| Gob-side entry retaining support technology is a graveness reform of supporting technology in coal mine, it is distinctly beneficial to increasing the extraction rate, reducing the roadway drayage rate,easing the intense relationship between mining and drivage and intension production. But gob-side entry will serve a long time and be infected twice by mining, the stability of its surrounding rock is hard to be controlled. Aiming at the characteristic of the big surrounding rock deformation and the variance of the mechanical characteristic, adopted synthetical research means including theoretic study,numerical simulation,mathematical analysis and engineering examples, analysised the stability of the bolt supporting and the supporting zone filled with high-water rapid hardening materials from the angle of system engineering by the theories of engineering structures stability theory, system stability theory, rock mechanics, elastic-plastic mechanics and computer technology, the following results were gotten in this paper:1. According to the surrounding rock moving regulation of gob-side entry retaining, its mechanical model was established, the principle and methods to control the stability of the surrounding rock is gotten.2. The stability model of bolting and filling body and the systemic stability model of this supporting structure were established.3. The calculation methods of stability were analyzed. Aimed at the high nonlinear limit state equation of supporting structure, the merits and details of Mente-carlo method were studied.4. Based on Mente-carlo method, software aimed to calculate its stability was developed which started a new approach of supporting structure stability calculation.5. The effect of supporting project designed based on the stability analysis was simulated by FLAC 2D, the stability judgment rules to the gob-side entry retaining supporting structure and the rationality and feasibility of the calculation system adopted in this paper were validated.
|
PDF Full Text Request