切缝药包光面爆破裂纹扩展时空演化分析

切缝药包光面爆破裂纹扩展时空演化分析1

胡建华教授，邓煜林，王昌，杨春

（中南大学资源与安全工程学院，湖南长沙410083）

中图分类号：TD235 文献标志码：A

摘要：光面爆破机理复杂，裂隙演化具有不确定性，现场试验难以完整观察到炮孔间裂纹的起裂、扩展至贯通。采用CAD与ANSYS联合建模技术构建空气不耦合光面爆破数值模型，运用显式动力分析软件LS-DYNA定义岩石单元失效计算获得切缝药包光面爆破裂纹扩展演化过程，从时空演化角度研究光面爆破裂纹扩展规律，从而为矿山巷道爆破工程提供更精确的指导。研究结果表明：1）CAD与ANSYS联合建模技术弥补了ANSYS 对于复杂模型构建的缺陷，实现精确耦合数字建模；2）定义岩石单元失效方法可以使得爆破裂纹演化过程更为直观，切缝药包爆破相较一般空气不耦合装药结构爆破，炮孔周壁产生的径向裂纹和分叉裂纹显著减少；3）模拟不耦合系数1.5、1.8、2.25切缝药包光面爆破裂纹扩展时空过程，发现切缝药包爆破裂纹扩展演化规律，其裂隙数量随着不耦合系数的增大而减少，裂纹扩展演化长度也随之变短，分叉裂纹扩展演化明显降低，当不耦合系数为1.8时，数值模拟切缝药包爆破裂纹扩展演化形成较佳的贯通裂纹，获得较好的爆破效果。

关键词：切缝药包；时空演化；联合建模；贯通裂纹；数值模拟

Numerical Analysis of the slotted cartridge blasting crack extension by temporal-spatial evolution

Hu Jianhua Deng Yulin

(School of Resources&Safety Engineering, Central South University,Changsha Hunan 410083,China)

Abstract: Based on the complexity and uncertainty of smooth blasting, it is difficult to observe the blasting crack by the crack initiation, extension and transfixion through the field test. The model of smooth blasting that air as coupling medium is established by combining CAD with ANSYS. The explicit dynamic software LS-DYNA is used to simulate slotted cartridge blasting crack extension with elements failure is defined, to provide more accurate guidance for mine laneway blasting projects from the aspects of temporal and spatial evolution with multi-direction cutaway views. The research results as follows: 1) Joint modeling with CAD and ANSYS can fill the gap of ANSYS for complex model modeling, and achieve refined digital modeling for roadway; 2) Blasting crack extension is more intuitive with elements failure is defined, and which has contributed to the analysis of cutting effect. The blast-induced crack surrounding the hole and crack bifurcation phenomenon are reduced significantly, when slotted cartridge blasting is compared with the model of smooth blasting that air as coupling medium; 3) Through the temporal and spatial evolution simulation of slotted cartridge when decoupling coefficient was 1.5、1.8、2.25, found that the number of slotted cartridge blasting crack reduce with the increase of decoupling coefficient, crack extension length becomes shorter, the bifurcation of crack extension decreased significantly; When decoupling coefficient is 1.8, the numerical simulation of slotted cartridge blasting crack extension form better transfixion crack evolution, obtain good blasting effect.

Keywords: slotted cartridge；temporal and spatial evolution；joint modeling；transfixion crack；numerical simulation

基金项目：国家十二五科技支撑计划（No. 2015BAB12B01），国家自然科学基金资助项目（No. 41672298），湖南省自然科学基金资助项目（2016JJ2145）

作者简介：胡建华（1975—），男，湖南衡南人，博士，教授，从事高效安全采矿技术与岩土工程的稳定性分析研究