Fracture fractal dimension index-based mining overburden rock quality evaluation method
A quality evaluation and fractal dimension technology, applied in earthwork drilling, wellbore/well components, etc., can solve problems such as affecting safe mining, failure to consider rock mass fissures, inaccurate rock mass quality evaluation, etc., to ensure safety, Realize the effect of dynamic evaluation
Inactive Publication Date: 2016-07-20
QINGDAO TECHNOLOGICAL UNIVERSITY
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[0005] The technical problem solved by the present invention is to overcome the problem that the traditional rock mass quality evaluation method does not consider the cracks in the rock mass, resulting in inaccurate evaluation of rock mass quality and affecting safe mining, etc., and provides a method for evaluating rock mass by fractal dimension Quality method, and use this index to evaluate the quality of the mining overlying rock, so as to guide the support work of the mine layer and ensure the mining safety of the mine
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[0036] The invention is based on the on-site measurement of the dynamic evolution of the cracks in the mining overlying rock, and uses the crack fractal dimension index constructed in this area to evaluate the quality of the mining overlying rock, thereby further ensuring the safety of mine mining. The present invention will be further described below in combination with specific embodiments. In this embodiment, coal mining is taken as an example for description.
[0037] refer to figure 1 , a method for evaluating the quality of mined overlying rock based on the fracture fractal dimension index proposed in this embodiment includes the following steps:
[0038] Step S1, constructing the fracture fractal dimension index;
[0039] Step S2. Evaluate the quality of the mined overlying rock according to the above fracture fractal dimension index.
[0040] For step S1 to construct the crack fractal dimension index, it specifically includes the following steps:
[0041] Step S11, ...
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The invention provides a fracture fractal dimension index-based mining overburden rock quality evaluation method. The method comprises the following steps: building a fracture fractal dimension index, namely drilling rock mass at the upper part of a goaf for a core, converting wall occurrence information of the core into a fractal dimension of a fracture network, obtaining a quality index of corresponding rock mass, obtaining a fitted straight line equation, and obtaining the fracture fractal dimension index of evaluating the rock mass quality by the fractal dimension according to the grading standard of the RQD; and (2) evaluating the mining overburden rock quality according to the index, namely carrying out real-time collection on hole wall video information of measurement holes of the mining overburden rock by a drilling imager, converting the hole wall video information into the fractal dimensions of the measurement holes, thus obtaining the mining overburden rock quality at different positions and different moments by matching with the index. According to the method, the targets of qualitatively and quantitatively expressing the rock fracture distribution rule by the fractal dimensions and dynamically evaluating the mining overburden rock quality are achieved, so that the supporting work of different positions of a coal seam is guided; and the safety of mining engineering is ensured.
Description
technical field [0001] The invention belongs to the technical field of mine safety, and in particular relates to a method for evaluating the quality of mined overburden rock by using the fractal dimension of the cracks in the region based on the measurement of the dynamic evolution of fissures in overburden strata mined on site. Background technique [0002] Fractured rock mass is one of the most common and important media in underground engineering, which directly affects the stability and safety of caverns, and is the key factor considered first when studying the integrity of rock mass. [0003] At present, the evaluation and judgment of rock mass quality mostly rely on normative documents such as engineering geological survey specifications. The cracks in the rock mass are also constantly evolving, and the evolution degree of the cracks directly affects the stability of the rock mass. At present, the failure and instability of many mining projects are related to the expan...
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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 于广明米文瑞袁长丰宋传旺
Owner QINGDAO TECHNOLOGICAL UNIVERSITY