动荷载巷道围岩裂隙演化的实验研究

运用相似模拟理论，针对巨厚薄层状复合顶板条件，进行了大比例三维巷道相似模拟实验。实验结果表明，随着工作面的推进，巷道围岩的动载系数增大，围岩内开始产生裂隙并扩展、贯通，最后导致巷道破坏。运用分形几何理论进行分析，认为裂隙分布密度符合分形特征，可定量描述巷道围岩裂隙的分布，分析结果为制定巷道支护方案，优化支护设计参数，提供了理论依据。

Experimental Study on Cracks Developing in the Surrounding Rock of Dynamic-loaded Roadway

In the light of the condition of large-depth complex rock top consisting of thin layers, the large ratio tri-dimensional similar simulation experiment of roadway has been carried out according to the theory of similar simulation. The experimental results have shown that with the working-face being advanced forward, the dynamic-load coefficient increased, cracks started to produce, extended and connected in surrounding rock of roadway, finally resulting in the breaking of roadway. Based on analyzing by the theory of fractal geometry, it is considered that the crack distributing density confirm with fractal character, can be used to quantitatively describe the distribution of cracks in the surrounding rock of roadway. The analyzed results offer the theory basis for selecting supporting scheme of roadway and optimizing design parameters of roadway support.