不同降雨强度条件下排土场边坡渗流可靠度研究
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摘要
结合GEOSTUDIO软件的渗流有限元法和蒙特卡洛法,建立了不同降雨强度条件下某矿山排土场边坡渗流可靠度计算模型。采用Van Genuchten模型估算排土场边坡的水土特征曲线和渗透系数函数,计算了矿山排土场边坡在天然状态下最危险滑面上边坡的安全系数,研究了降雨入渗作用下排土场边坡稳定性和可靠度的时程变化规律以及不同降雨强度对排土场边坡稳定性和可靠度的影响。研究结果表明:随着降雨强度的增大,排土场边坡体内的浸水面深度不断增加,孔隙水压力增大,安全稳定性系数逐渐降低,边坡趋于失稳。
Combined with the seepage finite element method and Monte Carlo method of GEOSTUDIO software,the slope seepage reliability calculation model of a mine dumping site under different rainfall intensity conditions was established.The Van Genuchten model was used to estimate the soil and water characteristic curve and the permeability coefficient function of the slope of the dumping site,and the safety coefficient of the most dangerous sliding surface slope under the natural state of the mine dumping site was calculated.The time history variation rule of the slope stability and reliability of the dumping site under rainfall infiltration and the influence of different rainfall intensity on the slope stability and reliability of the dumping site were studied.The results show that with the increase of rainfall intensity,the depth of water surface in the slope of the dump increases,the pressure of pore water increases,the coefficient of safety and stability decreases gradually,and the slope tends to be unstable.
Combined with the seepage finite element method and Monte Carlo method of GEOSTUDIO software,the slope seepage reliability calculation model of a mine dumping site under different rainfall intensity conditions was established.The Van Genuchten model was used to estimate the soil and water characteristic curve and the permeability coefficient function of the slope of the dumping site,and the safety coefficient of the most dangerous sliding surface slope under the natural state of the mine dumping site was calculated.The time history variation rule of the slope stability and reliability of the dumping site under rainfall infiltration and the influence of different rainfall intensity on the slope stability and reliability of the dumping site were studied.The results show that with the increase of rainfall intensity,the depth of water surface in the slope of the dump increases,the pressure of pore water increases,the coefficient of safety and stability decreases gradually,and the slope tends to be unstable.
引文
[1]王运敏.排土场稳定性及灾害防治[M].北京:冶金工业出版社,2011.
[1]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.
[2]LL Z,LM Z,WH T.Rainfall-induced slope failure considering variability of soil properties[J].Géotechnique,2005,55(2):183-188.
[3]G K,L V.Identification of mechanisms for landslide type initiation of debris flows[J].Engineering Geology,2009,109(1):114-123.
[4]黄鑫,张晓辉,薛雷,等.陕西省金堆城露天矿排土场高边坡稳定性评价[J].中国地质灾害与防治学报,2010,21(2):40-43.
[5]Ashutosh Kainthola.A coal mine dump stability analysis---a case study[J].Geomaterials,2011,1(1):1-13.
[6]RADHAKANTA K,DEBASHISH C.Discrete element approach for mine dump stability analysis[J].Mining Science and Technology,2010,20(6):809-813.
[7]张鲲华,陈玉明,张绍周.某露天矿排土场边坡稳定性分析[J].中国非金属矿工业导刊,2014(5):59-62.
[8]张涛,马宁,陈庆丰,等.弓长岭露天铁矿大阳沟排土场边坡稳定性分析[J].金属矿山,2013,42(9):6-9.
[9]宋子岭,刘文坊,范军富,等.倾斜基底内排土场边坡稳定性分析[J].金属矿山,2018,47(2):179-183.
[10]李跃,杨永生,毛权生,等.基于三维地质模型的排土场边坡整体稳定性探究[J].岩土力学,2013,34(S1):533-539.
[11]文章,刘凯,陈晓恋.承压含水层中非完整井附近“非达西-达西”两区渗流模型近似解析解[J].地球科学(中国地质大学学报),2015,40(5):918-924.
[12]刘洁.考虑非饱和土体的粘土心墙坝非稳定渗流分析[D].济南:山东大学,2010.
[13]李俊业,唐红梅,陈洪凯,等.考虑饱和-非饱和渗流作用的重庆奉节鹤峰乡场镇滑坡稳定性分析[J].中国地质灾害与防治学报,2010,21(4):1-7.
[14]刘博.库水下降条件下土体渗流对边坡稳定性的影响研究[D].长沙:中南大学,2014.
[1]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.
[2]LL Z,LM Z,WH T.Rainfall-induced slope failure considering variability of soil properties[J].Géotechnique,2005,55(2):183-188.
[3]G K,L V.Identification of mechanisms for landslide type initiation of debris flows[J].Engineering Geology,2009,109(1):114-123.
[4]黄鑫,张晓辉,薛雷,等.陕西省金堆城露天矿排土场高边坡稳定性评价[J].中国地质灾害与防治学报,2010,21(2):40-43.
[5]Ashutosh Kainthola.A coal mine dump stability analysis---a case study[J].Geomaterials,2011,1(1):1-13.
[6]RADHAKANTA K,DEBASHISH C.Discrete element approach for mine dump stability analysis[J].Mining Science and Technology,2010,20(6):809-813.
[7]张鲲华,陈玉明,张绍周.某露天矿排土场边坡稳定性分析[J].中国非金属矿工业导刊,2014(5):59-62.
[8]张涛,马宁,陈庆丰,等.弓长岭露天铁矿大阳沟排土场边坡稳定性分析[J].金属矿山,2013,42(9):6-9.
[9]宋子岭,刘文坊,范军富,等.倾斜基底内排土场边坡稳定性分析[J].金属矿山,2018,47(2):179-183.
[10]李跃,杨永生,毛权生,等.基于三维地质模型的排土场边坡整体稳定性探究[J].岩土力学,2013,34(S1):533-539.
[11]文章,刘凯,陈晓恋.承压含水层中非完整井附近“非达西-达西”两区渗流模型近似解析解[J].地球科学(中国地质大学学报),2015,40(5):918-924.
[12]刘洁.考虑非饱和土体的粘土心墙坝非稳定渗流分析[D].济南:山东大学,2010.
[13]李俊业,唐红梅,陈洪凯,等.考虑饱和-非饱和渗流作用的重庆奉节鹤峰乡场镇滑坡稳定性分析[J].中国地质灾害与防治学报,2010,21(4):1-7.
[14]刘博.库水下降条件下土体渗流对边坡稳定性的影响研究[D].长沙:中南大学,2014.