Determination of the Loose Circle Thickness of Roadway Surrounding Rock and Supporting Test in Jinchuan No.3 Mining Area
The loose circle thickness in the roadway is an important basis for determining reasonable support parameters.Aiming at the difficulty of testing the loose circle of roadway roof,the 1330 m sublevel roadway in Jinchuan No.3 mining area was taken as the research object.Firstly,the ultrasonic method was used to test the loose circle of roadway side surrounding rock.Secondly,according to the test results,the parameters of uniaxial compressive strength σc,H-B constant mi,geological strength index GSI and rock mass disturbance parameter D in Hoek-Brown strength criterion were inverted by golden section method.Then,combined with the measured ground stress in No.3 mining area,the Hoek-Brown strength criterion and parameter inversion results were used to calculate the loose circle thickness of roadway roof surrounding rock.Finally,the loose circle thickness of different types of surrounding rocks in the 1330 m sublevel of the No.3 mining area was classified,and different support parameters were proposed according to the classification results.The research results provide a new method and technical support for the determination of the loose circle of roadway surrounding rock.
Roadway supportLoose circle of surrounding rockUltrasonic methodGolden section methodOrthogonal test
万方数据
维普
