金宝屯煤矿深井高应力软岩巷道支护技术研究

发布时间：2018-05-21 01:29

本文选题：深井 + 高应力　；参考：《中国矿业大学》2015年硕士论文

【摘要】：随着开采深度的增加,深井高应力软岩巷道的支护与维护问题已经成为国内外地下工程支护的难题之一,单一的主动支护、被动支护的形式已无法有效控制巷道剧烈变形和持续蠕变。传统锚杆支护技术在高应力软岩巷道中难以形成稳定、有效的承载结构;而被动支护形式,虽然能够通过其护表作用显著提高浅部围岩稳定性,但无法适应围岩的强烈变形,同时难以发挥深部稳定岩体的承载能力,高应力环境下出现大变形屈服破坏现象。因此,本文根据国内外深井高应力软岩巷道的研究现状和金宝屯煤矿N201工作面地质条件,综合采用理论分析、工程类比、数值模拟和现场工业性试验等方法,研究了深井高应力软岩巷道的支护技术,确定了被动支护与主动支护相结合的锚网喷架棚联合支护技术方案及参数,并将研究成果成功应用到工程实践。主要研究内容为:(1)现场调查相邻工作面--N203工作面皮带巷与回风巷地质采矿条件及其变形破坏特征,指出了巷道变形破坏的主要影响因素为:煤层埋藏深,研究巷道埋深800m,原岩应力大;巷道围岩强度低,顶底板均为较厚泥岩,高应力下变形大,底鼓现象突出;围岩浅部变形大,原始被动支护方案无法控制巷道围岩的大变形;(2)针对金宝屯煤矿N201工作面皮带巷与运输巷条件(其中皮带巷相邻上一工作面采空区,回风巷为两侧实体煤的巷道)采用FLAC3D数值计算软件对皮带巷护巷煤柱合理留设宽度进行了分析,得到掘巷期间巷道围岩非对称破坏特征,基于现场实测和模拟分析确定皮带巷采用沿空掘巷,煤柱宽度为8m;(3)依据巷道变形破坏特征及理论分析,提出锚杆支护+锚索+注浆加固+U型钢支架架棚支护的锚网喷架棚联合支护技术,分析了该支护技术的机理,应用FLAC3D数值计算软件对巷道支护参数进行了数值模拟分析并确定了支护参数;(4)在金宝屯N201工作面回风巷与皮带巷进行了工程试验,有效控制了两条巷道的剧烈变形和持续蠕变,并且相比较原支护需要多次翻修U型钢支架的设计方案,该支护方案简单、易行,具有较高的推广应用价值。
[Abstract]:With the increase of mining depth, the support and maintenance of soft rock roadway with high stress in deep well has become one of the difficult problems of underground engineering support at home and abroad. The form of passive support can not effectively control the severe deformation and continuous creep of roadway. Traditional bolting technique is difficult to form a stable and effective bearing structure in high stress soft rock roadway, while passive support can obviously improve the stability of shallow surrounding rock, but it can not adapt to the strong deformation of surrounding rock. At the same time, it is difficult to give full play to the bearing capacity of deep stable rock mass, and the phenomenon of large deformation and yield failure occurs under high stress environment. Therefore, according to the present research situation of deep and high stress soft rock roadway at home and abroad and the geological conditions of N201 face in Jinbaotun Coal Mine, the methods of theoretical analysis, engineering analogy, numerical simulation and field industrial test are adopted in this paper. In this paper, the supporting technology of soft rock roadway with high stress in deep well is studied, and the technical scheme and parameters of combination of passive support and active support are determined, and the research results are successfully applied to engineering practice. The main research contents are as follows: 1) investigation of geological mining conditions and deformation failure characteristics of belt roadway and return air roadway in adjacent face N203 working face. It is pointed out that the main influencing factors of roadway deformation and failure are: deep buried coal seam. The research roadway buried deep 800 m, the original rock stress is big, the surrounding rock strength of the roadway is low, the roof and floor plate are thick mudstone, under the high stress the deformation is big, the bottom heave phenomenon is prominent, the surrounding rock shallow deformation is big, The original passive support scheme can not control the large deformation of surrounding rock of roadway) aiming at the condition of belt roadway and transportation roadway in N201 face of Jinbaotun Coal Mine (among them, the goaf of the upper face adjacent to the belt roadway), The FLAC3D numerical calculation software is used to analyze the reasonable retaining width of coal pillar in belt roadway, and the asymmetric failure characteristics of surrounding rock of roadway during roadway excavation are obtained. Based on the field measurement and simulation analysis, it is determined that the belt roadway should be driven along the gob, the width of coal pillar is 8 m ~ (3) according to the characteristics of roadway deformation and failure and theoretical analysis, This paper puts forward the combined support technology of bolting, mesh, shotcreting and shed for bolting and bolting cable grouting to strengthen U steel support frame and shed, and analyzes the mechanism of this support technology. The numerical simulation and analysis of the supporting parameters of the roadway and the determination of the supporting parameters are carried out by using the FLAC3D software. The engineering tests are carried out in the return air roadway and belt roadway of Jinbaotun N201 face, which effectively control the violent deformation and continuous creep of the two roadways. Compared with the original support, it is necessary to renovate the design scheme of U-shaped steel support many times. This support scheme is simple, easy to implement and has high value of popularization and application.
【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】：TD353

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