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大冶铁矿东露天采场二区滑坡群位于F25断裂滑脱带内,属人工开采形成的高陡岩质边坡。断裂带内闪长岩和铁矿石被破碎成典型的角砾岩和碎粉岩,节理发育程度较高。滑坡群由3个主滑体及若干碎裂岩土体组成,平面平均长度约138m,平均宽度约120m,高差约85m,整体坡度约36°,总体积约1.1×107m3,下伏基岩为粉砂质泥岩,滑体组成物质为粉质粘土夹碎石块。运用自然历史分析法和工程地质类比法讨论了滑坡的破坏机理,认为该滑坡群的形成和发展是岩土类型和性质、岩体结构及地质构造、地形地貌、水、诱发因素等综合作用的结果。运用极限平衡方法对其中一典型滑坡在现状、暴雨、爆破及暴雨爆破联合作用4种工况下的稳定性进行综合分析和评价,所得稳定性系数分别为1.256、0.961、1.198、0.954,计算结果表明降雨是控制该滑坡稳定性的主要外因。针对该滑坡的实际情况,提出了避免采用抗滑桩加固、避免暴雨时地下爆破作业、在滑坡后壁及坡面上设置截水沟和排水沟、水泥砂浆嵌缝、减荷反压及坡面绿化等防治方案建议。
The Second Landslide Group, located in the east open pit of Daye Iron Mine, is located in the F25 fault slip zone and is a high-steep rock slope formed by artificial mining. In the fault zone, the diorite and iron ore are crushed into typical breccias and breccias, and the joints have a high degree of development. The landslide group consists of three main bodies and several fragments of rock mass. The average plane length is about 138m, the average width is about 120m, the height difference is about 85m, the overall slope is about 36 °, and the total volume is about 1.1 × 107m3. The underlying bedrock For silty mudstone, slippery body composed of silty clay material. The destruction mechanism of landslide is discussed by natural history analysis method and engineering geology analogy method. It is considered that the formation and development of landslide group is the combination of rock type and nature, rock mass structure and geological structure, topography, water and inducing factors result. Using the method of limit equilibrium, the stability of one of the typical landslides under the four conditions of current situation, rainstorm, blasting and rainstorm blasting is comprehensively analyzed and evaluated. The obtained stability coefficients are respectively 1.256, 0.961, 1.198 and 0.954. The calculated results It shows that rainfall is the main external factor controlling the stability of the landslide. Aiming at the actual situation of the landslide, this paper puts forward the following measures: avoiding the use of anti-slide piles to reinforce and avoiding the underground blasting operation during heavy rains; setting intercepting ditches and drainage ditches on the landslide back wall and slope, cement mortar caulking, Surface greening and other prevention and control programs.