雨水重分布下排土场边坡稳定性可靠度分析
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摘要
为了探究降雨诱发的滑坡具有滞后性的原因,基于饱和-非饱和渗流理论,建立了排土场边坡雨水重分布数值模型,结合可靠度分析方法,研究了排土场边坡在降雨过程中以及结束后一段时间的稳定性。结果表明:前期降雨强度对雨水入渗过程有重要的影响,前期降雨越大,降雨入渗到土壤中的雨水越多,边坡稳定性降低得越快;在降雨结束后雨水重分布过程中,排土场边坡的稳定性先降低后逐渐趋于稳定,可以解释降雨时滑坡的发生具有滞后性的原因;排土场边坡的稳定性变化规律与湿润锋下移的深度和速率的特性基本一致,故可用湿润锋下移的深度和速率作为衡量边坡稳定性变化的重要指标之一。
In order to study the reasons for the hysteresis of rainfall-induced landslides,based on the saturated-unsaturated seepage theory,a numerical model of rainfall redistribution on the slope of the dump was established.Combined with the reliability analysis method,the stability of dump slope in the process of rainfall and for a period of time after its end was studied.The results show that the rainfall intensity in the early stage has an important influence on the infiltration process of rainwater.The larger the rainfall in the early stage is,the more the rainfall infiltrates into the soil,and the faster the slope stability decreases.In the process of rain water redistribution after the end of rainfall,the slope stability of the dump decreases first and then gradually tends to be stable,which can explain why the occurrence of landslide has hysteresis during rainfall.The change rule of slope stability of the dump is basically consistent with the characteristics of the depth and rate of the wetting front moving down,so the depth and rate of the wetting front moving down can be used as one of the important indexes to measure the change of slope stability.
In order to study the reasons for the hysteresis of rainfall-induced landslides,based on the saturated-unsaturated seepage theory,a numerical model of rainfall redistribution on the slope of the dump was established.Combined with the reliability analysis method,the stability of dump slope in the process of rainfall and for a period of time after its end was studied.The results show that the rainfall intensity in the early stage has an important influence on the infiltration process of rainwater.The larger the rainfall in the early stage is,the more the rainfall infiltrates into the soil,and the faster the slope stability decreases.In the process of rain water redistribution after the end of rainfall,the slope stability of the dump decreases first and then gradually tends to be stable,which can explain why the occurrence of landslide has hysteresis during rainfall.The change rule of slope stability of the dump is basically consistent with the characteristics of the depth and rate of the wetting front moving down,so the depth and rate of the wetting front moving down can be used as one of the important indexes to measure the change of slope stability.
引文
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[2]董舒,盛建龙,杨明财,等.降雨作用下露天矿边坡流固耦合稳定性分析[J].化工矿物与加工,2018,47(2):31-35.
[3]黄强,程勇刚,周伟,等.降雨入渗下非饱和土质边坡稳定性的最小势能法研究[J].中国农村水利水电,2018(1):154-160.
[4]翁新海,王家鹏.降雨入渗对非饱和边坡稳定性影响分析研究[J].科技通报,2018,34(2):188-191.
[5]杨秀竹,叶志凌,雷金山,等.降雨入渗条件下矿坑边坡稳定性分析[J].铁道科学与工程学报,2017,14(5):935-941.
[6]田华,吴榕真,韩流,等.排土场内隔水层高度对边坡稳定性的影响研究[J].化工矿物与加工,2018,47(4):46-49.
[7]陈爽,李新鹏,韩流,等.基于CAD二次开发的边坡稳定性分析程序研究[J].化工矿物与加工,2017,46(8):41-44.
[8]李炎隆,陈波,马成成,等.基于ABAQUS的降雨入渗条件下基坑边坡稳定性分析[J].应用力学学报,2017,34(1):155-161.
[9]张立博,秦哲,付厚利,等.强降雨对高陡岩质边坡稳定性的影响分析[J].金属矿山,2017(8):165-169.
[10]Peter Jordan.Hillslope hydrology and stability[J].Canadian Water Resources Journal/Revue canadienne des ressources hydriques,2015,40(1):126-127.
[11]陈鹏,陈鹏飞.露天矿排土场边坡稳定性分析[J].辽宁工程技术大学学报(自然科学版),2010,29(6):1 028-1 031.
[12]王瑜,罗英嘉,赵俊英.排土场边坡整体稳定性的极限平衡法计算与可靠度分析[J].盐城工学院学报(自然科学版),2018,31(1):52-56.
[13]张亚宾,陈超,甘德清.降雨对排土场边坡渗流及稳定性的影响[J].金属矿山,2016(5):173-177.
[14]钟彩彩.基于渗流-应力耦合作用的排土场稳定性分析[D].昆明:昆明理工大学,2017.
[15]高昂,苏怀智.基于BP网络和Monte Carlo法相结合的堤防渗流稳定可靠度分析[J].中国农村水利水电,2014(6):161-163.
[16]王锋.Kriging法在饱和-非饱和土石坝坝坡稳定可靠度分析中的应用研究[D].南昌:南昌大学,2016.
[17]唐栋,李典庆,周创兵,等.考虑前期降雨过程的边坡稳定性分析[J].岩土力学,2013,34(11):3 239-3 248.
[18]黄涛,盛建龙,翟明洋.考虑降雨入渗-重分布的边坡稳定性分析[J].矿业研究与开发,2018,38(2):35-39.
[19]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.