坚硬顶板初次垮落中的能量转化及释放研究

发布时间：2018-07-31 06:05

【摘要】：为了研究坚硬顶板岩梁的破裂及演化规律,基于能量法分析坚硬顶板岩梁初次垮落时的能量种类及其转化。应用弹-脆性双支梁模型分析基本顶岩梁破裂过程中能量的种类,并计算储存积聚的能量和释放的能量。储存积聚的弹性势能一部分转化为辐射能和热能,这部分能量等价于岩石破裂克服抗拉强度所耗散的能量,另一部分弹性势能将转化为破裂岩块所释放的动能。根据能量守恒定律,给出基本顶单一裂纹破裂的能量判据,并计算能量释放率。通过分析可知,基本顶岩梁储存积聚的弹性势能随上覆岩层重量及开采距离的增大而增大,随基本顶高度的增加而减小;能量释放率与岩梁的抗拉强度、岩梁的厚度成正比,与裂纹扩展速度的平方成正比。
[Abstract]:In order to study the fracture and evolution of hard roof slate beams, the energy types and their transformation during the first collapse of hard roof slate beams were analyzed based on the energy method. The elastic brittle double beam model is used to analyze the energy types in the rupture process of the basic top rock beam, and the accumulated energy and the released energy are calculated. Some of the accumulated elastic potential energy is converted into radiation energy and heat energy, which is equivalent to the energy consumed by rock rupture to overcome the tensile strength, and the other part of elastic potential energy will be converted into the kinetic energy released by the fractured rock mass. According to the law of conservation of energy, the energy criterion for the rupture of the basic top single crack is given, and the energy release rate is calculated. Through analysis, it can be concluded that the elastic potential energy accumulated by the basic roof beam increases with the increase of the overburden weight and the mining distance, and decreases with the increase of the basic top height, and the energy release rate is directly proportional to the tensile strength of the rock beam and the thickness of the rock beam. It is proportional to the square of the crack growth speed.
【作者单位】：辽宁工程技术大学矿业技术学院;辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金青年基金资助(51304108);国家自然科学基金面上项目资助(51274110) 国家自然基金煤炭联合基金重点项目资助(U1361211)
【分类号】：TD327.2

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