某矿顶板岩体可崩性评价及其经验

Evaluation of Cavability of Roof Rock Mass and Experiences in a Certain Mine

以大厂铜坑矿92号矿体顶板宽条带灰岩为研究对象,通过丰富的野外实测及统计资料,运用赤平投影和AutoCAD技术找出了三组优势结构面,同时利用国际上通用的RMR分类和Q系统分类进行岩体质量分级,得出矿岩体质量等级为Ⅲ级,根据Laubscher的岩体质量地质力学分级法,通过采动力系数修正,求出采矿岩体质量分值MRMR为Ⅳ级,最后根据MRMR和Laubscher的可崩性曲线来评定初步设计中三房两柱法的合理性。该项研究对92号矿体顶板的安全崩落具有重要的指导意义,对类似工程问题也具有参考价值。

For researching the cavability of No. 92 ore body in Tongkeng Mine, quit a number of investigation of engineering geology has been carried out. Making use of equatorial projection and computer aid design technology to find out triple dominant position joint sets, qualitative classification of roof rock mass is carried out according to the rock mass rating (RMR) and Q Classification systems that are very often used in the world at present, and the result is the third grade. In addition, according to Laubscher's geo-mechanics Classification system of rock, which has been properly modified by mining influence coefficient, the mining rock-mass rating (MRMR) has been evaluated, and it is the fourth grade. At last, the reasonableness of primarily designed caving area is evaluated by the MRMR and Laubscher's caving graph. The results are significant for the engineering practice and other similar projects.