渗水泥化巷道失稳机理与安全控制对策
发布时间：2018-08-03 17:50
【摘要】：本文针对淮北矿区高应力、围岩松散破碎、泥质岩性、受水影响显著等复杂地质条件下的渗水泥化巷道围岩稳定控制技术难题开展了深入研究,通过深入细致的工程地质调研,结合实验室试验、分子模拟及数值计算,分析了高承压水侵入巷道失稳原因,揭示了浸水泥岩泥化流变演化规律,得到了渗水泥化巷道失稳机理,研发了适用泥化巷道围岩控制的安全控制对策,研究成果如下:(1)通过深入细致的现场调研,发现巷道是在泥质软岩、地板承压水及各种应力扰动的共同作用下出现围岩泥化流变,最终导致巷道渗流失稳,其失稳变形本质上是围岩渗流场、应力场、损伤场三者相互耦合的结果,而渗流水对围岩的侵蚀是巷道变形破坏的关键因素。(2)通过扫描电镜与X射线衍射仪对典型泥岩的微观结构与物质组成进行分析,并借助Materials Studio(简称MS)软件建立了蒙脱石的双晶胞结构模型,揭示了蒙脱石吸附水分子形成1、2、3层饱和水分子层的水化过程,结合蒙脱石型泥岩不同浸水程度的微观结构变化,研究了随着粘土矿物水化程度加强,泥岩微观颗粒脱落、裂隙增加,致使泥岩在宏观上出现泥化流变破坏现象的过程。(3)运用MS软件forcite模块对吸附1、2、3层饱和水分子层的蒙脱石模型进行分子能量优化,发现蒙脱石分子模型多面体结构发生不规则变化,模型总能量大幅度下降,形成能量最小化结构体系,致使泥岩力学性能降低直至丧失力学强度,直接导致了泥岩微观结构发生破坏,最终形成无强度的泥化混合物。(4)采用数值模拟手段研究了渗水泥化巷道位移变化规律,发现泥化巷道开挖后迅速发生变形,顶底板及两帮移近量达到1500mm,巷道净断面面积缩小50%,泥化围岩根本无法维持巷道稳定。(5)针对渗水泥化巷道失稳机理,制定一套疏水降压、强化围岩及构造高强度支护体系的安全控制对策,其本质在于疏导承压水的基础上,置换原有的泥化围岩为混凝土墙体,并配以注浆手段不断提高泥岩自身整体强度和稳定性,从而构建多喷浆层、高度密贴岩面的强韧封层结构,形成巷道支护圈体。(6)在淮北矿区朱仙庄煤矿Ⅱ水平皮带机大巷开展了渗水泥化巷道治理的验证研究和工业性试验,巷道维控效果良好,表明控制技术选用得当,有效保证了巷道的正常使用,取得了良好的经济与社会效益。该论文有图50幅,表6个,参考文献90篇。
[Abstract]:In this paper, the technical problems of controlling surrounding rock stability of cemented roadway under complex geological conditions, such as high stress, loose broken surrounding rock, muddy lithology and significant influence by water, are studied deeply, and through deep and meticulous engineering geological investigation, the paper makes a thorough research on the stability control of surrounding rock of cemented roadway in Huaibei mining area. Combined with laboratory test, molecular simulation and numerical calculation, the causes of instability of high pressure water intrusion roadway are analyzed, and the rheological evolution law of mudstone soaking is revealed, and the mechanism of instability of cemented roadway is obtained. The research results are as follows: (1) through the thorough and detailed field investigation, it is found that the roadway is in the muddy soft rock. Under the joint action of floor confined water and various stress disturbances, the mudding rheology of surrounding rock appears, which eventually leads to the seepage instability of roadway, which is essentially the result of coupling of surrounding rock seepage field, stress field and damage field. The erosion of surrounding rock by seepage water is the key factor of roadway deformation and failure. (2) the microstructure and material composition of typical mudstone are analyzed by scanning electron microscope and X-ray diffractometer. The double cell structure model of montmorillonite is established by means of Materials Studio (MS) software. The hydration process of montmorillonite adsorbent water molecule forming 1 ~ 2 ~ 2 ~ 3 layer saturated water molecular layer is revealed, and the microstructure changes of montmorillonite mudstone with different degree of water immersion are combined. With the enhancement of hydration degree of clay minerals, the microscopic particles of mudstone fall off and the cracks increase. The process of mudding rheological failure occurred in mudstone macroscopically. (3) using MS software forcite module to optimize the molecular energy of montmorillonite model for adsorbing 1 / 2 layer saturated water molecular layer. It is found that the polyhedron structure of the montmorillonite molecular model changes irregularly, the total energy of the model decreases greatly, and the energy minimization structure system is formed, which results in the decrease of the mechanical properties of mudstone and even the loss of the mechanical strength. It leads directly to the destruction of mudstone microstructure and finally to the formation of non-strength mudding mixture. (4) the displacement law of cemented roadway is studied by numerical simulation, and it is found that the mudstone roadway is rapidly deformed after excavation. The roof and bottom plate and two sides move closer to 1500 mm, the net section area of roadway is reduced by 50%, and the mudded surrounding rock can not maintain the stability of roadway. (5) according to the mechanism of instability of cemented roadway, a set of hydrophobic depressurization is established. To strengthen the safety control measures of surrounding rock and structural high strength support system, its essence lies in replacing the original mudded wall rock with concrete wall on the basis of dredging confined water, and continuously improving the overall strength and stability of mudstone itself with grouting means. Thus, the strong and tough sealing structure of multi-jet layer and highly dense rock surface is constructed, and the supporting ring of roadway is formed. (6) in the roadway of level 鈪，
本文编号：2162505
[Abstract]:In this paper, the technical problems of controlling surrounding rock stability of cemented roadway under complex geological conditions, such as high stress, loose broken surrounding rock, muddy lithology and significant influence by water, are studied deeply, and through deep and meticulous engineering geological investigation, the paper makes a thorough research on the stability control of surrounding rock of cemented roadway in Huaibei mining area. Combined with laboratory test, molecular simulation and numerical calculation, the causes of instability of high pressure water intrusion roadway are analyzed, and the rheological evolution law of mudstone soaking is revealed, and the mechanism of instability of cemented roadway is obtained. The research results are as follows: (1) through the thorough and detailed field investigation, it is found that the roadway is in the muddy soft rock. Under the joint action of floor confined water and various stress disturbances, the mudding rheology of surrounding rock appears, which eventually leads to the seepage instability of roadway, which is essentially the result of coupling of surrounding rock seepage field, stress field and damage field. The erosion of surrounding rock by seepage water is the key factor of roadway deformation and failure. (2) the microstructure and material composition of typical mudstone are analyzed by scanning electron microscope and X-ray diffractometer. The double cell structure model of montmorillonite is established by means of Materials Studio (MS) software. The hydration process of montmorillonite adsorbent water molecule forming 1 ~ 2 ~ 2 ~ 3 layer saturated water molecular layer is revealed, and the microstructure changes of montmorillonite mudstone with different degree of water immersion are combined. With the enhancement of hydration degree of clay minerals, the microscopic particles of mudstone fall off and the cracks increase. The process of mudding rheological failure occurred in mudstone macroscopically. (3) using MS software forcite module to optimize the molecular energy of montmorillonite model for adsorbing 1 / 2 layer saturated water molecular layer. It is found that the polyhedron structure of the montmorillonite molecular model changes irregularly, the total energy of the model decreases greatly, and the energy minimization structure system is formed, which results in the decrease of the mechanical properties of mudstone and even the loss of the mechanical strength. It leads directly to the destruction of mudstone microstructure and finally to the formation of non-strength mudding mixture. (4) the displacement law of cemented roadway is studied by numerical simulation, and it is found that the mudstone roadway is rapidly deformed after excavation. The roof and bottom plate and two sides move closer to 1500 mm, the net section area of roadway is reduced by 50%, and the mudded surrounding rock can not maintain the stability of roadway. (5) according to the mechanism of instability of cemented roadway, a set of hydrophobic depressurization is established. To strengthen the safety control measures of surrounding rock and structural high strength support system, its essence lies in replacing the original mudded wall rock with concrete wall on the basis of dredging confined water, and continuously improving the overall strength and stability of mudstone itself with grouting means. Thus, the strong and tough sealing structure of multi-jet layer and highly dense rock surface is constructed, and the supporting ring of roadway is formed. (6) in the roadway of level 鈪，
本文编号：2162505
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