胡家沟石灰岩矿房柱法安全开采参数优化研究

发布时间：2018-04-21 14:52

本文选题：采场参数 + 石灰岩矿　；参考：《重庆科技学院》2015年硕士论文

【摘要】：我国是世界上石灰岩资源非常丰富的国家之一，目前全国正在生产的石灰岩地下矿山企业数量较多，但大多数矿山属于民采民运，不仅矿山开采规模较小、生产技术落后，而且随着开采时间的延长和开采范围的扩大，原有的经验对地应力的处理考虑不周全，导致矿房采场参数取值不合理，严重影响到矿山生产的安全、经济及高效。目前重庆市石灰岩地下矿山主要集中在大足、荣昌等区县，主要采用房柱法开采，手持式钻机打眼，爆破落矿，小型挖掘机或者装载机装矿，采场内采用汽车运输。大多数矿山采用留置石灰岩护顶层的房柱法生产，在开采石灰岩地下矿山中选取设计合理的采场参数很重要，不仅可以确保顶板稳定不发生采场塌陷和地表沉陷等大规模的地压活动，还可以最大限度的增加矿石回采率，提高矿山企业的经济效益。本课题结合大足区胡家沟石灰岩矿的实际开采情况，针对胡家沟矿山的地质条件、矿岩力学性能，，采用理论计算和数值模拟房柱法开采参数中的矿房跨度、采高、矿柱直径和矿柱间距，进行对比分析原开采设计参数，得出以下结论：采用一定的理论计算房柱法采场参数得出矿房跨度10m、护顶层厚度9m、矿柱间距10m和矿柱直径6m，符合现场实际情况和工程经验；应用FLAC3D软件数值模拟胡家沟石灰岩矿房柱法开采过程中围岩、矿柱等的应力、位移和塑性区的变化规律，从采高、矿房跨度、矿柱直径和间距等四个方面得到采高6m、矿柱直径6m、矿柱间距8m、矿房跨度10m，从而在保证安全的前提下最大限度地合理开采矿山资源。在采场结构参数计算研究中，理论计算和数值模拟研究所得结果接近，符合工程经验和现场实际情况；相比矿山以前使用的采场结构参数，优化研究结果更有利于矿山进行开采作业，并在矿山得以初期应用，在安全、经济、效益上更能满足矿山生产。
[Abstract]:China is one of the countries with rich limestone resources in the world. At present, there are many underground limestone mining enterprises in the country. However, most of the mines belong to the civilian movement, not only the mining scale is small, but the production technology is backward. With the prolongation of mining time and the expansion of mining scope, the original experience does not consider fully the treatment of in-situ stress, which leads to unreasonable selection of mine stope parameters, which seriously affects the safety, economy and efficiency of mine production. At present, the underground mines of limestone in Chongqing are mainly concentrated in Dazu, Rongchang and other districts and counties. They mainly adopt the method of house and column mining, hand-held drill drilling, blasting and mining, small excavators or loaders to load ore, and car transportation in mining sites. Most mines use the roof column method of retaining limestone to protect the top floor. It is very important to select the reasonably designed stope parameters in the mining of limestone underground mines. Not only can the roof stability avoid large-scale ground pressure activities such as stope collapse and surface subsidence, but also the mining recovery rate can be increased to the maximum extent, and the economic benefits of mining enterprises can be improved. Combining with the actual mining situation of Hujiagou limestone mine in Dazu area, aiming at the geological conditions and the mechanical properties of the mine, this paper adopts theoretical calculation and numerical simulation of the roof span and mining height in the mining parameters of the Hujiagou mine. The diameter of the pillar and the distance between the pillars are compared and analyzed, and the following conclusions are drawn: By using certain theory to calculate the stope parameters of the roof column method, it is found that the roof span is 10m, the top protection thickness is 9m, the pillar spacing is 10m and the pillar diameter is 6m, which is in line with the actual situation and engineering experience on the spot. FLAC3D software is used to simulate the variation of stress, displacement and plastic zone of surrounding rock, pillar and so on in Hujiagou limestone house pillar mining process. The mining height is 6m, the diameter of pillar is 6m, the distance of pillar is 8m, and the span of mine house is 10m. In the study of stope structure parameter calculation, the results obtained by theoretical calculation and numerical simulation are close, which accord with the engineering experience and the actual situation of the site, and compared with the stope structure parameters used before the mine, The optimized research results are more favorable to mine mining operation and can be applied in the initial stage of mine, and can meet the needs of mine production in safety, economy and benefit.
【学位授予单位】：重庆科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD872.5

【参考文献】