Bibliographic Details
| Title: |
主应力轴旋转煤巷围岩拉剪破裂分布差异及靶向控制. |
| Alternate Title: |
Distribution difference and targeted control of tensile-shear fracture of surrounding. |
| Authors: |
高永格1,2,3 gaoyongge@hebeu.edu.cn, 徐振铭1, 洛锋1,2,3 fluo527@hebeu.edu.cn, 李会园1, 王鹏1,2,3, 张顺1, 何团4, 胡佳琦1, 张德鹏1 |
| Source: |
Coal Science & Technology (0253-2336). Mar2026, Vol. 54 Issue 3, p30-45. 16p. |
| Subject Terms: |
*Strains & stresses (Mechanics), *Mining engineering, *Geotechnical engineering, *Stress concentration, *Fracture mechanics, *Rock deformation |
| Abstract (English): |
This study investigates tensile-shear fracture distributions and stress evolution in roadway surrounding rock under differential principal stresses with axis rotation, employing integrated theoretical-simulation-numerical methods for deep mining with unilateral goaf. Meso-scale fracture mechanisms are characterized, and targeted control strategies are developed for distinct failure modes. The results show: Catastrophic shear slippage along primary fracture lines constitutes the predominant mechanism governing surrounding rock mass destabilization. The slippage trajectory length exhibits a positive correlation with principal stress ratio (σ/σ.), while progressively propagating into deeper regions of the rock mass under elevated stress anisotropy. Progressive principal stress axis rotation drives macromeso tensile-shear fracture networks in roadways to undergo an evolutionary transition from stress-induced asymmetric lateral butterfly lobes-cruciform configurations-vertical butterfly anomalies, governed by multi-scale stress redistribution mechanisms. Three distinct macromeso failure modes emerge in tensile-shear fractured surrounding rock under principal stress axis rotation: The failure mode features rib-side shallow tensile failure, deep critical shear slip in corner zones, and symmetrical roof-floor convergence; Asymmetric failure mode manifests with left shoulder, right toe tensile-shear damage, deep roof-floor critical slip anomalies, and right shoulder, left toe differential deformation; The failure mode features roof-floor shallow tensile failure, deep corner shear-slip coupling, and rib-side symmetric-al deformation. The principal stress ratio exhibits a nonlinear positive correlation with the difference between the principal stress difference of the sidewalls and the roof/floor. During principal stress axis rotation, the failure mechanism of roadway surrounding rock progresses through distinct evolutionary phases dominated by critical stress tensor components. A mechanism-adaptive control methodology has been developed for distinct tensile-shear fracture modes, guided by precision-targeted control principles. This framework establishes theoretical foundations for enhancing support system efficacy and optimizing ground control costs in deep mining operations. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
为研究差异主应力条件下巷道围岩拉剪破裂分布形态及不同破坏模式的主动靶向控制方法, 以某矿深部单侧采空工作面为工程背景, 采用理论分析、相似模拟、数值模拟综合研究方法, 了差异主应力条件下巷道围岩细观拉剪破裂特征, 研究了不同角度主应力轴旋转巷道围岩拉剪破裂分布形态与应力演化规律, 提出了针对不同破坏模式的主动靶向控制方法。结果表明: 首先, 主破裂线的恶性剪切滑移是诱导围岩灾变失稳的主要因素, 随主应力比 (0/0) 增大, 主破裂滑移迹线长度呈现正相关关系, 并朝围岩深部恶性扩展延深。其次, 渐进的主应力轴旋转使巷道宏-细观拉剪破裂网络历经"左右异状蝶叶"蝶形—十字形—"上下异状蝶叶"蝶形的演变。依据主应力轴旋转角度围岩宏一细观拉剪破裂特征可划分为 3 种破坏模式: 帮侧浅部张拉, 角点深部滑移破裂, 顶底对称收敛的破坏模式; 巷道左肩角、右底角拉剪差异损伤, 顶底深部异状滑移, 右肩角、左底角差异变形的非对称破坏模式; 顶底浅部张拉, 角点深部剪切错动, 帮部对称变形的破坏模式。主应力比与帮部、顶底主应力差的差值呈非线性正相关关系; 主应力轴旋转时, 巷道围岩的破坏规律是分阶段由不同应力分量主导的应力优势演化过程。提出了以精准靶向控制原理为基础的针对不同拉剪破裂模式的靶向控制方法, 为提升支护系统效力、节约支护成本提供了理论基础。 [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
