中厚矿体崩落卸压机理及动态约束研究

项目名称： 中厚矿体崩落卸压机理及动态约束研究

项目编号： No.50804036

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 王文杰

作者单位： 武汉科技大学

项目金额： 20万元

中文摘要： 本项目以崩落法卸压开采为研究思路，系统地研究了采场应力与回采范围及矿体倾角的关系，分析了中厚矿体应用崩落法开采时采场地压的变化规律和分布特征；研究认为影响卸压开采的因素主要有矿体水平厚度，矿体倾角，卸压角，炮孔边孔角，散体放出角，回采分段高度，回采巷道到矿体下盘的距离；分析了卸压开采与影响因素间的关系，研究了卸压与矿石回采指标间的关系，建立了崩落法卸压开采的参数优化模型，认为只有同时满足卸压并能取得相应技术经济指标的矿体才能实现卸压开采；研究了卸压开采与巷道支护间的协调关系，认为卸压可以有效控制巷道围岩的变形大小，但锚杆支护并不在于控制巷道围岩的变形程度，而在于协调巷道周围岩体的变形，从而最大限度的利用岩体自身的稳定能力。本项目研究成果，为中厚矿体的安全开采提供了新的思路和理论支持，具有广泛应用前景。

中文关键词： 中厚矿体；崩落卸压；卸压机理；动态约束；优化模型

英文摘要： The depressurized mining of sublebl caving is researched in the project for the inclined medium-thick ore bodies mining. So the ground presses distributed characteristic of depressurized mining for inclined medium-thick orebody is analyzed, the relationship of ground presses and stope area and orebody dip is researched. The influence factors of depressurized mining are horizontal thickness of orebody, orebody dip angle, pressure angle, side blasting hole angle, losse granular flowing angle, sublevel height and the distance of stoping tunnel to orebody footwall. The research analysized the relationship between depressurized mining and influence factors, and the relationship between depressurized mining and ore recovery index, established the parameters optimization model of depressurized mining. The result showed that the depressurized mining not only need to reduce the pressure but also need to obtain good technical and economic indexes. The depressurized mining and tunnel supporting coordination relationship is researched that depressurized mining can effectively control the deformation of surrounding rock of tunnel bolting in size, the bolt supporting can not control the defomation of tunnel surrounding rock but can correspond the surrounding rock deformation of bolt supporting tunnel, thereby the rock mass maximal stability capacity of itself can be used. So the new mining method and theory for the orebody safety mining is put forward and the method has wide application prospect.

英文关键词： medium-thick orebody; sublevel caving depressurized mining; depressurized mechanism; dynamic constraint; optimization model.