星村煤矿深部1200m采区动静载叠加诱冲原理及应用研究

发布时间：2018-07-06 11:45

本文选题：冲击矿压 + 静载荷　；参考：《中国矿业大学》2015年硕士论文

【摘要】：星村煤矿属于千米深井,西翼三采区平均深度为1200m,最深的工作面达到了1300m。采深增加致使深部煤岩体应力水平随之升高,矿山压力显现更加剧烈和复杂,尤其是冲击矿压的频度和烈度不断增加。深部矿井自重应力大,受构造和采动影响之后产生的静载荷高,往往近处较小的震动或者远处较大的矿震就能诱发冲击。所以深部矿井由静载荷占主导,动载荷很大程度上起诱发冲击的作用,因此研究深部矿井冲击矿压发生原理对于保障煤矿深部安全开采具有重要意义。本文通过理论分析、现场实测、数值模拟等方式对星村煤矿深部采区静载荷的构成进行研究,并对深部矿井与浅部矿井动静载的区别进行分析,总结出深部载荷所独有的特点,据此进行相应的防治。对于动载荷,结合现场实践分析了矿震与冲击的主要区别,并理论分析了顶板破断、断层运动诱发的震动及其对冲击的影响。最后结合动静载叠加诱冲机理及深部动载荷和静载荷构成特点,分析深部“小动大静”、“大动远距”的冲击发生原理,并结合实际案例进行分析。深部矿井采深大造成自重应力高,受构造、采掘等因素影响导致静载荷远大于一般浅部矿井;对星村矿西翼三采区地应力进行观测,实测矿区各点垂直应力为31.3~31.6MPa,最大水平应力为67.9MPa,最大水平应力与垂直应力的比值约为2.1,构造应力作用强烈;采用FLAC3D数值模拟软件对3308工作面周围应力状态及回采中应力分布进行了模拟,3308工作面扩面期间、断层处应力集中,回采时工作前方应力叠加,静载荷进一步加大。冲击矿压与矿震是并存关系,每一次冲击矿压的发生都与岩体震动有关,但并非每一次岩体震动都会引发冲击矿压。本文对顶板破断、断层运动诱发的冲击进行分析,顶板初次来压、周期来压、见方期间工作面周围应力均会产生集中,同时顶板断裂产生的震动能量也达到最大,动静载峰值重叠极易诱发冲击;断层周围往往应力集中且断层破碎带煤岩破碎,巷道维护困难,工作面采动靠近断层20m以内,断层会造成工作面顶板急剧下沉、顶板断裂,顶板中积聚的弹性能突然释放形成高能矿震诱发冲击。本文对支护系统的抗冲能力进行了分析,星村煤矿支护系统所能抵抗的矿震能量等级为4.5~6.1k J/m2。根据动静载叠加诱冲机理,分析了星村煤矿3308工作面冲击矿压影响因素,对工作面冲击危险性进行了评价,提出了冲击矿压的日常及重点预防区域和治理措施,指导了星村煤矿西翼三采区3308工作面生产实际,取得了良好的效果。
[Abstract]:Xingcun coal mine belongs to a kilometer deep well, the average depth of the third mining area of the west wing is 1200 m, and the deepest working face reaches 1300 m. With the increase of mining depth, the stress level of deep coal and rock mass will increase, and the mine pressure will become more intense and complex, especially the frequency and intensity of rock burst. Because of the large gravity stress and the high static load caused by the structure and mining, the deep mine can be impacted by the smaller vibration near the mine or the bigger mine shock in the distance. So the deep mine is dominated by static load and the dynamic load plays an important role in inducing shock to a great extent. Therefore, it is of great significance to study the occurrence principle of rock burst in deep mine to ensure safe mining in deep coal mine. In this paper, the structure of static load in deep mining area of Xingcun Coal Mine is studied by means of theoretical analysis, field measurement and numerical simulation, and the difference between static and static load of deep mine and shallow mine is analyzed, and the unique characteristics of deep load are summarized. According to this, the corresponding prevention and cure were carried out. For the dynamic load, combined with the field practice, the main differences between the mine earthquake and the shock are analyzed, and the roof breaking, the vibration induced by the fault movement and its impact on the impact are theoretically analyzed. Finally, combined with the mechanism of static and static load superposition and the characteristics of deep dynamic load and static load, this paper analyzes the principle of shock generation of deep "small dynamic and large static" and "large moving distance", and analyzes the impact mechanism of deep "small moving large static" and "large moving distance", and analyzes it with practical cases. Under the influence of structure and excavation, the static load of deep mine is much larger than that of shallow mine, and the ground stress in the third mining area of the west wing of Xingcun Mine is observed. The vertical stress and the maximum horizontal stress are 31.3and 31.6MPa respectively, and the ratio of the maximum horizontal stress to the vertical stress is about 2.1. The tectonic stress is strong. The stress state around 3308 working face and the stress distribution in mining are simulated by using FLAC3D numerical simulation software. The stress concentration at fault is simulated during the expanding face of No. 3308 working face, and the stress superposition in front of work during mining, and the static load is further increased. The relation between rock shock and rock shock is coexisting. The occurrence of each impact rock pressure is related to rock mass vibration, but not every rock mass shock will lead to rock impact pressure. In this paper, the impact induced by roof breaking and fault movement is analyzed. The initial pressure of roof, periodic pressure and stress around the working face are all concentrated, and the vibration energy caused by roof fracture is also maximum. The peak value of static and static load is easy to induce shock, the stress around the fault is often concentrated and the coal and rock in the broken zone of the fault are broken, the maintenance of the roadway is difficult, the mining face is close to the fault within 20m, the fault will cause the roof of the face to sink sharply and the roof to break. The accumulated elastic energy in the roof suddenly releases to form a high-energy mine shock induced shock. In this paper, the impact resistance of the support system is analyzed. The earthquake energy grade of the support system in Xingcun coal mine is 4.5 ~ 6.1k / m ~ (2). According to the inductive mechanism of static and static load superposition, this paper analyzes the influence factors of impact rock pressure in No. 3308 face of Xingcun Coal Mine, evaluates the impact risk of working face, and puts forward the daily and key prevention areas and control measures of impact rock pressure. The production practice of No. 3308 working face in the third mining area of west wing of Xingcun Coal Mine has been guided, and good results have been obtained.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD324

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