降雨和库水联合作用下边坡稳定性变化规律
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摘要
降雨与库水位骤降是影响边坡稳定性的重要因素。为研究不同类型降雨(平均型,前峰型,中峰型,后峰型)联合库水位骤降情况下某自拟边坡渗流特性以及稳定性的变化规律,利用Geostudio软件对不同类型降雨联合库水位骤降工况下的边坡渗流特性以及稳定性的变化规律进行了数值模拟,结果表明:库水位下降过程中孔压变化有一个"响应延迟"现象,且随着距离库岸距离的变大越来越明显;库水位下降速率越大,最小稳定系数出现的时间越早,最小稳定系数越小;在静库水位作用下不同类型降雨影响了最大孔压峰值的出现时间,前峰型最小稳定系数最大,后峰型最小稳定系数最小;不同时段降雨改变了孔压瞬时变化规律;平均型降雨,前峰型降雨,中峰型降雨最小稳定系数随着降雨发生时间的延后而越小,而后峰型降雨最小稳定系数出现在库水位下降过程中(10～20 d),且后峰型降雨容易导致边坡失稳。研究成果为不同类型降雨联合库水位骤降工况下边坡渗透稳定性规律提供了一个直观的认识。
Rainfall and sudden drop of reservoir water level are important factors affecting slope stability. In order to study the seepage characteristics and stability of a self-designed slope under the condition of sudden drop of water level of different types of rainfall( average type,front type,center front type,post-peak type)combined with reservoir water level drop. The seepage characteristics and stability of slope under the condition of sudden drop of water level in different types of rainfall combined reservoir are numerically simulated with Geostudio. Results show that: During the decline of reservoir water level,there is a phenomenon of "response delay",which is more and more obvious with the increase of distance from reservoir to shore. The bigger the decline rate of reservoir water level is,the earlier the minimum stability coefficient appears,and the smaller the minimum stability factor is. Under the action of static reservoir water level,different types of rainfall affect the time of the maximum peak pore pressure,the maximum minimum stability coefficient of the front type and the minimum stability coefficient of the posterior peak. The change rule of pore pressure is changed at different times; the average rainfall,forward rainfall,the minimum stable coefficient of center-front rainfall are smaller with the time of rainfall,and the minimum stable coefficient of peak-type rainfall appears in the decline of reservoir water level,and the post-peak rainfall can easily lead to slope instability. The research results provide an intuitive understanding of the seepage stability of slope under the condition of sudden drop of water level of different types of rainfall combined reservoir.
Rainfall and sudden drop of reservoir water level are important factors affecting slope stability. In order to study the seepage characteristics and stability of a self-designed slope under the condition of sudden drop of water level of different types of rainfall( average type,front type,center front type,post-peak type)combined with reservoir water level drop. The seepage characteristics and stability of slope under the condition of sudden drop of water level in different types of rainfall combined reservoir are numerically simulated with Geostudio. Results show that: During the decline of reservoir water level,there is a phenomenon of "response delay",which is more and more obvious with the increase of distance from reservoir to shore. The bigger the decline rate of reservoir water level is,the earlier the minimum stability coefficient appears,and the smaller the minimum stability factor is. Under the action of static reservoir water level,different types of rainfall affect the time of the maximum peak pore pressure,the maximum minimum stability coefficient of the front type and the minimum stability coefficient of the posterior peak. The change rule of pore pressure is changed at different times; the average rainfall,forward rainfall,the minimum stable coefficient of center-front rainfall are smaller with the time of rainfall,and the minimum stable coefficient of peak-type rainfall appears in the decline of reservoir water level,and the post-peak rainfall can easily lead to slope instability. The research results provide an intuitive understanding of the seepage stability of slope under the condition of sudden drop of water level of different types of rainfall combined reservoir.
引文
[1]徐永强,祁小博,张楠.基于降雨与库水位联合的三舟溪边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. Numerical simulation and stability analysis for the seepage flow in the Sanzhouxi landslide under the associative action of reservoir water level fluctuations and rainfall infiltration[J]. Hydrogeology&Engineering Geology,2016,43(5):111-118.
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[10]唐扬,殷坤龙,唐子珺.基于HYDRUS的三舟溪边坡降雨入渗规律研究[J].水文地质工程地质,2017,44(1):152-156+163.TANG Yang,YIN Kunlong,TANG Zijun,Research on the regulation of rain infiltration in the Sanzhouxi landslide based on HYDRUS[J]. Hydrogeology&Engineering Geology,2017,44(1):152-156+163.
[11]罗渝,何思明,何尽川.降雨类型对浅层边坡稳定性的影响[J].地球科学-中国地质大学学报,2014,39(9):1357-1363.LUO Yu, HE Siming, HE Jingchuan. Effect of rainfall patterns on stability of shallow landslide[J].Earth Science,2014,39(9):1357-1363.
[12]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 and slope stability analysis under different rainfall patterns based on fredlund&Xing parameters[J]. China Three Gorges Univ.(Natural Sciences),2017,39(6):46-51.
[13]雷德鑫,易武,柳青,等.三峡库区卧沙溪滑坡稳定性的可靠度及敏感性分析[J].安全与环境工程,2018,25(1):23-28.LEI Dexing,YI Wu,LIU Qing,et al. Reliability and sensitivity analysis of Woshaxi Landslide stability in Three Gorges Reservoir Area[J]. Safety and Environmental Engineering,2018,25(1):23-28.
[14] CALGARY,ALBERTA. GEO-SLOPE International Ltd. Seepage modeling with SEEP/W 2007.[M].Canada:Geo-Slope International Ltd.,2010.
[2]梁学战,陈洪凯.库水位升降条件下不同渗透性的边坡体稳定性变化规律[J].中国地质灾害与防治学报,2012,23(4):20-26.LIANG Xuezhan,CHEN Hongkai. Stability variation of landslide with different permeability coefficient following reservoir water level fluctuation[J]. The Chinese Journal of Geological Hazard and Control,2012,23(4):20-26.
[3]段祥宝,谢罗峰.水位降落条件下非稳定渗流试验研究[J].长江科学院院报,2009,26(10):7-12.DUAN Xiangbao,XIE Luofeng. Unsteady seepage test under condition of rapid drawdown[J]. Journal of Yangtze River Scientific Research Institute,2009,26(10):7-12.
[4]王俊杰,刘元雪.库水位等速上升中均质库岸塌岸现象及浸润线试验研究[J].岩土力学,2011,32(11):3231-3236.WANG Junjie,LIU Yuanxue. Experimental study of homogeneous bank caving and phreatic line during uniform rising water level[J]. Rock&Soil Mechanics,2011,32(11):3231-3236.
[5]卢博,郭永成,赵二平,等.库水位变化和降雨条件下边坡渗流特性及稳定性分析[J].三峡大学学报(自然科学版),2017,39(2):54-59.LU Bo,GUO Yongcheng, ZHAO Erping, et al.Analysis of seepage characteristics and stability of a slope under conditions of reservoir water level fluctuation and rainfall[J]. China Three Gorges Univ.(Natural Sciences),2017,39(2):54-59.
[6]纪东方.水位变化和降雨条件下的边坡稳定性分析[D].大连:大连理工大学,2016.JI Dongfang. Slope stability analysis water level change and rainfall[D]. Dalian:Dalian University of Technology,2016.
[7]李卓,何勇军,盛金保,等.降雨与库水位共同作用下近坝库岸边坡边坡模型试验研究[J].岩土工程学报,2017,39(3):452-459.LI Zhuo, HE Yongjun, SHENG Jinbao, et al.Landslide model for slope of reservoir bank under combined effects of rainfall and reservoir water level[J]. Chinese Journal of Geotechnical Engineering,2017,39(3):452-459.
[8]郭子正,殷坤龙,唐扬,等.库水位下降及降雨作用下麻柳林边坡稳定性评价与预测[J].地质科技情报,2017(4):260-265.GUO Zizheng,YIN Kunlong,TANG Yang,et al.Geological engineering risks and safety investment decision[J]. Geological Science&Technology Information,2017(4):260-265.
[9]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,et al.Sensitivity analysis on bank slope stability impacting factors under joint effect of reservoir water and rainfall[J]. Water Resources and Hydropower Engineering,2017,48(3):146-157.
[10]唐扬,殷坤龙,唐子珺.基于HYDRUS的三舟溪边坡降雨入渗规律研究[J].水文地质工程地质,2017,44(1):152-156+163.TANG Yang,YIN Kunlong,TANG Zijun,Research on the regulation of rain infiltration in the Sanzhouxi landslide based on HYDRUS[J]. Hydrogeology&Engineering Geology,2017,44(1):152-156+163.
[11]罗渝,何思明,何尽川.降雨类型对浅层边坡稳定性的影响[J].地球科学-中国地质大学学报,2014,39(9):1357-1363.LUO Yu, HE Siming, HE Jingchuan. Effect of rainfall patterns on stability of shallow landslide[J].Earth Science,2014,39(9):1357-1363.
[12]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 and slope stability analysis under different rainfall patterns based on fredlund&Xing parameters[J]. China Three Gorges Univ.(Natural Sciences),2017,39(6):46-51.
[13]雷德鑫,易武,柳青,等.三峡库区卧沙溪滑坡稳定性的可靠度及敏感性分析[J].安全与环境工程,2018,25(1):23-28.LEI Dexing,YI Wu,LIU Qing,et al. Reliability and sensitivity analysis of Woshaxi Landslide stability in Three Gorges Reservoir Area[J]. Safety and Environmental Engineering,2018,25(1):23-28.
[14] CALGARY,ALBERTA. GEO-SLOPE International Ltd. Seepage modeling with SEEP/W 2007.[M].Canada:Geo-Slope International Ltd.,2010.