结构面切割不同岩性巷道围岩关键块体研究

摘要

In order to study the chamber stability of Hongling lead zinc mine under the cutting effect of structural plane, analyze the crushing effect of surrounding rock of roadway under the cutting effect of structural plane,and reduce the danger block failing risk in the process of mining. The structural plane of rock mass is measured and the spatial geometric parameters of the structural planes is obtained by using digital photogrammetry technique. The classification of rock mass quality is conduc-ted based on BQ index,and the mechanical parameters of rock mass is calculated based on general Hoek-Brown strength crite-rion. The discrete crack network model of structural plane is established,the key block of the key block of the roadway with dif-ferent lithology under the cutting effect of structural plane is studied in depth,and the broken degree evaluation results is giv-en. The study results show that:the marble rock mass is the most broken one with the number of 123 key blocks,the slate rock mass is less broken one with the number of 79 key blocks,the skarn rock mass is the least broken one with the number of 27 key blocks.%为研究红岭铅锌矿矿房在结构面切割作用下的稳定性,分析巷道围岩受结构面的切割破碎程度,减少回采过程中块体掉落造成的危险,采用数字摄影测量技术,进行岩体结构面测量,获取结构面基本参数信息;根据BQ指标进行岩体质量分级,基于推广Hoek-Brown强度理论进行岩体力学参数计算;建立结构面离散裂隙网络模型,进行结构面切割下的不同岩性巷道关键块体研究,并给出破碎程度评价.研究表明大理岩岩体产生123块关键块体,最破碎;板岩岩体产生79块关键块体,破碎程度居中;矽卡岩岩体产生27块关键块体,破碎程度最小.