| The island coal face is refers to the preparation of mining coal face around are goaf or face along the groove on both sides are working face goaf. It is called an island coal face mining that in the working face of coal mining. Different from other mining working face, the working face mine pressure appear obvious fan two lane, support pressure is bigger, the roof is not easy to control, and in the process of mining need to increase the two lane maintenance work. Now, how to solve the island coal face the pressure of the two lane is a popular topic.Large mining height are broken fully mechanized technology (namely large mining height are broken once mining thickness comprehensive mechanized coal mining method) is the important technical method to the construction of high production and efficiency mine in our country. Since the1980s, the technology obtained the rapid development, and many mines got very good application and popularization in our country. But large mining height appeared mine pressure regularity and the motion law of stope roof has its particularity, because both surrounding rock movement range and main roof from the fracture of the beam are big, make the working face of large mining height are broken lateral and advance support pressure, and fractured zone of overlying strata, coal caving height and wall piece for degree and so on are all changes great. Also, with the wide application of the technology of roadway protection coal pillar, the stability of the small coal pillar has become an important factor, the stability of the roadway, especially the large mining height are broken small coal pillar directly affects the normal production of working face and ensure safety. From the current actual situation of large mining height are broken small pillar extraction roadway surrounding rock control still exist a lot of security problems that have not solved effectively, which restrict the further development of large mining height are broken compound mining technology, therefore, the study of large mining height are broken small pillar extraction roadway surrounding rock control is also a popular topic.In view of the hot topic above, The paper, san yuan nan yao xiao chang coal mine’30222face small pillar extraction roadway surrounding rock control of the engineering background. First of all, on-the-spot investigation and collect the nan yao xiao chang coal’30222working face of further analyses the distribution characteristics of the surrounding rock and the physical and mechanical characteristic; Second, the isolated island working face are analyzed theoretically the structure characteristics of surrounding rock, large mining height are broken stope wall rock stress distribution, large mining height are broken small coal pillar stoping tunnel overburden fracture characteristics and large mining height are broken small pillar extraction roadway surrounding rock stability analysis; In addition, by using the method of numerical simulation of roadway driving along goaf of30222working face in small coal pillar are analyzed in numerical simulation to select the reasonable dimension of coal pillar30222face small. Finally, the comprehensive analysis of large mining height are broken small coal pillar stoping roadways integrated control mechanism, to determine the30222island coal face of extraction roadway support scheme. This article studied and analyzed the san yuan nan yao xiao chang coal mining height are broken30222island coal face along the empty small coal pillar design, as well as the large mining height are broken30222island coal face of small coal pillar extraction tunnel support scheme.The research results of this paper will provide certain theoretical basis and the reference value for the similar big mining height are broken island coal face under the condition of small coal pillar extraction roadway surrounding rock control technology. |
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