高填方涵洞地基承载力分析

Analysis of ground bearing capacity of high fill culverts

通过理论方法与数值模拟分析了地基土黏聚力和内摩擦角对涵洞地基承载力与沉降的影响,并根据高填方涵洞工程的受力特性,提出了综合考虑强度与沉降控制的承载力基本容许值确定方法.在《公路桥涵地基与基础设计规范》(JTG D63—2007)天然地基承载力公式的基础上,提出了考虑深、宽修正的复合地基承载力计算表达式.数值模拟和现场实测结果表明,综合考虑强度与变形要求来确定高填方涵洞的地基承载力,并进行深、宽修正的计算方法是合理的.

The influences of cohesion and fraction angle of ground soil on the bearing capacity and settlement of culverts were investigated through the theoretical analysis and numerical simulation. The expression of the basic value of bearing capacity is obtained by considering the strength and deformation of ground soil based on the stresses state of high fill culvert. Moreover, the formula of calculating the bearing capacity of composite ground under high fill culvert is also derived based on the calculation method of natural ground bearing capacity in current Chinese Code for Design of Ground base and Foundation of Higbway Bridges and Culverts, and the embedding and width effects of culvert foundation are taken into account. The results of numerical simulation and field tests show that the formula presented in this study for calculating the bearing capacity of high fill culvert ground is applicable.