Calculation method of Hoek-Brown parameter m and s of solid rock influenced by different mining

Abstract

The invention belongs to the field of rock mass mechanics and engineering geology, and specifically discloses a calculation method of Hoek-Brown parameter m and s of solid rock influenced by different mining. The calculation method comprises following steps: drilling and coring of solid rock influenced by different mining are carried out, and standard samples are obtained via laboratory processing; uniaxial compressive strength of complete solid rock is obtained via uniaxial compression test; the samples influenced by different mining are provided with different confining pressure ranging from 5 to 40MPa via triaxial test, and are provided with axial pressure until the samples are destroyed, and load-displacement curve of the whole loading process is recorded; and at last, m values and s values under each set of conditions are calculated based on Hoek-Brown standard. According to the calculation method, the values of the Hoek-Brown parameter m and s of solid rock influenced by different mining are obtained via on-site coring and laboratory test.

Description

technical field [0001] The invention belongs to the fields of rock mass mechanics and engineering geology, and relates to a method for obtaining Hoek-Brown parameters m and s of hard rock mass affected by different mining operations. Background technique [0002] In my country, the coal seam belonging to the hard roof accounts for about one-third, and is distributed in more than 50% of the mining areas. The overhang of the working face with a hard roof is large, and the mining pressure is concentrated in time and intensity, which poses a great threat to the mining face, and may induce large structural mutations and instability, resulting in rock burst and other related disasters, which pose a threat to the safe mining of coal seams. Great threat. A large number of studies have shown that rock mass failure is a typical nonlinear failure. The Hoek-Brown criterion is used as an empirical strength criterion for rock mass. Because it can express the nonlinear failure characteris...

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Problems solved by technology

However, although the above method can obtain m and s, it has the following defects: ① the calculation results have large errors and low precision; ③ For the rock mass affected by multiple mining, human factors are considered more, and the calculation results are more inaccurate, sometimes even wrong

It is rare to obtain the Hoek-Brown parameters m and s of the hard rock affected by different mining operations, and it is affected by the geological conditions on the site, etc. The reliability of the obtained m and s needs to be further studied

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