煤矿安全2025，Vol.56Issue(3)：127-136,10.DOI:10.13347/j.cnki.mkaq.20240112
布孔参数对导向缝槽-静态膨胀协同致裂效果的影响规律研究
Study on the influence laws of hole distribution parameters on guided groove-static expansion synergistic fracturing effect
亓佳利 1李伟清 1和志永 2韩金明 3张建 1张假妮 1卢绪涛 1王怀远 1李长青1
作者信息
- 1. 山东能源鲁西矿业集团有限公司,山东 菏泽 274700
- 2. 山东能源集团西北矿业有限公司,陕西 西安 710005
- 3. 山东科技大学 能源与矿业工程学院,山东 青岛 266590
- 折叠
摘要
Abstract
To further enhance the weakening capability of the roof by static expansion fracturing technology,the study explores the influence of construction parameters on the stress distribution around boreholes.Based on the principles of elasticity and fracture mechanics,the synergistic fracturing mechanism between guided groove and static expansion was revealed.Adopting the PFC2D dis-crete element method,a corresponding numerical model for static expansion fracturing was established and biaxial confinement and static expansion interaction simulations were conducted by setting different construction parameters.The results indicate that:com-pared to the conventional single-hole unconfined static expansion fracturing,the guided groove can effectively enhance the effect of static expansion fracturing,and the further the distance from the hole center,the more obvious the lifting effect;the discrete element method can effectively simulate the stress distribution during the static expansion-induced cracking process.There is a positive cor-relation between the static expansion force,borehole diameter,and the length of the guided groove,and the circumferential stress.Conversely,the angle of the guided groove,the stress coefficient,and the burial depth are negatively correlated with the circumferen-tial stress;the sensitivity ranking of hole parameters is as follows:borehole diameter>groove angle>groove length.In practical ap-plications,the aperture and slot length should be increased as much as possible and the groove angle should be reduced;the groove alters the characteristics of circumferential stress distribution;however,the guiding effect of the groove has its limitations.There ex-ists competitive crack initiation and propagation behavior between the tip of the groove and the surrounding area of the borehole.关键词
顶板弱化/静态膨胀致裂/导向槽/爆破致裂/水力压裂Key words
roof weakening/static expansion fracturing/guided groove/blasting cracking/hydraulic fracturing分类
矿山工程引用本文复制引用
亓佳利,李伟清,和志永,韩金明,张建,张假妮,卢绪涛,王怀远,李长青..布孔参数对导向缝槽-静态膨胀协同致裂效果的影响规律研究[J].煤矿安全,2025,56(3):127-136,10.
