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Open Access Principle and method of sleeve fracturing method in testing in-situ stress

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In order to more accurately obtain the coal mine ground stress level and orientation,authors proposed a new method for testing ground stress.The type JHDC-1 stress testing instrument is adopted and can automatically store testing pressure with high frequency and generate the test pressure-time curve.Through the implementation of two pressurized fracturing on a test hole,it can get accurate oil pressure value and its corresponding fracturing equation.Authors adopted the elastic stress concentration theory of round hole,analyzed the conversion relationship between the oil pressure value and its fracturing pressure,and provided the basic principle of three hole crack method for testing ground stress.In addition,authors also gave a detailed description for field test methods and steps.The test method is applicable to various geological conditions and underground environment test,especially suitable for on-site coal mine ground stress test.
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Keywords: ground stress; sleeve fracturing method; test

Document Type: Research Article

Publication date: February 15, 2015

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    The Journal is a unique comprehensive academic periodical completely dedicated to the coal science and mining industry in the world. The Journal stands out as an excellent source of scientific information in coal industry with nearly 400 papers published in 12 issues per annum.

    The Journal is published monthly by China Coal Society.
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