A Numerical Simulation and Determination Method of Pressure Relief Parameters in Deep High Stress Roadway Drilling

Abstract

The invention discloses a numerical simulation determination method of a deep high-stress roadway drilling pressure relief parameter. Before simulation is carried out, a test roadway surrounding rock sample is firstly subjected to a loading and unloading test in a laboratory, an attenuation relationship between a rock sample strength parameter and a damage variable is obtained by fitting and is embedded into a FLAC<3D> (Fast Lagrangian Analysis of Continua) built-in strain softening constitutive model, and an actual measurement mine pressure expression law of a test roadway is taken as a known characteristic value to carry out inversion on the numerical calculation model parameter of a rock mass. A deep roadway drilling pressure relief numerical calculation model is established to simulate and analyze the influence law of a pressure relief drilling orientation, pressure relief opportunity and drilling parameters (diameter, length and inter-row spacing) on the stability of roadway surrounding rock, and a determination method of each factor which affects a pressure relief effect is put forward, and a drilling pressure relief technology system is perfected. The numerical simulation determination method considers the mutual action relationship of a pressure relief degree and the stability of the surrounding rock while pressure relief drilling parameters are determined, and the designed pressure relief drilling can perform a maximum pressure relief effect on a premise that the stability of the surrounding rock is guaranteed. The method is simple and exhibits high application value.

Description

technical field [0001] The present invention relates to the field of analysis of numerical simulation of surrounding rock stress transfer and surrounding rock deformation control in deep roadways, specifically, a numerical simulation of stress transfer and surrounding rock deformation control in deep roadways considering the impact of attenuation of strength parameters after the peak of surrounding rocks. Analytical method for hole pressure relief parameters. Background technique [0002] In recent years, the increase in the demand for coal resources and mining intensity in my country has led to the depletion of shallow coal resources, and many mining areas have successively entered the deep mining stage. After entering deep mining, the organizational structure, basic behavior characteristics and engineering response of coal and rock mass have undergone fundamental changes. After the roadway is excavated, the surrounding rock tends to show the mechanical characteristics of s...

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Problems solved by technology

[0004] 1) When numerical simulation is used to determine the pressure relief parameters of boreholes, the law of strength attenuation of surrounding rock in deep roadways is insufficiently understood. There is a large deviation from the actual situation, and the lack of inversion and verification process of laboratory tests and field engineering rock mass parameters leads to a certain blindness in the selection of rock mass parameters, which affects the output of calculation results;

[0005] 2) When designing the pressure relief parameters of boreholes, only conventional parameters such as diameter and length are considered, and the interaction relationship between borehole diameter and row spacing is ignored, and for some other borehole parameters that affect the pressure relief effect (such as Timing, orientation, etc.) are not considered overall, resulting in the failure to form a complete technical system for the determination of drilling pressure relief parameters, which restricts the popularization and application of drilling pressure relief technology

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