蒸发蒸腾对边坡渗流及稳定性的影响研究  

Study on the effect of evaporation and transpiration on seepage and stability of slope

作　　者：盛建龙[1,2] 马陆江 SHENG Jianlong;MA Lujiang(Academy of Resource and Environmental Engineering,Wuhan University of Science and Technology.Wuhan Hubei 430081.China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgical Mineral Resources,Wuhan Hubei 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《化工矿物与加工》2020年第7期1-5,共5页Industrial Minerals & Processing

摘　　要：基于某矿山排土场与真实的气候数据,利用GeoStudio建立温湿耦合有限元计算模型,研究蒸发蒸腾作用对边坡渗流场与稳定性的影响。结果表明:土体含水量随降雨不断入渗而逐渐提高,随蒸发蒸腾的进行而逐渐降低;降雨量越大,土的含水量变化范围也越大,且随着深度的增加,含水量变化范围不断减小,对气候的响应也愈发滞后;降雨强度较大时,蒸散作用下雨水浸润区的含水量高于无蒸散时的含水量,这可能与阻滞效应有关;降雨强度较小时,蒸散作用下浸润区的含水量低于无蒸散时的含水量,这可能是阻滞效应不明显且蒸发造成了入渗量的减少所致;植被通过冠层截留雨水以及蒸腾加速了土体水分的耗散,从而降低土体的含水量,有利于边坡稳定。降雨入渗提高了土体含水量,削弱了边坡稳定性,而蒸发蒸腾则降低了土体含水量,有利于边坡稳定。Based on the waste dump of a mine and real climate data,a temperature humidity coupled finite element model is established by using GeoStudio to study the influence of evaporation and transpiration on the seepage field and stability of slope.The results show that the moisture in soil increases with rainfall infiltration into soil and decreases with evaporation and transpiration proceed.The larger the rainfall is,the larger the change range of soil moisture becomes.With the increase of soil depth,the range of soil moisture change is getting smaller,and the response to climate is lagging behind.When the rainfall intensity is high,the water content in the rainwater infiltration area under evapotranspiration is higher than that in absence of evapotranspiration,which may be contributed to the retardation effect;When the rainfall intensity is low,the water content in the infiltration area under evapotranspiration is lower than that in absence of evapotranspiration,which may be due to nonobvious retardation effect,and the evaporation resulting in the decrease of infiltration.Rain water interception by vegetation and transpiration to accelerate moisture escaped from soil reduce the moisture in soil,which is helpful for the stability of slope.Rainfall infiltration increases the soil moisture and makes the slope stability weakened,while evaporation and transpiration lead to lower soil moisture content,and have the slope stability improved.

关 键 词：排土场边坡 边坡渗流 湿热耦合 蒸发蒸腾 边坡稳定性 含水量 降雨强度 

分 类 号：TU43[建筑科学—岩土工程]