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借助于动光弹测试手段,研究了含两组结构面的爆炸模型中破裂发展的基本规律。其中实验模型是从含有两组主结构面的岩体中抽象出来的。试验结果表明:结构面(菱形边)由于强度低而破裂扩展速度高;在菱形短轴方向,应力波作用产生的条纹级数高,主应力差大,破裂易发展。由此得出沿结构面和菱形短轴方向由于应力作用导致破裂优势发展的结论,这一结论可作为裂隙岩体爆破设计的依据。
With the aid of dynamic photoelastic testing methods, the basic law of fracture development in explosion models containing two sets of structural planes was studied. The experimental model is abstracted from the rock mass that contains two main structural planes. The test results show that the structural surface (diamond edge) has high rupture and expansion speed due to its low strength; in the direction of the short axis of the diamond, the stress wave produces high fringe series, the main stress difference is large, and the fracture is easy to develop. The conclusion is drawn that the cracking dominance develops along the structural plane and the short axis of the diamond due to the stress. This conclusion can be used as the basis for blasting design of fractured rock mass.