口孜东矿11-2煤巷道顶板离层临界值确定

发布时间：2018-12-29 21:09

【摘要】：在我国因顶板事故引起的伤亡占所有事故很大的比例,随着煤矿的开采向深部发展,复合顶板在我国各大矿区普遍存在,因此,掌握巷道复合顶板的变形规律是十分必要的。尤其是确定用于顶板监测的离层临界值,确保复合顶板的稳定性。结合典型的现场的巷道复合顶板,本论文综合大量现场实测、实验室测试等方法,围绕顶板离层关键层确定及离层临界值的具体数值两个关键问题,分别对关键层对顶板稳定性的影响及使用关键层的概念确定复合巷道顶板离层临界值进行确定。综合关键层的离层值及非关键层的离层值得出复合顶板锚固区内外的离层值。通过在同一断面使用多个测点确定离层的发展规律,得出更合理的判断稳定标准;使用钻孔摄像以及地质取芯确定巷道复合顶板的岩层分布及各岩层的岩性的;采用数值模拟的方法得出离层较大的范围;使用现场实测的方法对顶板进行监测,确定巷道顶板易于破坏的关键位置;使用多点位移计对关键层以及各个非关键层的离层进行监测,得出各个离层的数值,综合得出锚固区内外的离层临界值;使用钻孔摄像仪对离层发展实现可视化的观测,验证顶板离层的发展状况。通过以上的研究得出:①该巷道所处位置的地质条件复杂,顶板易出现顶板事故,因此确定合理的临界值对巷道顶板进行监测是很必要的。②同一断面的多位置的监测结果显示,对于深部巷道的临界值仅仅是取巷道中部的离层数值是不尽合理的,应该以巷道顶板的离层范围达到巷道宽度的一半为标准,此时巷道的离层发展是可控的,并且可以得出该判据是偏安全的。对于类似于研究对象类似的顶板可以采用同样的判据。③巷道离层的发展早期是关键层的破坏为主,随后非关键层的离层值会逐渐变大,通过数值模拟结合现场监测可以得出关键层及非关键层的离层值,综合得知11-2煤巷道锚固区内离层临界值为15mm,锚固区外的临界值为20mm。④矿上记录的锚固区内外的离层数值,可以得出临界值的确定是合理的,满足巷道顶板稳定的要求。使用钻孔摄像记录仪对顶板离层进行两次记录,观察复合顶板离层的发展,直观验证离层发展状况。图37表7参48
[Abstract]:In our country, the casualties caused by roof accidents account for a large proportion of all accidents. With the development of coal mining to the deep, composite roof is widely existed in every mining area of our country. Therefore, it is very necessary to master the deformation law of roadway composite roof. In particular, the critical value of separation layer for roof monitoring is determined to ensure the stability of composite roof. Combined with typical roadway composite roof, this paper synthesizes a large number of field measurement, laboratory test and other methods, focusing on two key issues: the determination of the critical layer and the specific value of the critical value of the separation layer. The influence of key layer on roof stability and the critical value of composite roadway roof separation are determined by using the concept of key layer. It is necessary to synthesize the separation values of critical layer and non-critical layer, and to give the value of dissociation inside and outside the Anchorage area of composite roof. By using multiple measuring points in the same section to determine the development law of the separated strata, a more reasonable criterion for judging stability is obtained, and the distribution of rock strata and the lithology of each rock layer are determined by using borehole camera and geological coring. The method of numerical simulation is used to obtain the large range of the separated layer, and the method of field measurement is used to monitor the roof to determine the key position where the roof of roadway is liable to be destroyed. Multi-point displacement meter is used to monitor the key layer and each non-critical layer, the value of each layer is obtained, and the critical value of the separated layer inside and outside the Anchorage area is obtained synthetically. Borehole camera is used to visualize the development of the separation layer to verify the development of the roof layer. Through the above research, it is concluded that: 1 the geological conditions of the location of the roadway are complex, the roof is prone to roof accidents, Therefore, it is necessary to determine a reasonable critical value to monitor the roof of the roadway. 2 the monitoring results of the multi-position of the same section show that the critical value of the deep roadway is only the value of the free layer in the middle of the roadway. It should be regarded as the standard that the roof of the roadway should reach half of the width of the roadway, and the development of the roadway is controllable, and it can be concluded that the criterion is relatively safe. For the roof similar to the research object, the same criterion can be used. 3 the early stage of roadway separation is the destruction of key layer, and then the value of non-critical layer will gradually increase. Through numerical simulation combined with field monitoring, the critical values of critical and non-critical layers can be obtained, and the critical value of separation layer in Anchorage zone of 11-2 coal roadway is 15mm. The critical value outside the anchoring area is the value of the separated layer inside and outside the anchoring area recorded on the 20mm.4 mine. It can be concluded that the determination of the critical value is reasonable and meets the requirement of roadway roof stability. The separation layer of the roof was recorded twice by using the borehole camera to observe the development of the separation layer of the composite roof, and to verify the development of the separation layer intuitively. Figs 37, tables 7, refs 48
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD327.2

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