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运用ＭＳＳ－３００型真三轴压力试验机对忻州窑矿放顶煤工作面的大煤样试件进行了压裂实验研究，运用分形理论探讨了煤样的裂隙演化规律，为研究放顶煤工作面顶煤的破裂演化规律及采取人工弱化顶煤措施提供了必要的理论依据。探讨了放顶煤采场有关数值计算中力学参数合理选取的新途径。
Fracturing experiments were carried out on a large coal sample of caving face in Xinzhou Kiln using MSS-300 true triaxial compression testing machine. Fractal theory of fractal theory was used to study the evolution of fractures of coal samples. The evolution law of the top coal rupture and the measures of artificial weakening top coal provide the necessary theoretical basis. The new way of reasonable selection of mechanical parameters in the numerical calculation of caving coal caving is discussed.