模拟层状岩层样品失稳的冲击倾向性实验研究

发布时间：2018-04-01 17:10

本文选题：采矿工程　切入点：冲击矿压　出处：《岩石力学与工程学报》2017年S2期

【摘要】：为了弄清顶底板和煤体强度对煤岩系统冲击倾向性的影响以及三者之间的联系,探明静载条件下坚硬的顶底板能否引起冲击矿压。在实验室利用混凝土模拟8种不同强度的煤岩组合,利用MTS试验机在静载条件下对样品做单轴压缩试验,以动态破坏时间,单轴抗压强度和破坏时声音大小评估样品的冲击倾向性。实验结果表明:煤层决定了煤岩系统的强度与冲击倾向性,坚硬的顶底板可以增加软弱煤层的冲击倾向性,软弱的顶底板也可以减小坚硬煤层的冲击倾向性;顶底板对系统冲击倾向性的影响与煤体的性质紧密相关:当煤体软弱,坚硬底板能限制其变形,尤其是与坚硬顶板形成加持作用能显著提高系统冲击倾向性;当煤体坚硬,底板强度对系统冲击倾向性影响很小,顶板强度的增加能增强系统的冲击倾向性;当底板和煤体都软弱,顶板强度对系统冲击倾向性影响很小;在静载条件下,单纯坚硬的顶底板并不是引起冲击矿压的必要条件。
[Abstract]:In order to find out the influence of roof and coal body strength on the impact tendency of coal and rock system and the relation between them, It is proved whether the hard roof and bottom slab can cause the impact rock pressure under static load. In the laboratory, concrete is used to simulate 8 kinds of coal and rock combinations of different strength, and the uniaxial compression test of the sample under static load is carried out by using MTS tester, and the dynamic failure time is used. Uniaxial compressive strength and sound size during failure are used to evaluate the impact tendency of the samples. The experimental results show that the strength and impact tendency of coal seam system are determined by coal seam, and the strong roof and floor can increase the impact tendency of soft coal seam. Weak roof and floor can also reduce the impact tendency of hard coal seam, and the influence of roof and floor on system impact tendency is closely related to the properties of coal body: when coal body is weak, hard floor can limit its deformation, Especially, when the coal body is hard, the impact tendency of the system can be enhanced by the increase of the roof strength, and the influence of the strength of the bottom plate on the impact tendency of the system is very small when the coal body is hard, and the impact tendency of the system can be enhanced by the increase of the roof strength. When both the floor and coal body are weak, the roof strength has little effect on the impact tendency of the system, and under the static load condition, the simple hard roof and bottom slab is not the necessary condition to cause the impact rock pressure.
【作者单位】：中国矿业大学资源与安全工程学院;西弗吉尼亚大学采矿工程系;
【分类号】：TD324

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