露天转地下井工开采对边坡稳定性的影响评价

发布时间：2018-05-25 07:58

本文选题：露天煤矿 + 边坡稳定　；参考：《内蒙古科技大学》2015年硕士论文

【摘要】：一般情况下，在地下开采影响范围内，无论地下采取与边坡体之间的相对空间位置关系如何，，只要有地下开采的扰动作用，边坡的稳定状态都要受到影响。边坡稳定与否的最终结果是受地下与露天开采的共同作用，需要解决的主要难点是如何考虑露井联合开采作用下边坡岩体的破坏机制和如何评价计算的问题。本文针对地下开采诱发地下开采工作面前方的滑坡的影响及其安全措施进行研究，通过采用FLACD3D数值模拟的方法，分析不同的开采推进顺序，研究其对边坡岩体变形规律的影响，分析边坡岩体位移和应力的变化特征，进而确定最佳的开采方式。得出的结论：顺坡开采对边坡的稳定更有利，因此，采用沿工作面顺坡开采的推进顺序。合理方案的确定是通过采用放坡减载、抗滑桩加固、预应力锚索加固三种方式对比分析，采用不同的边坡角、安全平台宽度，采用安全系数和工程造价对比分析得出最优方案。由于减载量的不同得出的减载费用也相差很大，抗滑桩加固和预应力锚索加固虽然也能满足边坡稳定性的要求，但其加固费用远大于减载的费用，减载方案既满足了边坡稳定性的要求，同时减载的费用相对较低。因此选用放坡减载的方案。以便在地下动态开采过程中能够最大限度减少治理费用，又能最大限度地回收煤炭资源。
[Abstract]:In general, under the influence of underground mining, no matter how the relative spatial position relationship between underground and slope is taken, the stability of the slope will be affected by the disturbance of underground mining. The final result of the slope stability is the joint action of underground and exposed mining and the main difficulties that need to be solved. How to consider the failure mechanism of slope rock under combined action of open pit and how to evaluate and calculate it?
In this paper, the effects of underground mining on the landslides in the front of underground mining face and its safety measures are studied. By using the method of FLACD3D numerical simulation, the influence of different mining advance sequence is analyzed, the influence on the deformation law of slope rock mass is studied, the variation characteristics of the rock mass displacement and stress are analyzed, and the best one is determined. The conclusion is that the slope mining is more favorable to the stability of the slope. Therefore, the rational scheme is determined by the comparison and analysis of three ways by adopting slope reduction, anti slide pile reinforcement and prestressed anchor cable reinforcement, using the different slope angle, the safety platform width and the safety factor. Compared with the project cost, the optimal scheme is obtained. As the load reduction cost of load reducing is very different, the reinforcement of anti slide pile and the reinforcement of prestressed anchor cable can meet the requirements of slope stability, but the cost of reinforcement is far greater than the cost of load reduction. The load reduction scheme not only satisfies the requirements of slope stability, but also costs the cost of the load reduction. It is relatively low in use. Therefore, the scheme of slope reduction is chosen to minimize the cost of treatment in the process of underground dynamic mining and to maximize the recovery of coal resources.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD824.7

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