非对称应力作用下直墙马蹄形隧道塑性区研究

摘要

基于已有的圆形洞口围岩塑性区解答,通过旋转极坐标轴角度,由复变函数保角映射方法,得到了非对称应力作用下直墙马蹄形隧道围岩塑性区半径解析公式,并结合算例进行了分析,通过塑性区半径分布图验证了该方法的有效性.%Based on the circular tunnel plastic zone solutions and by means of rotating the maximum principal stress direction,an analytical formula for the radius of the plastic zone of surrounding rock around a straight wall horseshoe tunnel under unsymmetrical stress was derived by the complex variable function theory.And a numerical example is given to illustrate the effectiveness of the proposed method.