摘要
为定量研究降雨条件下边坡不同非饱和参数对边坡的渗透稳定性影响大小,根据Fredlund&Xing非饱和计算原理,利用Geostudio软件对某边坡在不同非饱和参数下的渗透稳定性进行数值模拟,同时基于灰色关联度理论进行敏感性分析,结果表明:(1)上下监测点孔压随时间呈现在降雨时迅速增大在降雨缓慢减小的趋势,且在同一工况下,整体上下部监测点的孔压大于上部监测点的孔压;(2)边坡安全系数在降雨时迅速下降、停雨后缓慢下降,而且参数a越大,整体安全系数越大,但是当a=40 k Pa时整体安全系数有一个突然的陡降;参数m、n、k越大,整体安全系数也越大;(3)灰关联度敏感性大小排序为a>n>m>k。研究结果为定量化认识不同非饱和参数下的边坡渗透稳定性规律提供了一定的参考。
In order to quantitatively study the influence of different unsaturated parameters on the seepage stability of slope under rainfall condition,according to the principle of Fredlund&Xing unsaturated calculation,The seepage stability of a slope under different unsaturated parameters is numerically simulated by using Geostudio software,and the sensitivity analysis is carried out based on the grey correlation degree theory.The results show that:( 1) under rainfall conditions,the pore pressure of the upper monitoring point increases rapidly with rainfall,but decreases slowly at the end of the rainfall,while the pore pressure of the lower monitoring point increases rapidly at the time of rainfall.And slow down at the end of the rain.For the same working condition,the pore pressure of the lower monitoring point is larger than that of the upper monitoring point.( 2) the slope safety factor decreases rapidly during rainfall,but slowly decreases after stopping rain.The larger the parameter a,the greater the overall safety factor,but when a = 40 k Pa,the overall safety factor has a sudden and steep decline.( 3) the sensitivity of different unsaturated parameters on slope permeability stability is analyzed,and the order of sensitivity of grey correlation degree is a > n > m > k.The results of the study are quantitative in recognition of different unsaturated parameters.The seepage stability rule of the slope based on the above mentioned method provides a certain reference.
引文
[1]黄龙波,汪洪星,谈云志,等.降雨对岩土边坡稳定影响的实例分析[J].三峡大学学报(自然科学版),2016,38(4):40-45.Huang Longbo,Wang Hongxing,Tan Yunzhi,et al.An example analysis of the influence of rainfall on the stability of rock and soil slope[J].Journal of three Gorges University(Natural Science Edition),2016,38(4):40-45.
[2]黄景华,陈朝晖,秦文涛.降雨条件下二维边坡稳定可靠性分析[J].福州大学学报(自然科学版),2017,45(4):501-507.Huang Jinghua,Chen Zhaohui,Qin Wentao.Stability and reliability analysis of two-dimensional slope under rainfall[J].Journal of Fuzhou University(Natural Science Edition),2017,45(4):501-507.
[3]乔兰,姜波,庞林祥,等.降雨入渗对板岩边坡稳定的影响及加固措施研究[J].岩土力学,2015,36(S2):545-550.Qiao Lan,Jiang Bo,Pang Linxiang,et al.Study on the influence of rainfall infiltration on the stability of slate slope and the reinforcement measures[J].Geotechnical Mechanics,2015,36(S2):545-550.
[4]马世国,韩同春,徐日庆,等.强降雨条件下含倾斜基岩层的边坡稳定分析[J].中南大学学报(自然科学版),2015,46(7):2673-2678.Ma Shiguo,Han Tongchun,Xu Riqing,et al.Slope stability analysis with inclined bedrock under heavy rainfall[J].Journal of Central South University(Natural Science Edition),2015,46(7):2673-2678.
[5]徐永强,祁小博,张楠.基于降雨与库水位联合的三舟溪滑坡渗流模拟及稳定性分析[J].水文地质工程地质,2016,43(5):111-118.Xu Yongqiang,Qi Xiaobo,Zhang Nan.Seepage simulation and stability analysis of Sanzhouxi landslide based on rainfall and reservoir water level[J].Hydrogeology,Engineering Geology,2016,43(5):111-118.
[6]朱朋,卢书强,薛聪聪,等.库水位升降与降雨条件下滑坡的渗流及稳定性分析[J].长江科学院院报,2015,32(11):87-92.Zhu Peng,Lu Shuqiang,Xue Congcong,et al.Seepage and stability analysis of landslide under reservoir water level rise and fall and rainfall[J].Proceedings of the Yangtze Academy of Sciences,2015,32(11):87-92.
[7]周永强,盛谦.库水位变化和降雨作用下付家坪子高陡滑坡稳定性研究[J].长江科学院院报,2014,31(2):57-61.Zhou Yongqiang,Sheng Qian.Study on stability of Fujiapingzi high-steep landslide under the action of reservoir water level variation and rainfall[J].Proceedings of the Yangtze Academy of Sciences,2014,31(2):57-61.
[8]方景成,邓华锋,肖瑶,等.库水和降雨联合作用下岸坡稳定影响因素敏感性分析[J].水利水电技术,2017,48(3):146-152.Fang Jingcheng,Deng Huafeng,Xiao Yao,etc.Sensitivity analysis of influencing factors of bank slope stability under the combined action of reservoir water and rainfall[J].Water Conservancy and Hydropower Technology,2017,48(3):146-152.
[9]张国栋,李泯蒂,龙海涛,等.水库型滑坡稳定性动态变化过程有限元分析[J].水利水电技术,2016,47(2):104-109.Zhang Guodong,Li Yanti,long Haitao,et al.Finite element analysis of dynamic variation process of reservoir landslide stability[J].Water Conservancy and Hydropower Technology,2016,47(2):104-109.
[10]徐永强,祁小博,张楠.基于降雨与库水位联合的三舟溪滑坡渗流模拟及稳定性分析[J].水文地质工程地质,2016,43(5):111-118.Xu Yongqiang,Qi Xiaobo,Zhang Nan.Seepage simulation and stability analysis of Sanzhouxi landslide based on rainfall and reservoir water level[J].Hydrogeology,Engineering Geology,2016,43(5):111-118.
[11]杨攀,杨军.考虑前期降雨的边坡稳定降雨阈值曲面[J].岩土力学,2015,36(S1):169-174.Yang Pan,Yang Jun.Slope stable rainfall threshold surface considering forepart rainfall[J].Geotechnical Mechanics,2015,36(S1):169-174.
[12]顾成壮,胡卸文,张茂淳,等.强降雨下饱和平滑型滑坡坡体水流运动及其边坡稳定效应分析---以四川汉源二蛮山滑坡为例[J].岩土力学,2013,34(04):1075-1081.Gu Chengzhuang,Hu Xianwen,Zhang Maochun,et al.A-nalysis of flow movement and slope stability effect of saturated smooth landslide under heavy rainfall-A case study of Ermashan landslide in Hanyuan,Sichuan[J].Geotechnical Mechanics,2013,34(04):1075-1081.
[13]郭爱斌,万智.考虑降雨入渗的非饱和边坡稳定分析[J].公路工程,2010,35(3):119-122.Guo Aibin,Wan Zhi.Stability analysis of unsaturated slope considering rainfall infiltration[J].Road works,2010,35(3):119-122.
[14]张磊,张璐璐,程演,等.考虑潜蚀影响的降雨入渗边坡稳定性分析[J].岩土工程学报,2014,36(9):1680-1687.Zhang Lei,Zhang Lulu,Cheng Yan,et al.Stability analysis of rainfall infiltration slope considering potential erosion[J].Journal of Geotechnical Engineering,2014,36(9):1680-1687.
[15]郁舒阳,张继勋,王军磊,等.基于Fredlund&Xing参数下不同雨型边坡渗透稳定性分析[J].三峡大学学报(自然科学版),2017,39(6):46-51.Yu Shuyang,Zhang Jixun,Wang Junlei,et al.Seepage stability analysis of slope with different rain types based on Fredlund&Xing parameters[J].Journal of the three Gorges University(Natural Science Edition),2017,39(6):46-51.
[16]Fredlund D G,Xing A.Equations for the soil-water characteristic curve[J].Canadian Geotechnical Journal,1994,31(4):521-532.
[17]王曙钊,刘兴堂,段锁力.利用灰色关联度理论对仿真模型的评估研究[J].空军工程大学学报(自然科学版),2007,8(1):73-76.Wang Shuzhao,Liu Xingtang,Duan Suoli.A study on the evaluation of the simulation model by using the theory of grey relational degree[J].Journal of Air Force Engineering University(Natural Science Edition),2007,8(1):73-76.
