地应力弹性参数计算的应力区间分级方法研究

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Abstract Confining pressure test for trepanning core acquired from in-situ stress measurement is an important means to obtain rock elastic parameters in in-situ stress calculation. The testing results and data processing play an important role in precision of final in-situ stress value. At present，rock elastic parameters are usually calculated on the basis of stress and strain under highest pressure in testing，which could lead to major error owing to rock nonlinear characteristics and test conditions. Confining pressure tests including multiple specimens are implemented by means of confining pressure instrument. Testing results are reasonable which are modified through analysis of testing curve law and consider multiple error factors. Based on loading unloading deformation theory of rock and rock nonlinearity，a calculation method in which elastic parameters are divided by different stress intervals is put forward. In-situ stress calculation example of No.10 mine of Pingdingshan Tian?an coal mine Co.，Ltd. is used to verify this method. The results reveal that linear correlation of calculated stress value and depth is more significant，which will provide references to improvement of in-situ stress calculation accuracy.

Key words： rock mechanics in-situ stress measurement;confining pressure test;elastic modulus;stress interval classification

Received: 24 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/Isl/2728

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