摘要
为研究渗水导致露天矿坑内水位升高过程中,边坡岩体状态的变化特征,通过设置模拟场景并分析结果来确定岩体状态变化及其原因。分析了水位升高对边坡岩体可能造成的影响。根据矿区实际情况设置水位由-380 m升至20 m的9个均分模拟阶段,获得了每个阶段平衡时的岩体塑性区、位移和主应力情况,进而分析水位升高过程中的岩体状态变化。结果表明:水位升高对边坡岩体的塑性区影响最大,位移其次,主应力影响很小;水位上升使大高差边坡坡面的拉塑性区和位移增加;浸没岩体滑坡是下部滑坡体拖拽造成的;小高差边坡岩体水位升高过程中塑性区变化复杂,但对主应力的影响很小。研究可为露天矿长期渗水导致水位升高带来的灾害提供分析对照。
To study the change characteristics of slope rock mass state in the process of water seepage leading to the rise of water level in the open pit,the change of rock mass state and its causes are determined by setting simulation scenarios and analyzing the results.The possible influence of water level rise on slope rock mass is analyzed.The activation of water on rock mass includes the weakening of slope rock mass strength,the promotion of slope rock mass landslide,and the destruction of the stability of slope with the freeze-thaw cycle.According to the actual situation of the mining area,9 simulation stages of water level rising from-380 m to 20 m are set up,the plastic zone,displacement,and principal stress of rock mass in each stage are obtained,and then the change of rock mass state in the process of water level rise is analyzed.The results show that the rise of water level has the greatest influence on the plastic zone of slope rock mass,followed by displacement,and the influence of principal stress is very small.The rise of water level increases the tensile plastic zone and displacement of the slope with a large elevation difference;the landslide of submerged rock mass is caused by the drag of the lower landslide mass;the change of plastic zone of rock mass in small elevation difference slope is complex,but it has little effect on the principal stress.Water changes the physical and mechanical properties of joints,fissures,and faults in rock mass when it is immersed or infiltrated,and generally weakens these properties;The gravity of the rock mass acts on the bedrock through the pressure of water,and the additional pressure generated by the gravity of water on the bedrock is also limited.Therefore,in this case,the plastic zone and displacement of rock mass change obviously,while the stress change is relatively small.
作者
崔铁军
李莎莎
CUI Tiejun;LI Shasha(College of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,China;Institute of Safety and Emergency,Shenyang Ligong University,Shenyang 110159,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2023年第6期1817-1824,共8页
Journal of Safety and Environment
基金
国家自然科学基金项目(52004120)。
关键词
安全工程
矿山安全
露天矿
渗水
水位变化
岩体状态
safety engineering
mine safety
open pit mine
water seepage
water level change
rock mass state