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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。
In order to study the crack propagation of pre-cracking blasting of coal column under the action of ground stress, the model experiment of presplit blasting is established with the guidance of Froude ratio method. The crack propagation mechanism in coal under the coupling of ground stress and blast load Were studied. The model describes the macroscopic failure under the action of blast load. The results show that the model experiment is basically consistent with the field test results. The crack is mainly formed by the interaction of the compressive wave and the unloading wave. The geostress can restrain the development of the crack. The principal stress has obvious guiding role for the development of the tensile crack .