The Effect of Thermal Stress on Main Roof Breaking During First Weighting in Deep Mining
The calculation of interval distance of main roof first weighting is an important content of roof control design. In the past, the effect of thermal stress on main roof breaking during first weighting was not taken into account. But initial temperature of main roof is higher in deep mines, so variation of temperature in main roof is larger due to stope ventilation. Therefore thermal stress caused by temperature variation is higher. In order to determine the interval distance of main roof first weighting correctly, the effect of thermal stress should be fully considered under the condition of deep mining. In this paper, the coupled thermal-stress mathematical model of main roof is established based on characteristic of heat conduction and mechanical model of main roof in first weighting. Finite element method for coupled thermal-stress analysis of main roof is introduced. Coupled thermal-stress analysis of main roof is carried out by using ANSYS, and the interval distance of main roof first weighting is determined. Calculation results of an example indicate that the interval distance of main roof first weighting shorten about 20％ due to the effect of thermal stress.
main roof first breaking temperature field thermal stress coupled thermal-stress analysis
LI Tiezeng TAN Yunliang CHENG Guoqiang ZHANG Yuming
Key Laboratory of Mine Disaster Prevention and Control(Shandong University of Science and Technology Key Laboratory of Mine Disaster Prevention and Control(Shandong University of Science and Technology
国际会议
The 2007 International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)
河南焦作
英文
165-170
2007-04-17（万方平台首次上网日期，不代表论文的发表时间）