中文摘要：

为了研究地应力作用下煤体柱状装药预裂爆破裂纹扩展,以Froude比例法为指导,建立煤层预裂爆破的模型实验,并对地应力和爆炸荷载耦合作用下煤体中的裂纹扩展机理进行了研究。该模型描述了在爆炸荷载作用下的宏观破坏现象。研究结果表明：模型实验与现场试验结果基本一致;裂纹主要是由压缩波和卸载波共同作用形成的;地应力对裂纹的发展具有抑制作用;主应力对于拉伸裂纹的发展具有明显的导向作用。

英文摘要：

In order to study the coal crack propagation in columnar charge pre-splitting blasting under crustal stress,a model investigation on coal pre-splitting blasting was built based on Froude ratio method,and the mechanism of coal crack growth under the coupling action of crustal stress and blasting load was investigated.Macro damage characteristics are described by this model experiment.Experimental results show that model investigation is basically consistent with field test results,cracks are formed by combined action of pressure wave and tensile wave under explosion loads.The role of crustal stress is to restrain crack growth.Principal stress has obvious guide action for tensile crack growth.