某露天矿山最终边坡稳定性及加固治理研究

发布时间：2018-05-31 15:04

本文选题：露天矿山 + 最终边坡　；参考：《重庆科技学院》2017年硕士论文

【摘要】：露天开采作为主要的矿产资源开采方式,随着开采深度的不断延深,往往会形成高度很大且坡度陡峭的边坡。最终边坡为开采作业进行到露天矿的设计境界时所形成的非工作帮边坡。为了获得最大的经济效益,最终边坡角在设计时通常是在保障边坡安全性的前提下取最大值,因此高陡的最终边坡在工程扰动和自然因素的共同作用下,容易导致边坡失稳,进而发生滑坡、塌落、倾倒等破坏,对边坡影响范围内的人员及设备产生严重的威胁。本文以某石灰岩露天矿山最终边坡作为工程背景,通过收集此矿山相关设计资料,并结合现场地质调查,掌握了矿区地质构造和工程地质条件,由此确定了三座存在滑移可能性的最终边坡作为研究对象。对边坡石灰岩矿石进行了采样,并通过室内岩石力学试验,确定了岩体力学性能指标,以此作为数据基础,运用强度折减法对边坡稳定性进行了数值分析。分析结果显示,4-4’剖面边坡安全系数为1.15,低于现行规范所要求的1.20,存在发生滑坡的可能性。通过比较各类边坡防治措施的特点及适用条件,结合数值分析的结果,对该最终边坡进行了加固治理方案设计。加固方式选取了预应力锚索,对锚固角、锚索间距、锚索长度、钢绞线规格及数量、预应力等主要锚固参数进行了设计计算,并运用FLAC3D对加固后的最终边坡进行了模拟分析,得到其安全系数提高到1.51的分析结果,由此验证了治理方案的加固效果表现良好。露天矿边坡的稳定性分析、加固、治理等对露天矿安全生产具有极其重要的意义。本文对最终边坡稳定性进行数值分析的思路以及对加固方案的选取与设计,对同类岩质边坡具有一定的参考价值和借鉴作用。
[Abstract]:As the main mining method of mineral resources, open-pit mining often forms high and steep slope with the deepening of mining depth. The final slope is the non-working slope formed when the mining operation is carried out to the design boundary of the opencast mine. In order to obtain the maximum economic benefit, the final slope angle is usually taken the maximum value under the premise of the safety of the slope in the design, so the high and steep final slope under the joint action of the engineering disturbance and natural factors will easily lead to the slope instability. Then the landslide, collapse, dumping and other damage, serious threat to personnel and equipment in the affected area of the slope. Taking the final slope of a limestone opencast mine as the engineering background, through collecting the relevant design data of the mine and combining with the field geological investigation, the geological structure and engineering geological conditions of the mining area are mastered. Thus, three final slopes with the possibility of sliding are determined as the object of study. The slope limestone ore was sampled, and the rock mass mechanical performance index was determined by laboratory rock mechanics test. The strength reduction method was used to analyze the slope stability numerically on the basis of the data. The results show that the safety factor of the slope is 1.15, which is lower than 1.20 required by the current code, and there is the possibility of landslide. By comparing the characteristics and applicable conditions of various slope prevention measures and combining the results of numerical analysis, the final slope reinforcement scheme is designed. The main anchoring parameters, such as anchoring angle, cable spacing, anchor cable length, steel strand size and quantity, prestressing force and so on, are designed and calculated, and the final reinforced slope is simulated and analyzed by FLAC3D. The safety factor is increased to 1.51, which verifies that the reinforcement effect of the treatment scheme is good. The stability analysis, reinforcement and treatment of open pit slope are of great significance to the safe production of open pit. In this paper, the idea of numerical analysis of the final slope stability and the selection and design of the reinforcement scheme have a certain reference value and reference value for the similar rock slope.
【学位授予单位】：重庆科技学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD872.5

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