摘要
采用Mohr-Coulomb屈服准则,利用所建立的力学模型推导了考虑渗透力作用下球形洞室弹塑性解析表达式。根据解析式,绘制了不同渗流力作用下考虑渗透力和不考虑时塑性区应力场变化图、塑性区半径与洞壁支护力关系曲线图以及圆形洞室与球形洞室塑性区半径对比曲线图,研究结果表明:球形洞室塑性区应力随其半径的增大而逐渐增大,随着渗透力的增加,径向和环向应力的增加幅度逐渐变大;渗流效应对球形洞室塑性区半径的影响十分显著;在支护力较小时,从洞室围岩稳定性角度出发,采用球形洞室比圆形洞室更有利,反之采用圆形洞室比球形洞室更有利。研究结果对隧洞支护设计具有重要的理论指导意义。
Taking into account of seepage force,the elastoplastic solution of the spherical opening is obtained by using Mohr-Coulomb criterion and established analytical formula. According to the analytical formula,the stress field change diagram of plastic zone under different seepage force is drawn,the curve of relationship between plastic zone radius and the wall supporting force,and the contrast curve of plastic zone radius between the circular and the spherical cavern are drawn. The results show that the stress in plastic zone increases gradually with the increase of radius,and the amplitude of radial and circumferential stress increases with the increase of seepage force. The effect of seepage effect on the radius of plastic zone of rock masses is significant;when the supporting force is small,the spherical openings are safer than the circular ones from view of stability of rock masses of openings,adversely,circular openings are safer than spherical ones. The research results can provide great theory significant for the support design of tunnels.
作者
黄华
谷新保
蒋智明
HUANG Hua;GU Xinbao;JIANG Zhiming(School of Civil Engineering,Sichuan University of Science&Engineering,Zigong 643000,China)
出处
《四川理工学院学报（自然科学版）》
CAS
2019年第1期76-81,共6页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
四川省教育厅重点项目(17ZA0270)
四川省桥梁无损检测和工程计算高校重点实验室项目(2016QYJ02)
大学生创新创业计划项目(201710622092
201710622091)
