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高陡山区露天转地下开采边坡稳定性研究
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摘要
在露天转地下开采过程中,原岩应力平衡状态的破坏,使边坡和一定范围内的地表产生位移变化,这种变化一般分为整体和局部两种,整体位移变化表现为:附近地表的水平移动和下沉;局部位移变化表现为:边坡岩体的崩塌和滚落。为了保障作业正常进行,保护作业人员与设备、以及矿产资源与地表环境,对边坡稳定性分析和预测以及根据分析结果实施合理的安全防护势在必行。
     本文以四川会东铅锌矿露天边坡为研究对象,针对露天转地下开采过程中边坡稳定问题展开一系列研究。首先,搜集并总结会东矿边坡变形观测数据,建立露天西边坡变形数学模型,采用遗传程序设计理论对边坡整体稳定性进行预测,并对照已有的观测数据,证明了该方法有很好的预测精度。其次,对边坡局部崩塌失稳进行分析,确定可能发生岩崩的区域为西边坡北侧松散岩组及北边坡F_(15)以西;应用概率统计原理对典型断面岩崩落石的滚落过程进行二维模拟,确定落石的影响范围在60~80m,弹跳高度及滚落过程中动能较小,这些计算结果,为岩崩的防治提供可靠的依据;最后根据上述失稳分析结果,提出各典型工点的防护措施,并采用力学分析方法对防护的可靠性和合理性进行分析以确定其可行性。
     论文结合计算机智能分析预测与模拟技术和现代分析方法来进行边坡稳定性研究,在一定程度上体现了岩体工程处理方法应用的趋势。
The balance of original stress is destroyed in the course of open-pit into under mining, which bring displacement of slope and surface in main area. Commonly the movement is divided into global and local forms. Horizontal movement and subsidence in nearby surface is represented in global change, while collapse and fall-roll of slope rock is repressed in local. In order to guarantee ordinary operation, maintained operating personnel and equipments and protect mineral resource and surface environment, the analysis and expectation of slope stability are imperative as well as reasonable implementation of safety protection based on the analysis results.
     Taking the open-pit slope at Hundong Lead-Zinc Mine as object, the stability of slope during turning open-pit into under mining is studied. Firstly, collecting and summarizing observation data of slope distortion in mine to build distortion mathematics model. Genetic programming is used to analyze and predict the slope stability, and validating the prediction accuracy of this technique contrasting observation data. Secondly analyzing the collapse and fixing on the area that eventspossibly occur, ensuring that the loose petrofabric in north side of west slope and the west strict of F_(15) fault. The principle of probability statistics is used to simulate the course of rockfall at typical section. The result shows that the influence scope of rockfall is 60-80m and jumping height and kinetic energy variations is relatively small. Protection of rockfall is provided according to the statistical results. Finally protective measures are proposed by the results of studies, meanwhile analyzing the reliability and rationality of defenses by means of physical process.
     The computer intelligent analyses, expectation and simulation are used in study of slope stability as well as modern analysis method, which embodies some trends on treatment of geotechnical engineering.
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