倾斜煤层巷道刚柔嵌合锚注支护技术研究

发布时间：2018-04-17 08:56

本文选题：倾斜煤层 + 刚柔嵌合锚注支护　；参考：《太原理工大学》2015年硕士论文

【摘要】：随着采矿技术的提高和煤炭机械的快速发展，煤炭开采的强度越来越大，使得赋存条件较好的煤炭储量逐渐减少，煤炭企业对于煤炭的开采逐渐转向急倾斜煤层和深部地质条件较为复杂的煤层。我国大倾角煤层的煤炭储量约占全国煤炭储量的15%~20%，储量丰富，并且煤质较好，具有很高的开采价值。本文结合长沟峪煤矿-410m水平石门掘进穿过倾斜煤层的工程实例，通过理论研究、相似模拟、数值模拟、工程监测等方法进行了以下主要研究：（1）通过理论研究得出大倾角煤层巷道变形破坏的影响因素：大倾角煤层巷道由于其围岩结构与岩性的非对称性，巷道围岩层理、节理和裂隙发育快，层间粘结力弱甚至无粘结力，导致巷道的非对称变形破坏，致碎胀压力大，且易发生煤炮。锚杆所支护方案难以满足支护要求，因此在注浆机理的基础上提出刚柔嵌合锚注支护方案。（2）对取自长沟峪煤矿-410m水平煤样进行注浆模拟试验和强度试验，确定刚性注浆浆液配合比和注浆参数，对煤样水泥试块注浆前后的抗压强度对比分析。（3）采用FLAC3D软件对不同支护方式下的巷道进行数值模拟，对锚网喷支护和刚柔嵌合锚注支护两种条件下屈服破坏范围、垂直应力分布、水平应力分布、垂直位移分布、水平位移分布等进行模拟分析。（4）本文成果应用于长沟峪煤矿-410m水平石门，经对巷道收敛情况等监测分析，，验证了刚柔嵌合锚注支护结构保证了急倾斜煤层巷道的稳定性，满足了巷道安全生产的要求，为水平岩巷穿越倾斜煤层巷道的安全生产起到了借鉴作用。
[Abstract]:With the improvement of mining technology and the rapid development of coal machinery, the intensity of coal mining is increasing, which makes the coal reserves with better conditions gradually decrease.The mining of coal in coal enterprises has gradually turned to steep inclined coal seam and coal seam with complex geological conditions.The coal reserves of large inclined coal seams in China account for 15% 20% of the national coal reserves, which are rich in reserves and of good coal quality, so they are of high mining value.Combined with the engineering example of -410m horizontal Shimen driving through inclined coal seam in Changgouyu Coal Mine, the following main research methods are carried out through theoretical research, similarity simulation, numerical simulation, engineering monitoring and so on.1) through the theoretical research, the influence factors of roadway deformation and failure in large inclined coal seam are obtained: because of the asymmetry of surrounding rock structure and lithology, the bedding, joint and crack development of roadway surrounding rock is fast.The interlayer adhesion is weak or even no adhesion, which leads to asymmetric deformation and destruction of roadway, resulting in large breaking and expanding pressure, and coal cannon is easy to occur.The bolting scheme is difficult to meet the requirement of support, so a rigid flexible chimeric bolting support scheme is put forward on the basis of grouting mechanism.(2) the grouting simulation test and strength test were carried out on the coal samples taken from Changgouyu coal mine at -410m level, and the mixture ratio and grouting parameters of rigid grouting were determined, and the compressive strength of the coal sample cement test blocks before and after grouting were compared and analyzed.(3) numerical simulation of roadway under different supporting modes is carried out by using FLAC3D software. The yield failure range, vertical stress distribution, horizontal stress distribution and vertical displacement distribution of bolt-mesh shotcreting support and rigid flexible interlocking bolt-grouting support are studied.The horizontal displacement distribution is simulated and analyzed.This paper is applied to Changgouyu coal mine -410m horizontal Shimen. By monitoring and analyzing the convergence of roadway, it is proved that the rigid and flexible chimeric bolt-grouting support structure ensures the stability of steep seam roadway and meets the requirement of roadway safety production.It can be used as a reference for the safety production of horizontal rock roadway through inclined coal seam roadway.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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