朱仙庄矿10煤地质力学评估及其回采巷道分类支护

Geological mechanics evaluations of Zhuxianzhuang coal mine and classified supporting technology for roadway in it

为有效解决深部煤炭开采过程中回采巷道围岩失稳严重、变形破坏剧烈等问题,利用室内试验测试、围岩结构观测、地应力原位测量及现场监测等手段,分析得出巷道围岩地质力学属性和原岩应力分布特征,并结合矿井生产技术条件对巷道围岩进行地质力学评估和稳定性分类。以淮北朱仙庄煤矿10煤的Ⅱ1053工作面为工程背景,构建基于地质力学评估的巷道分类控制支护体系,并对该工作面回采巷道支护参数进行优化设计。用FLAC3D数值模拟和井下监测等技术方法,对掘进及回采期间巷道围岩应力、位移、锚杆受力及塑性区分布特征等进行分析。结果表明,将试验测试和现场数据资料相结合,以地质力学评估为基础的巷道分类支护技术明显优于以往经验设计法,能有效保障回采工作面的安全快速推进。

Large deformation and intense destruction of mining roadway seriously affects the safety and production in the Zhuxianzhuang coal mine. For combating this problem,geological properties of the surrounding rock masses were evaluated by using comprehensive technical means,including laboratory test,small borehole camera observation and in-situ stress measurement. Taking the Ⅱ1053 working face as an example,a classified supporting technology was developed for the mining roadway based on geological mechanics evaluation. By means of numerical simulation with FLAC3 Dand the field monitoring,the stress field,displacement field and distribution of plastic zones in the surrounding rock masses during the roadway excavation and working face extraction were studied. The result shows that the classified support technology for mining roadway,based on geological mechanics evaluation is far superior to that on previous experience,and can much more effectively guarantee rapid working face advances.