论文部分内容阅读
基于复变函数方法,通过孔边及地表的应力边界条件,获得了自重应力和构造应力作用下浅埋圆形隧洞的应力和位移解析解,并通过ANSYS有限元软件对解析解进行了验证。引入可以反映地表水平应力大小的0q项,使得该解具有一般性,对地表水平应力分量为0或不为0的情形都可进行求解。分析了隧洞开挖后的应力场及位移场。结果表明,当地表存在水平方向应力时,隧洞的侧壁区域可能会出现切向拉应力,地表水平应力越大,出现的最大拉应力也越大;随着0q的增大,洞顶向上拱起,两侧受挤压向内变形的程度会加剧,地表会出现向上隆起现象,且在洞顶正上方程度为最大。
Based on the complex variable function method, stress and displacement analytical solutions of shallow buried circular tunnel under gravity stress and tectonic stress were obtained through the stress boundary conditions of hole edge and surface. The analytical solution was verified by ANSYS finite element software. The introduction of 0q, which can reflect the surface horizontal stress, makes the solution general, and can be solved for cases where the horizontal horizontal stress component is 0 or not. The stress field and displacement field after tunnel excavation are analyzed. The results show that when the horizontal stress exists on the local surface, the tangential tensile stress may appear in the sidewall area of the tunnel, and the greater the horizontal surface stress, the greater the maximum tensile stress. With the increase of 0q, From the beginning, both sides will be squeezed inward deformation will intensify, the surface will appear uplift phenomenon, and the maximum degree above the top of the cave.