泥质岩体微观分子位态变化引发巷道失稳机理研究
发布时间：2018-08-30 16:29
【摘要】：中国煤矿每年新掘井巷工程量约25000 km,巷道顶板长期安全保障尤为重要,统计两淮等矿区40余个矿井28起冒顶事故,泥质巷道顶板锚固失稳垮冒比例达46.4%,多发生在断层、破碎带、软弱夹层、水化泥岩等特殊条件,当岩层吸水泥化,煤岩层完整程度受到损伤时,围岩强度随时间出现显著衰减,巷道维护难度剧增,泥质巷道锚固失稳致灾机理、关键影响因素分析与安全控制成为煤矿井巷支护棘手难题之一。本文以淮北矿区涡北煤矿8106机巷为工程背景,采用理论分析、数值模拟、实验室实验和现场观测相结合的方法,建立了泥岩变形的力学特性及其本构方程;分析了8106机巷泥岩的主要粘土成分类型及浸水之后微观结构变化特征;进行了高岭石泥岩颗粒表面水化作用的分子动力学模拟;并在现场进行了预注浆等围岩强化工作,有效控制巷道变形。得到如下主要结论:(1)阐明了泥岩的基本物理力学性质,并且根据实验和8106机巷等现场的具体情况,进行泥岩含水量变化的实验,归纳出泥岩的内聚力C、内摩擦角φ与含水量W的关系。通过运用弹塑性理论、弹粘性理论建立了一个本构方程以用来反映泥岩出现非线性体积应变的本质关系。(2)针对泥质裂隙岩体水化过程中微观结构(包括胶结、颗粒、孔隙等)的演变特征,分别进行了不同岩样的浸水-风干实验、不同岩样不同含水状态下的SEM观测实验,从微观角度分析了泥岩浸水条件下的典型结构变化特征。(3)运用Material Studios(MS)软件进行了高岭石颗粒表面水化作用的分子动力学模拟,分析了高岭石泥岩遇水与典型以蒙脱石为代表的泥岩遇水泥化的作用机理,得出了高岭石等粘粒遇到水时,虽然晶胞之间不允许进入水分子,但其粘粒表面具有游离价原子和离子,这些原子或离子具有静电引力,在粘土表面形成静电引力场。同时,水分子是偶极体,一端为正电荷,一端带负电荷,可被静电引力所吸引,得到粘粒表面附近的水分子紧密地、整齐地排列起来的结论。(4)在淮北矿区涡北煤矿8106机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,有效保障了巷道的后期使用,取得了良好的经济与社会效益。
[Abstract]:It is particularly important to ensure the long-term safety of roadway roof in 25000 km, roadway in China coal mine every year. Statistics show that 28 roof caving accidents occurred in more than 40 mines in Lianghuai mining area, and the ratio of roof Anchorage instability of muddy roadway was 46.4%, which mostly occurred in fault zone and broken zone. Under special conditions, such as weak intercalation and hydrated mudstone, when the rock layer is cemented and the integrity of coal and rock stratum is damaged, the strength of surrounding rock decreases significantly with time, the maintenance difficulty of roadway increases dramatically, and the mechanism of rock anchoring and instability of muddy roadway leads to disaster. The analysis of key influencing factors and safety control has become one of the thorny problems in coal mine roadway support. In this paper, the mechanical properties and constitutive equation of mudstone deformation are established with the method of theoretical analysis, numerical simulation, laboratory experiment and field observation. In this paper, the main clay composition types and microstructure change characteristics of 8106 Ji-xiang mudstone are analyzed, the molecular dynamics simulation of the hydration of kaolinite mudstone particles is carried out, and the surrounding rock strengthening work such as pre-grouting is carried out in the field. Effective control of roadway deformation. The main conclusions are as follows: (1) the basic physical and mechanical properties of mudstone are elucidated, and according to the experimental results and the concrete situation of 8106 machine lane, the water content of mudstone is tested. The relationship between cohesion C, friction angle 蠁 and water content W of mudstone is summarized. By using elastic-plastic theory, a constitutive equation is established to reflect the essential relationship of nonlinear volumetric strain in mudstone. (2) aiming at the microstructure of muddy fractured rock mass during hydration (including cementation, particle, etc.) The evolution characteristics of pore, etc., were studied by soaking and air drying experiments of different rock samples, and SEM observation experiments of different rock samples under different water-bearing states. The characteristics of typical structural changes in mudstone flooding were analyzed from the microscopic point of view. (3) the molecular dynamics simulation of the surface hydration of kaolinite particles was carried out by using Material Studios (MS) software. The mechanism of water contact between kaolinite mudstone and typical clay rock represented by montmorillonite is analyzed. It is concluded that when kaolinite and other clay meet water, water molecules are not allowed between units. However, the clay surface has free valence atoms and ions, and these atoms or ions have electrostatic force, forming electrostatic gravitational field on the clay surface. At the same time, the water molecule is a dipole, with a positive charge at one end and a negative charge at the other end, which can be attracted by electrostatic force. Conclusion of neatly arranged. (4) validation research and industrial test of roadway treatment in 8106 machine roadway of Huai Bei Coal Mine were carried out. The roadway maintenance control effect was good, which indicated that the control technology was selected properly. Effective protection of the late use of roadways, and achieved good economic and social benefits.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD322.4
本文编号：2213632
[Abstract]:It is particularly important to ensure the long-term safety of roadway roof in 25000 km, roadway in China coal mine every year. Statistics show that 28 roof caving accidents occurred in more than 40 mines in Lianghuai mining area, and the ratio of roof Anchorage instability of muddy roadway was 46.4%, which mostly occurred in fault zone and broken zone. Under special conditions, such as weak intercalation and hydrated mudstone, when the rock layer is cemented and the integrity of coal and rock stratum is damaged, the strength of surrounding rock decreases significantly with time, the maintenance difficulty of roadway increases dramatically, and the mechanism of rock anchoring and instability of muddy roadway leads to disaster. The analysis of key influencing factors and safety control has become one of the thorny problems in coal mine roadway support. In this paper, the mechanical properties and constitutive equation of mudstone deformation are established with the method of theoretical analysis, numerical simulation, laboratory experiment and field observation. In this paper, the main clay composition types and microstructure change characteristics of 8106 Ji-xiang mudstone are analyzed, the molecular dynamics simulation of the hydration of kaolinite mudstone particles is carried out, and the surrounding rock strengthening work such as pre-grouting is carried out in the field. Effective control of roadway deformation. The main conclusions are as follows: (1) the basic physical and mechanical properties of mudstone are elucidated, and according to the experimental results and the concrete situation of 8106 machine lane, the water content of mudstone is tested. The relationship between cohesion C, friction angle 蠁 and water content W of mudstone is summarized. By using elastic-plastic theory, a constitutive equation is established to reflect the essential relationship of nonlinear volumetric strain in mudstone. (2) aiming at the microstructure of muddy fractured rock mass during hydration (including cementation, particle, etc.) The evolution characteristics of pore, etc., were studied by soaking and air drying experiments of different rock samples, and SEM observation experiments of different rock samples under different water-bearing states. The characteristics of typical structural changes in mudstone flooding were analyzed from the microscopic point of view. (3) the molecular dynamics simulation of the surface hydration of kaolinite particles was carried out by using Material Studios (MS) software. The mechanism of water contact between kaolinite mudstone and typical clay rock represented by montmorillonite is analyzed. It is concluded that when kaolinite and other clay meet water, water molecules are not allowed between units. However, the clay surface has free valence atoms and ions, and these atoms or ions have electrostatic force, forming electrostatic gravitational field on the clay surface. At the same time, the water molecule is a dipole, with a positive charge at one end and a negative charge at the other end, which can be attracted by electrostatic force. Conclusion of neatly arranged. (4) validation research and industrial test of roadway treatment in 8106 machine roadway of Huai Bei Coal Mine were carried out. The roadway maintenance control effect was good, which indicated that the control technology was selected properly. Effective protection of the late use of roadways, and achieved good economic and social benefits.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD322.4
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