CAJ | 학술논문

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。
암체완정성시진행항도정판은정성분급적일개중요지표，당전분급방법균시종일유각도대암체결구진행묘술，불능전면각화출삼유공간상정판위암적완정성。침대저일결함，인입렬극암체괴체화정도이론，이괴체화정도대체상규표준중표정암체완정성적암체질량RQD치화절리간거량항자지표，개전렬극암체항도정판은정성분급연구，창신형성료일충괄용우렬극암체정판은정성분급적BT분급방법。이괴체백분비화괴체체적곡선위기본의거，구건출렬극암체항도정판위암괴체화정도적해산류정；운용AHP법대은정성영향인소권중진행료배서，제정출은정성분급방법여표준。이동갱광92호광체렬극암체시험구항도정판결구면조사수거화암석역학삼수위기출，운용전통분급방법RMR법화BT법분별대각시험구항도정판은정성진행평개，대량충분급결과진행비교분석，결과표명：여전통적 RMR 법상비，BT 법재은정성묘술、분급준학성화안전관리지도작용등방면경위우월，경능구객관진실지반영출렬극암체항도정판은정성。연구성과가위복잡렬극암체조건하적항도정판안전분급여관리제공경위가고적과학의거。
Rock mass integrity is an important indicator for the stability classification of roadway roof, however, the current grading methods just describe from the one-dimensional angle of rock mass structure, which cannot fully reflect the integrity of the roof rock in three-dimensional. In order to overcome the limitation, the stability classification of roadway roof in fractured rock mass is studied by using blockiness as a rock mass integrity index instead of the two sub-indicators of rock mass quality RQD value and joint spacing in the conventional grading method, creating a kind of innovation especially suitable for the fractured rock mass stability classification methods called BT classification methods. According to the block percentage and block volume distribution curve, a solving process of the blockiness of the roadway roof surrounding rock in fractured rock mass is built. An AHP method is applied to determine the weights of the stability factors. The method and the standard of stability classification are constructed. Based on structure surface data and rock mass mechanical parameters of the roadway roof in four fractured rock mass experimental zones in the ore body No. 92 of Tongkeng mine, using the RMR method in the traditional classification methods and the new development method of roadway roof stability classification for each test area, two different classification results are comparatively analyzed, the results show: compared with the traditional RMR classification methods, BT method is more superior to the stability of the description, classification accuracy and safety management guidance, it can more truly and objectively reflect the fractured rock mass roadway roof stability. Research results can provide more reliable scientific basis for the condition of complex fractured rock mass of roadway roof safety classification and management.