为了实现节地减损开采技术在露天矿的安全应用，对开采过程中的边坡结构、岩体应力状态和稳定性进行分析，揭示开采程序和参数与边坡应力分布和稳定性的耦合规律。采用剖面法阐述了适用于扩建和新建露天矿的2种节地减损开采技术方案;分析了边坡内部的应力类型，建立了降段或靠帮开采造成的不平衡应力分异模型及其诱发的边坡牵引式渐进破坏模型。以蒙东地区露天矿采场端帮的形成和发展过程为依据建立了三维模型，并设定模拟条件如下:采场深度从0降段至300 m，每次降段50 m;端帮角度从37°线性提高至45°，每次提高2°;内排土场从0回填至300 m，每次回填50 m。分析得到开挖降段和靠帮开采过程中自重应力和水平应力变化规律以及开挖降段和内排回填过程中的端帮边坡稳定系数变化规律。根据矿山的设备生产能力和采剥工程量，计算出开挖降段、靠帮开采所需的工程时间，通过回归分析得到自重和水平应力随时间的变化规律，以及时效稳定性的变化规律。研究结果表明:开挖降段过程中，自重和水平应力分别下降了1.6和5.6 MPa，端帮边坡稳定系数从2.23下降到0.83;靠帮开采过程中，自重和水平应力分别提高了0.5和9.4 MPa;内排回填过程中，端帮稳定系数从0.83提高到1.87。自重应力和水平应力均呈现以采场中心线为轴的对称结构，在采场范围内，自重应力呈拱形结构，水平应力呈“楔形”结构;随着开挖降段深度或端帮边坡角度的增大，自重应力拱顶曲率和水平应力楔形曲率均不断减小。自重和水平应力的峰值随开挖深度的增大呈二次函数下降，随开挖时间的增加均呈线性规律下降，随端帮边坡角度的增大呈二次函数规律增大。端帮稳定系数随开挖降段深度的增加呈负指数降低，随时间的增长呈二次函数规律下降;端帮的稳定系数随内排回填高度、时间均呈现指数的增长规律。

In order to realize the safety application of the land-reducing and ecological detraction mining technology in open pit mines,the slope structure,rock stress state and slope stability during the mining process are analyzed. The coupling law between the mining program,parameters,the stress distribution and stability of the slope is revealed. In this paper,two kinds of land-reducing and ecological detraction mining technology schemes suitable for expansion and new construction of open-pit mines are described by using the section method. The type of stress inside the slope is an- alyzed,the unbalanced stress differentiation model caused by deepening excavation or steep mining and the induced progressive failure model of the slope are established. Based on the development process of the open-pit mine end- slope in the eastern of Inner Mongolia,a three-dimensional model was established,and the simulation conditions were set as follows:the depth of the stope is from 0 m to 300 m,and the depth increases by 50 m each time;the end-slope angle was linear increased from 37° to 45°,and increases by 2° each time;the height of internal dumping is from 0 m to 300 m,and increases by 50 m each time. The variation law of the self-weight and horizontal stress during the deepe- ning excavation and steep mining process,and the variation law of the stability coefficient of end-slope during the deepening excavation and the internal dumping process are analyzed. According to the equipment production capacity of the mine and the amount of mining and stripping engineering,the engineering time required for deepening excava- tion and steep mining is calculated. The variation law of self-weight and horizontal stress with time length and the vari- ation law of time-dependent stability of end-slope are obtained through regression analysis. The results show that the self-weight and horizontal stress decrease by 1. 6 MPa and 5. 6 MPa respectively during the deepening excavation process,and the stability coefficient of the end-slope decreases from 2. 23 to 0. 83. During the steep mining process, the self-weight and horizontal stress are increased by 0. 5 MPa and 9. 4 MPa respectively. During the internal dumping process,the stability factor of end-slope increased from 0. 83 to 1. 87. Both the self-weight and the horizontal stress show a symmetrical structure with the centerline of the stope as the axis. In the stope range,the structure of self-weight stress is arched and the horizontal stress is “wedge-shaped”. With the increases of excavation depth or slope angle,the self-weight stress dome curvature and the horizontal stress wedge curvature decrease continuously. The peak value of self-weight and horizontal stress decreases with the increase of excavation depth as a quadratic function,and decreases linearly with the increase of excavation time length,which also increase with the increase of end-slope angle as quad- ratic function. The stability coefficient of the end-slope decreases with the increase of the excavation depth,and decrea- ses with the increase of time,while it increases exponentially with the change of the internal dump height and the time length.