基础形式对深埋双孔钢波纹管涵承载特性的影响

Influence of Foundation Type on the Bearing Characteristics of Buried Double-hole Steel Corrugated Pipe Culvert

依托某高填方路基斜跨深切冲沟工程实例,针对不同基础形式的高填土双孔钢波纹管涵的承载特性,通过有限元数值模拟,选取基础圆心角及刚度进行正交对比,分析管涵的应力分布及变形规律。结果表明:双孔钢波纹管涵相互作用、彼此制约,延管涵竖向轴线两侧受力非对称,在靠近相邻管涵一侧应力及变形均小于另一侧。当基础刚度一定,随圆心角θ增大,基础包裹管涵的区域增大,约束作用增强,管涵变形随之减小,应力呈减小趋势且分布更为均匀,有利于管涵承载。当基础圆心角θ一定,刚度改变时,填土约束作用最小,管涵应力整体较大,变形最大,混凝土基础的约束作用最强,管涵变形最小,但易引起局部应力集中,约束作用居中的灰土基础,具有较好的变形协调作用,应力较小且集中现象不明显,管涵变形可控、可知,圆心角θ=180°的灰土基础是较为理想的基础选型。

Based on a high fill roadbed inclined span deep gully engineering, aiming at the bearing characteristics of high-fill double-hole steel corrugated pipe culverts with different foundation forms, through finite element numerical simulation, the central angle and stiffness of the foundation are selected for orthogonal comparison, and the stress distribution and deformation laws of the pipe culvert are analyzed. The results show that the double-hole steel corrugated pipe culvert interacts and restricts each other, the force on both sides of the vertical axis of the extension pipe culvert is asymmetrical, and the stress and deformation on one side close to the adjacent pipe culvert are smaller than the other side. When the foundation stiffness is constant, with the increase of the central angle, the area of the foundation wrapping the pipe culvert will increase, the restraint effect will increase, the deformation of the pipe culvert will decrease, and the stress will decrease and the distribution will be more uniform, which is beneficial to the bearing of the pipe culvert. When the foundation center angle is constant and the rigidity changes, the restraint effect of the filling is the smallest, the overall stress of the pipe culvert is larger,the deformation is the largest, the restraint effect of the concrete foundation is the strongest, and the deformation of the pipe culvert is the smallest, but it is easy to cause local stress concentration. The lime-soil foundation with the restraining effect in the middle has good deformation coordination, the stress is small and the concentration is not obvious, the deformation of the pipe culvert is controllable, and it can be seen that the lime-soil foundation with the central angle θ=180° is an ideal foundation selection.