Abstract
The relationship between support and surrounding rock is of great significance to the control of sur-rounding rock in mining process.In view of the fact that most of the existing numerical simulation meth-ods construct virtual elements and stress servo control to approximately replace the hydraulic support problem,this paper establishes a new numerical model of hydraulic support with the same working char-acteristics as the actual hydraulic support by integrating numerical simulation software Rhino,Griddle and FLAC3D,which can realize the simulation of different working conditions.Based on this model,the influence mechanism of the supporting strength of hydraulic support on surrounding rock stress reg-ulation and coal stability in front of the top coal caving face in extra thick coal seam were researched.Firstly,under different support intensity,the abutment pressure of the bearing coal and the coal in front of it presents the"three-stage"evolution characteristics.The influence range of support intensity is 15％-30％.Secondly,1.5 MPa is the upper limit of impact that the support strength can have on the front coal failure area.Thirdly,within a displacement range of 2.76 m from the coal wall,a support strength of 1.5 MPa provides optimal control of the horizontal displacement of the coal.
基金项目
Distinguished Youth Funds of National Natural Science Foundation of China(51925402)
国家自然科学基金(51904203)
国家自然科学基金(52174125)
中国博士后科学基金(2021M702049)
Tencent Foundation or XPLORER PRIZE,Shanxi Science and Technology Major Project Funds(20201102004)
Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering(2021SX-TD001)
Open Fund Research Project Supported by State Key Laboratory of Strata Intelligent Control and Green Mining Cofounded by Shandon(SICGM202209)
维普
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