基底积水和地表水入渗对富水区排土场稳定性的影响  

Stability of water-rich dump slope under the action of basement water retaining and surface water infiltration

作　　者：刘宝勇 包蕊 侯娇龙 赵宝友[3] LIU Baoyong;BAO Rui;HOU Jiaolong;ZHAO Baoyou(College of Environmental Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Kunming Coal Design and Research Institute,Kunming 650011,China;School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China)

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000 [2]昆明煤炭设计研究院,昆明650011 [3]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《安全与环境学报》2023年第8期2714-2721,共8页Journal of Safety and Environment

摘　　要：针对云南布沼坝露天煤矿新邓耳排土场工程场区富水性强的特点,采用有限元强度折减数值模拟方法,研究在基底积水、降雨和地表水入渗作用下,排土场的稳定性变化规律及失稳机制。结果表明:随基底积水水头的抬升或降雨、地表水入渗深度的增加,排土场安全系数以梯度0.013~0.015 m^(-1)近线性降低;在基底积水、降雨和地表水入渗共同作用下,排土场安全系数以梯度0.016~0.023 m^(-1)降低;在基底积水作用下排土场为上部坡体深部近圆弧滑移与下部坡体沿基底面滑动的失稳机制;在降雨和地表水入渗作用下为顺坡面浅层滑移的失稳机制;在基底积水、降雨和地表水共同作用时会出现上述2种破坏模式复合的失稳机制。According to the typical water-rich characteristics of Xindenger dump slope of Buzhaoba open pit coal mine in Yunnan,based on the finite element strength reduction principle,numerical models of XP1 and XP2 typical profiles of Xindenger dump slope were set up utilizing FLAC3D numerical simulation software.The stabilities and instability mechanism were deeply studied through dozens of numerical simulations under the action of basement water-retaining,and surface water seepage,separately.And the combined effects of water retaining and surface water seepage were also considered.The results show that the safety factor FS of the waste dump slope decreases nearly linearly with rising basement retaining water head H1 or increasing rainfall and surface water infiltration depth H2 at a gradient of 0.013-0.015 m^(-1).The functions between FS and H1,H2 are theoretically fitted for the Xindenger dump slope of XP1 and XP2 sections,separately.The safety factor FS of the waste dump slope decreases with a gradient of 0.016-0.023 m^(-1) under the combined action of basement water retaining,rainfall,and surface water infiltrating.When both the water head of basement water and the seepage depth of surface water are high,the safety factor FS of dump slope is dropped dramatically compared to that with the action of basement water retaining and surface water infiltrating,separately.The failure mechanism of the dump slope under the action of basement water is the circular sliding of the upper slope and sliding along the basement surface of the lower slope.And the failure mode is the shallow shear sliding with the action of rainfall or surface water infiltration.It is the combined instability mechanism of the above two failure modes when the basement water retaining,rainfall,and surface water infiltration act together.It can be seen that the stability of the Xindenger waste dump slope is significantly affected by basement water retaining,rainfall,and surface water infiltration.This study can provide theoretical support for the stability

关 键 词：安全工程 富水区 排土场 基底积水 地表水入渗 边坡失稳 

分 类 号：X936[环境科学与工程—安全科学]