Division and determination method for deformation stage of surrounding rocks in tunnel of fully mechanized caving mining
A technology of surrounding rock deformation and determination method, applied in the direction of measuring devices, instruments, etc., can solve the problem of few contact research, and achieve the effect of roadway surrounding rock stability and safety production promotion.
Active Publication Date: 2019-01-15
NORTH CHINA INST OF SCI & TECH
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Problems solved by technology
However, there are few studies on the influence of the advance bearing pressure distribution of fully mechanized caving mining on the deformation of the roadway, and the relationship between the two
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[0042] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0043] In this embodiment, taking the main mining seam 7 (4) coal seam and the j7401 working face of a certain coal mine as an example, the roadway of the main coal mining seam j7401 working face is determined by using the method for dividing and determining the deformation stages of the surrounding rock of the fully mechanized caving mining roadway of the present invention The stage of surrounding rock deformation, and the accuracy of stage division is checked.
[0044] The division and determination method of the deformation stages of the surrounding rock of fully mechanized caving mining roadway, including the division of the deformation stage of the surrounding rock of...
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The invention provides a division and determination method for a deformation stage of surrounding rocks in a tunnel of a fully mechanized caving mining, and relates to the technical field of mine safety. The method comprises the following steps of: firstly, dividing the area, which is formed in front of the working face after mining, into a plastic zone and an elastic zone; and calculating the vertical stress of the plastic zone, thereby obtaining the peak position of the lead abutment pressure. Then, dividing the deformation stage of the surrounding rocks in tunnel into an elastic deformationzone and a plastic deformation zone, by taking the peak position of the lead abutment pressure as a boundary. Dividing the plastic zone into a failure zone and a limit equilibrium zone, by taking theintersection as a boundary, which is the intersection of the curve of lead abutment pressure and the stress line of the original rock. Finally, arranging an observation station on the working surfaceto observe the lead abutment pressure; and monitoring and organizing the date of the lead abutment pressure; thereby determining the deformation stage of the surrounding rocks in tunnel. According tothe division and the determination method for the deformation stage of surrounding rocks in the tunnel of the fully mechanized caving mining, the deformation stage of the tunnel can be accurately divided according to the lead abutment pressure; and the theoretical support is provided for the advanced support for the tunnel and the control of the deformation of surrounding rocks in the tunnel.
Description
technical field [0001] The invention relates to the technical field of prevention and control of mine pressure and rock burst, in particular to a method for dividing and determining deformation stages of surrounding rocks in fully mechanized caving mining roadways. Background technique [0002] With the continuous improvement of my country's coal mining technology and mining machinery and equipment, comprehensive mechanized top-coal caving mining in large mines has become very common, and my country's fully mechanized caving mining technology is also at the forefront in the world. It is of great significance to grasp the appearance of advanced bearing pressure and the deformation characteristics of roadway surrounding rock in fully mechanized caving mining, which is of great significance for the in-depth study of mine pressure appearance, roadway support and equipment selection in fully mechanized caving mining. [0003] At present, many constructive results have been obtain...
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CPCG01B21/32
Inventor 秦洪岩欧阳振华尹尚先刘金海朱权洁赵希栋彭瑞刘晓辉陈建强李康常博
Owner NORTH CHINA INST OF SCI & TECH