巨厚薄层状顶板回采巷道围岩裂隙演化规律的相似模拟试验研究

运用相似模拟试验和分形几何理论，研究了受采动影响的回采巷道围岩裂隙产生-扩展-贯通-破坏的演化规律。巷道两帮围岩裂隙呈弧形向巷帮深处扩展，并按幂函数规律衰减；两帮顶板裂隙呈二次曲线演化规律：巷道上方顶板裂隙主要集中在巷帮上方。用裂隙密度分形维数定量描述了巷道围岩裂隙的分布和演化。研究结果有利于了解巷道围岩内部破裂的发生与发展规律，为选择巷道锚固方案和优化锚固设计参数提供了依据。

Similar Simulation Study on Crack Development Law of Surrounding Rocks of Roadway with Great-Thick Thin-Bedded Top Roof

The evolution law of the crack generation-extension-connection-failure in the surrounding rocks of roadway caused by mining is investigated in the paper by using similar simulation and fractal geometry theory. Cracks in the two roadway walls are extending to the depth in arc shape and diminish in a power function law. Cracks at the top of the two sides abide by the conic evolution law. The cracks of the roadway top mostly concentrate at the top of the roadway walls. The crack distribution and evolution of the surrounding rocks of roadway can be quantitatively depicted by the fractal dimension of crack density. The research results are useful for understanding the occurrence and development law inside the surrounding rocks,and applied as the basis of selection of bolting scheme of roadway and optimization of bolting parameters.