矿山采洞位置对边坡稳定性的影响分析

矿山的采洞会对边坡稳定性产生有利或不利的影响，其中不利的影响可能会诱发如边坡失稳破坏等严重后果。本文建立了一系列概化边坡模型，采用基于连续介质的快速拉格朗日差分法，运用FLAC3D数值模拟软件在概化模型的不同位置进行洞室开挖模拟，分析了开挖后边坡的稳定性，总结了矿山采洞位置对边坡稳定性的影响规律。为进一步验证概化模型所得规律，以陕西山阳特大滑坡地质灾害为背景，建立实体模型并进行数值模拟。结果表明：当洞室开挖在坡肩位置时，边坡的稳定性较未开挖状态提高；当洞室开挖位置在坡面附近时，边坡的稳定性降低；当洞室开挖位置由坡面逐渐向边坡内部移动时，边坡的稳定性先降低后提高，尤其当洞室开挖在最危险滑动面附近时，边坡的稳定性最低。本文可作为矿山边坡安全釆洞活动的理论指导。

ANALYSIS ON THE INFLUENCE OF MINE CAVE LOCATION ON SLOPE STABILITY

The excavated in the mountain for a mining tunnel will have both advantages and disadvantages on the stability of the slope, and the adverse effects may lead to serious consequences such as failure of slope. In this paper, a series of generalized slope model is established. Based on the three dimensional fast Lagrangian analysis of continua, the numerical simulation software FLAC3D is used to simulate the excavation at different locations of the generalized model. The stability of the slope after excavation is analyzed, and the influence of mine location on slope stability is summarized. In order to verify the rule from the generalized model, the physical model is established and the numerical simulation is carried out with the background of the geological landslides disaster of Shanyang in Shaanxi Province. The results show that when the excavation is in the shoulder position, the slope is more stable than that without excavation. When the excavation position near the slope, the stability of the slope is reduced. When the excavation is gradually moved from the surface to the inside of the slope, the stability of the slope decreases first and then increases, especially when the excavation is near the most dangerous sliding surface, the slope has its lowest stability. This paper can be used as the theoretical guidance for the activity of mine slope safety.