Analysis on the slope stability of Fushun West Open-pit Mine under superimposed action of rainfall, mine and earthquake
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摘要:
夏季抚顺降雨频发且持续时间长，若遇上矿震，边坡极易失稳破坏。为分析雨季矿震作用对抚顺西露天矿的影响，采用极限平衡法整合渗流场，分析边坡稳定性。结果表明：相同雨强，持续时间越长，孔隙水压力等值线越密集，等值线闭合区域越多，边坡的安全系数越低；相同持时，雨强越大，孔隙水压力等值线图变化越快；降雨量相同，雨强越小雨水入渗影响的范围越大；加入水平矿震荷载系数后，随着矿震烈度增加，边坡安全系数降低。边坡降雨存在一个降雨临界值，降雨量未到达临界值时，边坡的安全系数下降缓慢，当到达临界值后，安全系数迅速下降。降雨和矿震对边坡安全影响极大，应当提前对边坡进行加固。
Abstract:In summer, the rainfall in Fushun occurs frequently and lasts for a long time. If there is a mine earthquake, the slope is very easy to be unstable and destroyed. The limit equilibrium method combined with the seepage field is used to analyze the slope stability, so that we can analyze the impact of mine earthquakes in the rainy season on the Fushun West Open-pit Mine.The results show that with the same rainfall intensity and the longer duration, the pore water pressure contour is denser, and the more closed areas of the contour are, the lower the safety factor of the slope is. At the same duration, the greater the rainfall intensity, the faster the pore water pressure contour map changes; Rainfall is the same, the smaller the rainfall intensity, the greater the range of rainfall infiltration; After adding the horizontal mine earthquake load factor, as the mine earthquake intensity increases, the slope safety factor decreases. There is a rainfall critical value for slope rainfall. When the rainfall does not reach the critical value, the safety factor of the slope decreases slowly, and when it reaches the critical value, the safety factor decreases rapidly. Rainfall and mine earthquake have a great impact on the safety of the slope, so the slope should be reinforced in advance.
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Key words:
- mine earthquake /
- rainfall /
- pore water pressure /
- load factor /
- safety factor
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表 1 岩层的基本物理参数
Table 1. Basic physical parameters of rock formation
岩层 杂填土 凝灰岩 玄武岩 渗透系数k/（m∙h−1） 10−2 5×10−3 8×10−7 黏聚力c/MPa 0.1 0.15 0.14 内摩擦角φ/（°） 20 39 42 密度ρ/（kg·m−3） 2000 2600 2800 
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表 3 水平矿震系数
Table 3. Horizontal mine seismic coefficient
矿震烈度 无 Ⅵ度 Ⅶ度 Ⅷ度 Ⅸ度 峰值加速度g 0 0.05 0.1 0.2 0.4 荷载系数 0 6.25×10−4 2.5×10−3 0.01 0.04
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表 5 A型雨强不同矿震载荷作用边坡安全系数
Table 5. Safety factors of slopes under different mine seismic loads of Type A rain intensities
工况 0 h 边坡稳定性状态 24 h 边坡稳定性状态 无 1.046 欠稳定 1.028 欠稳定 Ⅵ度 1.045 欠稳定 1.027 欠稳定 Ⅶ度 1.041 欠稳定 1.023 欠稳定 Ⅷ度 1.022 欠稳定 1.006 欠稳定 Ⅸ度 0.957 不稳定 0.943 不稳定
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