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基于Monte-Carlo方法利用UDEC中的fish语言编制了离散裂隙网络生成程序,实现了对采动顶板裂隙的模拟.基于某工作面地质条件,采用该程序生成了5种不同发育程度的裂隙数值模型,研究了顶板裂隙发育程度对采动煤岩体支承压力的影响.结果显示:裂隙率和分形维数均能定量描述岩体裂隙的发育特征,顶板的裂隙发育程度对工作面前方支承压力有着显著影响,对于裂隙不发育顶板,支承压力影响范围和支承压力峰值随着采面的推进显著增加,而对于裂隙发育顶板,随工作面推进工作支承压力基本符合周期性显现规律,且支承压力峰值和影响范围相对较小.根据模拟结果提出了支承压力集中系数与裂隙率的关系模型,该模型能够较好的描述支承压力集中系数与裂隙率的关系.
Based on the Monte-Carlo method, a program for generating a network of discrete fractures was developed by using the fish language in UDEC, and the simulation of roof fissures was carried out. Based on the geological conditions of a working face, five numerical models of fractures with different developmental degrees , The influence of roof fracture development degree on bearing pressure of mining coal and rock mass is studied.The results show that both fracture volume and fractal dimension can quantitatively describe the development characteristics of rock mass fissure.The extent of roof fracture development has bearing pressure For the roof without cracks, the influence range of support pressure and the peak value of support pressure increase significantly with the advancement of mining face, while for roof with cracks, the working support pressure is basically in accordance with the regularity of appearance and the peak of support pressure And the influence range is relatively small.According to the simulation results, the relationship model between the support pressure concentration coefficient and the fracture rate is proposed, which can well describe the relationship between the support pressure concentration coefficient and the fracture rate.