考虑降雨入渗-重分布的边坡稳定性分析
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摘要
为了阐述降雨对边坡稳定性的影响具有滞后性,提出了在降雨入渗过程中进行边坡稳定性分析时需考虑降雨入渗-重分布过程。在降雨入渗-重分布过程中,建立了基于GEOSTUDIO的边坡降雨入渗数值计算模型,研究了不同降雨强度对非饱和土质边坡稳定性的影响,并对比分析了在降雨强度和降雨持时相同条件下考虑与不考虑流固耦合时边坡稳定性变化规律。结果表明:不考虑流固耦合时,边坡安全系数随持续降雨逐渐变小,并在降雨结束后7~9h降至最低,之后安全系数逐渐增大,在降雨持时入渗及降雨结束后7~9h,边坡安全系数降低速率与降雨强度正相关;考虑流固耦合作用时,边坡的安全系数逐渐变小至趋于稳定,且始终不比考虑流固耦合时小。
In order to clarify that the influence of rainfall on the slope stability had the characteristic of lagging behind,it was proposed that the rainfall infiltration-redistribution process should be considered for analyzing the slope stability in the rainfall infiltration process.During the process of the rainfall infiltration-redistribution,the numerical model of rainfall infiltration based on GEOSTUDIO was established,and the influences of different rainfall intensities on the stability of unsaturated soil slope were studied.Moreover,the variation laws of slope stability under considering and not considering the fluid-solid coupling were compared and analyzed in the same rainfall intensity and time.The results showed that the safety factor of the slope without considering the effect of fluid-solid coupling,decreased with the continuous rainfall,and 7~9 hours after the end of the rainfall,it would bottom out and then gradually increased.And during the period of rainfall inflow and 7~9 hours after the end of rainfall,the decreasing speed of the slope safety factor had a positive correlation with the increasing of rainfall intensity.Considering the effect of fluid-solid coupling,the safety factor of the slope gradually became smaller and tended to be stable,and was always smaller than that of not considering the fluid-solid coupling.
In order to clarify that the influence of rainfall on the slope stability had the characteristic of lagging behind,it was proposed that the rainfall infiltration-redistribution process should be considered for analyzing the slope stability in the rainfall infiltration process.During the process of the rainfall infiltration-redistribution,the numerical model of rainfall infiltration based on GEOSTUDIO was established,and the influences of different rainfall intensities on the stability of unsaturated soil slope were studied.Moreover,the variation laws of slope stability under considering and not considering the fluid-solid coupling were compared and analyzed in the same rainfall intensity and time.The results showed that the safety factor of the slope without considering the effect of fluid-solid coupling,decreased with the continuous rainfall,and 7~9 hours after the end of the rainfall,it would bottom out and then gradually increased.And during the period of rainfall inflow and 7~9 hours after the end of rainfall,the decreasing speed of the slope safety factor had a positive correlation with the increasing of rainfall intensity.Considering the effect of fluid-solid coupling,the safety factor of the slope gradually became smaller and tended to be stable,and was always smaller than that of not considering the fluid-solid coupling.
引文
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[21]Lu N,Godt J W.Hillslope hydrology and stability[J].Canadian Water Resources Journal,2011,40(1).
[2]张杰,韩同春,豆红强,等.探讨变雨强条件下的入渗过程及影响因素[J].岩土力学,2014(S1):451-456.
[3]张国炳,袁俊平,张立伟.考虑降雨对土体强度影响的公路高边坡稳定分析[J].公路,2005(9):106-110.
[4]王一兆,隋耀华.降雨入渗对边坡浅层稳定性的影响[J].长江科学院院报,2017,34(4):122-125.
[5]吴仁铣.降雨诱发的滑坡作用机制研究[D].长沙:中南大学,2013.
[6]张玲,黄敬峰,王深法,等.基于GIS的滑坡临界降雨指标的研究[J].浙江大学学报:农业与生命科学版,2003,29(5):493-498.
[7]殷坤龙.滑坡灾害预测预报[M].武汉:中国地质大学出版社,2004:25-47.
[8]朱文彬,刘宝琛.降雨条件下土体滑坡的有限元数值分析[J].岩石力学与工程学报,2002,21(4):409-512.
[9]Guzzetti F,Peruccacci S,Rossi M,et al.Rainfall thresholds for the initiation of landslides in Central and Southern Europe[J].Meteorology and Atmospheric Physics,2007,98(3):239-267.
[10]Smith F.The role of rainfall in the landslide hazard:the case of the Avigliano urban area(Southern Apennines,Italy)[J].Engineering Geology,1999,53(3-4):297-309.
[11]RAHARDJO H,ONG T H,REZAUR R B.Factors controlling instability of homogeneous soil slopes under rainfall[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(12):1532-1543.
[12]李悼芬,陈虹.雨水渗透与香港滑坡灾害[J].水文地质工程地质,1997(4):34-38.
[13]杨晓杰,侯定贵,郝振立,等.南芬露天铁矿高陡边坡失稳与降雨相关性研究[J].岩石力学与工程学报,2016(S1):3232-3240.
[14]Travis Q B,Houston S L,Marinho F A M,et al.Unsaturated Infinite Slope Stability Considering Surface Flux Conditions[J].Journal of Geotechnical&Geoenvironmental Engineering,2010,136(7):963-974.
[15]徐晗,朱以文,蔡元奇,等.降雨入渗条件下非饱和土边坡稳定分析[J].岩土力学,2005,26(12):1957-1962.
[16]李宏伟.降雨入渗条件下土质边坡非饱和渗流二维数值分析[J].水资源与水工程学报,2010,21(6):133-136.
[17]杨昊庆,张璐璐,郑文棠,等.降雨入渗条件下分层非饱和土质边坡随机反分析[J].武汉大学学报(工学版),2016,49(5):641-647.
[18]豆红强.降雨入渗-重分布下土质边坡稳定性研究[D].杭州:浙江大学,2015.
[19]杨永恒.渗流场与应力场耦合分析及其在尾矿坝工程中的应用[D].西安:西安理工大学,2006.
[20]李纪伟.降雨入渗作用下非饱和土渗流场与应力场耦合分析[D].武汉:华中科技大学,2011.
[21]Lu N,Godt J W.Hillslope hydrology and stability[J].Canadian Water Resources Journal,2011,40(1).