论文部分内容阅读
根据Drucker-Prager准则,考虑中间主应力对煤壁内塑性区宽度的影响,从理论上研究分析了塑性区的范围及受力情况,推导出塑性区宽度的计算公式及在塑性区内能够反映应力分布规律的表达式,并与经典的Mohr-Coulomb准则导出的公式计算结果进行对比,详细讨论了各因素对塑性区宽度的影响。结果表明,中间主应力对塑性区宽度具有重要的影响,并且表现出了中间主应力效应的区间性,而且计算结果说明将Drucker-Prager准则导出的公式应用于工程实践中比Mohr-Coulomb准则导出的公式安全性更大。
According to the Drucker-Prager criterion, considering the effect of intermediate principal stress on the width of plastic zone in coal wall, the range and force of plastic zone are theoretically analyzed, and the formula for calculating the width of plastic zone and the formula of plastic zone width The stress distribution law is compared with the formula derived from the classical Mohr-Coulomb criterion. The influence of each factor on the width of plastic zone is discussed in detail. The results show that the intermediate principal stress has an important influence on the width of the plastic zone and shows the interval property of the intermediate principal stress effect. Furthermore, the calculation results show that the formula derived from the Drucker-Prager criterion is applied to the engineering practice than that derived from the Mohr-Coulomb criterion The formula is more secure.