采矿与岩层控制工程学报2025，Vol.7Issue(2)：90-105,16.DOI:10.13532/j.jmsce.cn10-1638/td.2025-1013
强动载扰动下高应力巷道底板冲击机理与爆破参数优化
Mechanism of floor rockburst and blasting parameter optimisation for high-stress roadway subjected to severe dynamic loads
摘要
Abstract
For mining in the north-west of China,coalburst frequently occurs when subjecting to horizontal tectonic stress and strong dynamic loading.Experiment,theoretical analysis,numerical simulation and engineering test were performed to investigate the large-area rock burst floor failure in 208 working face.Based on the elasticity theory and the catastrophe theory,the influence mechanism of high stress and dynamic loading was analyzed,and the principle of coalburst mitigation by blasting was studied.The deformation,displacement and surface acceleration of the surrounding rock of roadways caused by dynamic loading with and without floor blasting were analyzed.The horizontal stress should be taken into account to avoid exacerbating the damage to the tunnel or the coalburst due to asymmetric damage.The influence of blasting hole angle,charge density and uncoupling coefficient on the pressure relief effect of floor blasting were simulated and analyzed.The results show that the high horizontal stresses tend to exacerbate the asymmetric damage after floor blasting,inducing coalburst.The hole angle determination is the premise of the design of the floor blasting parameters,and its adaption to the natural fracture or bedding plane of the rock mass should be considered to improve the blasting pressure relief effect.The optimal interval of the uncoupling coefficient is 1.46,beyond which the damage zone and crack extension length are significantly larger than the other.The charge density is positively correlated with the damage zone of rock mass,crack propagation length and surrounding rock stress,but the strengthening increase is not obvious under the larger charge density.The floor deformation was reduced by 22%to 61%after floor blasting optimisation parameters.During field implementation,no microseismic events with energy more than 1×105 J were observed and the proportion of tremors in floor reduced significantly.The results can be used as a reference for the design of floor blasting parameters for high-stress roadways subjected to severe dynamic loading.关键词
动载扰动/水平应力/冲击地压/底板爆破/参数优化Key words
dynamic loading/horizontal stress/coalburst/floor blasting/parameter optimisation分类
矿山工程引用本文复制引用
李庚,曹安业,窦林名,吕国伟,彭雨杰,郝琪,薛成春,谢永勤,史矿民..强动载扰动下高应力巷道底板冲击机理与爆破参数优化[J].采矿与岩层控制工程学报,2025,7(2):90-105,16.基金项目
国家重点研发计划资助项目(2022YFC3004603) （2022YFC3004603）
国家自然科学基金资助项目(52274098) （52274098）
江苏省研究生科研与实践创新计划资助项目(KYCX23_2797) （KYCX23_2797）
中国矿业大学研究生创新计划资助项目(2023WLKXJ035) （2023WLKXJ035）
