论文部分内容阅读
岩体完整性是进行巷道顶板稳定性分级的一个重要指标,当前分级方法均是从一维角度对岩体结构进行描述,不能全面刻画出三维空间上顶板围岩的完整性。针对这一缺陷,引入裂隙岩体块体化程度理论,以块体化程度代替常规标准中表征岩体完整性的岩体质量RQD值和节理间距两项子指标,开展裂隙岩体巷道顶板稳定性分级研究,创新形成了一种适用于裂隙岩体顶板稳定性分级的BT分级方法。以块体百分比和块体体积曲线为基本依据,构建出裂隙岩体巷道顶板围岩块体化程度的解算流程;运用AHP法对稳定性影响因素权重进行了排序,制定出稳定性分级方法与标准。以铜坑矿92号矿体裂隙岩体试验区巷道顶板结构面调查数据和岩石力学参数为基础,运用传统分级方法 RMR法和BT法分别对各试验区巷道顶板稳定性进行评价,对两种分级结果进行比较分析,结果表明:与传统的RMR法相比,BT法在稳定性描述、分级准确性和安全管理指导作用等方面更为优越,更能够客观真实地反映出裂隙岩体巷道顶板稳定性。研究成果可为复杂裂隙岩体条件下的巷道顶板安全分级与管理提供更为可靠的科学依据。
The integrity of rock mass is an important index for the stability classification of roadway roof. The current classification methods describe the rock mass structure from a one-dimensional perspective and can not fully describe the integrity of roof rock in three-dimensional space. In view of this defect, the theory of the degree of block rock mass is introduced, and the block rock mass is replaced by the standard of RQD and the pitch of rock mass, Sex grading research and innovation have formed a BT classification method suitable for the stability classification of fractured rock mass roof. Based on the block percentage and the volume curve of block, the solution flow of block surrounding rock mass of tunnel roof in fractured rock mass was established. The weights of stability influencing factors were sorted by AHP method, and the method of stability classification With the standard. Based on the survey data and rock mechanics parameters of mine tunnel roof in the test area of No.292 ore body in Tongkeng Mine, the stability of roadway roof in each test area was evaluated by using the traditional classification method RMR and BT. The results show that compared with the traditional RMR method, the BT method is more superior in terms of stability description, grading accuracy and guidance of safety management, which can objectively and truly reflect the roof stability of the tunnel Sex. The research results can provide a more reliable scientific basis for safe classification and management of roadway roof under complex fractured rock mass conditions.