Y F,Song E X,Yang J,et al.2013.Rainfall's effect on the stability of unsaturated slope[J].Journal of Civil Architectural and Environmental Engineering,35(6):16-21.
Kong Y F,Zhou M J,Song E X,et al.2014.Slope stability analysis in consideration of rainfall influence based on PLAXIS software[J]Hydro-Science and Engineering,3:70-76.
Li G X.2016.Advanced soil mechanics[M].Beijing:Tsinghua University Press:114-202.
Li H Q,Sun H Y,Sun X M,et al.2009.Influence of rainfall infiltration on slopes by physical model test[J].Chinese Journal o Geotechnical Engineering,31(4):589-594.
Li Y,Wu J,Li K.2012.Saturated-unsaturated seepage analysis based on FLAC3D[J].Rock and Soil Mechanics,33(2):617-622.
Lu N,Likos W J.2012.Unsaturated soil mechanics[M].Wei C F,Hou L,Jian W X,translation.Beijing:High Education Press:195-291.
Ping Y,Liu M Z,Zheng S H.2004.Stability analysis of expansive soil slope with rainfall infiltration[J].Chinese Journal of Rock Mechanics and Engineering,23(1):4478-4484.
Tan L,Wei C F,Tian H H,et al.2017.Experimental study on characteristics of pore water distribution and water-holding capacity of soil[J].Journal of Engineering Geology,25(1):73-79.
Tan W H,Qu S J,Gao D Q,et al.2010.Effects of rain infiltration on slope stability[J].Journal of Wuhan University of Technology,32(15):39-43.
Wang G,Sun P,Wu L Z,et al.2017.Experimental study on mechanism of shallow loess landslides induced by rainfall[J].Journal of Engineering Geology,25(5):1252-1263.
Wang R,Zhang G,Zhang J M.2010.Centrifuge modeling of rainfallinduced deformation of slopes with weak layers[J].Chinese Journal of Geotechnical Engineering,32(10):1582-1587.
Wang X Q,Zhang Y X,Zou W L,et al.2010.Numerical simulation for unsaturated road-embankment deformation and slope stability under rainfall infiltration[J].Rock and Soil Mechanics,31(11):3640-3645.
Wu C F,Zhu X R,Yin X T,et al.2008.Analysis of soil slope's transient stability under intensive rainfall[J].Rock and Soil Mechanics,29(2):386-391.
Wu J J,Wang C H,Li G X.2004.Influence of matric suction in unsaturated soils on slope stability[J].Rock and Soil Mechanics,25(5):732-736.
Xie C Q,Pan K,Liao C S,et al.2017.Landslide mechanism and treatment measures for high fill slope at airport in southwestern China[J].Journal of Engineering Geology,25(4):1083-1093.
Xiong Y L,Zhu H H,Ye G L,et al.2017.Analysis of failure of unsaturated soil slope due to rainfall based on soil-water-air seepage-deformation coupling FEM[J].Rock and Soil Mechanics,38(1):284-290.
Xu H,Zhu Y W,Cai Y Q,et al.2005.Stability analysis of unsaturated soil slopes under rainfall infiltration[J].Rock and Soil Mechanics,26(12):1957-1962.
Xu Q,Tan X H,Shen M F.2012.Stability analysis of soil slopes under rainfall infiltration[J].Chinese Journal of Geotechnical Engineering,34(S):254-259.
Zhang S,Pei X J,Huang R Q,et al.2017.Rainfall induced instability mechanism of high embankment retaining loess slope[J].Journal of Engineering Geology,25(4):1094-1104.
董文文,朱鸿鹄,孙义杰,等.2016.边坡变形监测技术现状及新进展[J].工程地质学报,24(6):1088-1095.
孔郁斐,宋二祥,杨军,等.2013.降雨入渗对非饱和土边坡稳定性的影响[J].土木建筑与环境工程,35(6):16-21.
孔郁斐,周梦佳,宋二祥,等.2014.利用PLAXIS软件计算考虑降雨的边坡稳定性[J].水利水运工程学报,3:70-76.
李毅,伍嘉,李坤,等.2012.基于FLAC3D的饱和-非饱和渗流分析[J].岩土力学,33(2):617-622.
李广信.2016.高等土力学[M].北京:清华大学出版社:114-202.
李焕强,孙红月,孙新民,等.2009.降雨入渗对边坡性状影响的模型实验研究[J].岩土工程学报,31(4):589-594.
Lu N,Likos W J.2012.非饱和土力学[M].韦昌富,侯龙,简文星,译.北京:高等教育出版社:195-291.
平扬,刘明智,郑少河.2004,降雨入渗条件下的膨胀土边坡稳定性分析[J].岩石力学与工程学报,23(增1):4478-4484.
谭龙,韦昌富,田慧会,等.2017土体持水特性及孔隙水分布特性的试验研究[J].工程地质学报,25(1):73-79.
谭文辉,璩世杰,高丹青,等.2010.降雨入渗对边坡稳定性的影响分析[J].武汉理工大学学报,32(15):39-43.
王睿,张嘎,张建民.2010.降雨条件下含软弱夹层土坡的离心模型试验研究[J].岩土工程学报,32(10):1582-1587.
王刚,孙萍,吴礼舟,等.2017.降雨诱发浅表层黄土滑坡机理实验研究[J].工程地质学报,25(5):1252-1263.
王协群,张有祥,邹维列,等.2010.降雨入渗条件下非饱和路堤变形与边坡的稳定数值模拟[J].岩土力学,31(11):3640-3645.
吴俊杰,王成华,李广信.2004.非饱和土基质吸力对边坡稳定的影响[J].岩土力学,25(5):732-736.
吴长富,朱向荣,尹小涛,等.2008.强降雨条件下土质边坡瞬态稳定性分析[J].岩土力学,29(2):386-391.
谢春庆,潘凯,廖崇高.等.2017.西南某机场高填方边坡滑塌机制分析与处理措施研究[J].工程地质学报,25(4):1083-1093.
熊勇林,朱合华,叶冠林,等.2017.降雨入渗引起非饱和土边坡破坏的水-土-气三相渗流-变形耦合有限元分析[J].岩土力学,38(1):284-290.
徐晗,朱以文,蔡元奇,等.2005.降雨入渗条件下非饱和土边坡稳定分析[J].岩土力学,26(12):1957-1962.
徐全,谭晓慧,沈梦芬.2012.降雨入渗条件下土质边坡的稳定性分析[J].岩土工程学报,34(增):254-259.
张硕,裴向军,黄润秋,等.2017.降雨诱发黄土高填方支挡边坡失稳机理研究[J].工程地质学报,25(4):1094-1104.