建新煤矿高应力动压巷道围岩控制技术研究

发布时间：2018-01-22 03:54

本文关键词： 锚固失效动压巷道巷道变形控制方案设计　出处：《湖南科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着开采深度的增加,厚层软弱直接顶煤层高应力巷道在动压作用下常出现严重的围岩锚固失效现象,致使巷道剧烈变形,严重时会造成冲击矿压现象的出现,这必然会对矿井安全高效生产带来巨大的安全隐患,同时事故的发生也会造成重大的人员伤亡和经济损失。针对采动作用下的高应力厚层松软直接顶煤巷锚固支护失效难题,本文以建新煤矿主采的B4煤层212工作面顺槽地质条件和支护技术为背景,通过综合应用锚固失效理论分析、FLAC3D软件模拟及现场施工监测等技术手段,对高应力动压煤层巷道锚固失效进行研究。研究成果:(1)分析了高应力巷道围岩锚固失效及变形破坏机理,锚杆支护锚固的是破碎岩体,巷道维护状况就取决于破碎煤岩锚固体的力学性能,而锚固失效就是破碎煤岩锚固体在超前支承压力作用下二次破裂。(2)揭示了高应力作用下松软直接顶煤巷锚固支护失效及控制机理,顶板锚索失效主要表现为与顶板同步下移而不破断模式,锚杆的预紧力对锚固体力学特性产生重要影响。(3)运用数值模拟对深部高应力动压巷道围岩应力场、位移场及破坏场变化特征进行了模拟研究,巷道受开挖扰动影响,新掘巷道围岩内出现应力集中现象,巷道围岩变形程度较大,破坏程度较严重且随着时间推移继续加重。(4)从支护技术、巷道变形控制、锚杆和锚索的协调机制及施工工艺角度出发,进行了巷道支护加固方案及参数设计研究,提出了预应力桁架支护体系、锚杆(索)、钢带及锚网联合支护技术方案对煤巷变形破坏进行有效控制。(5)通过数值模拟及现场实测,在新支护方案下,巷道围岩应力集中程度显著降低,巷道围岩变形量明显降低,围岩破坏范围也明显减小,巷道围岩变形得到了有效控制。(6)对建新煤矿212工作面顺槽巷道锚固失效进行了分析并对巷道支护技术方案进行了优化设计,提出针对煤巷围岩控制的新技术,并取得了很好的控制变形效果,大大提高了矿井的生产效率,对深井高应力动压巷道围岩稳定性控制具有一定的借鉴意义。
[Abstract]:With the increase of mining depth high stress roadway of thick soft direct top coal seam often appears serious wall rock anchoring failure phenomenon under the action of dynamic pressure which results in severe deformation of roadway and the occurrence of rock burst phenomenon when serious. This will inevitably bring huge safety hidden danger to mine safety and efficient production. At the same time, the occurrence of accidents will also cause heavy casualties and economic losses. Based on the geological condition and supporting technology of No. 212 coal face in B4 coal seam of Jianxin coal mine, this paper analyzes the failure of Anchorage by comprehensive application of Anchorage theory. FLAC3D software simulation and site construction monitoring and other technical means. This paper studies the failure of roadway Anchorage in high stress dynamic pressure coal seam. The research result is: 1) the failure mechanism of surrounding rock Anchorage and deformation failure of high stress roadway is analyzed. The maintenance condition of roadway depends on the mechanical properties of rock and coal bolt. The Anchorage failure is the secondary rupture of rock anchors under the action of leading support pressure. It reveals the failure and control mechanism of anchoring support in soft direct roof roadway under high stress. The failure of roof anchor cable mainly shows that it moves down synchronously with the roof and does not break the mode. The stress field, displacement field and failure field of deep high stress roadway surrounding rock are simulated by numerical simulation. Under the influence of excavation disturbance, stress concentration phenomenon appears in the surrounding rock of new excavation roadway, the surrounding rock deformation degree of roadway is larger, the destruction degree is more serious, and with the time goes on, the stress concentration phenomenon appears in the surrounding rock of new excavation roadway. From the angle of roadway deformation control, coordination mechanism of anchor rod and anchor cable and construction technology, the design of roadway supporting scheme and parameters is studied, and the pre-stressed truss support system, anchor rod (cable) is put forward. Through numerical simulation and field measurement, under the new support scheme, the degree of stress concentration in surrounding rock of roadway is significantly reduced. The deformation of roadway surrounding rock is obviously reduced, and the damage range of surrounding rock is also obviously reduced. Effective control of surrounding rock deformation of roadway is obtained.) Anchorage failure of roadway in No. 212 face of Jianxin Coal Mine is analyzed and the technical scheme of roadway support is optimized. A new technology for controlling surrounding rock of coal roadway is put forward, and good deformation control effect is obtained, which greatly improves the production efficiency of coal mine, and has certain reference significance for the stability control of surrounding rock of roadway with high stress in deep mine.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD353

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