上埋式公路涵洞地基及基础的设计

为了探讨上埋式公路涵洞的地基及基础的工作机理、提高设计水平，分析了目前地基承栽力的确定与地基及基础的设计方法；通过首次给出的涵洞、填土体、地基及基础共同工作机理模型，分析了公路涵洞的受力及其与土体的共同工作性状。结果表明：公路涵洞工程的地基及基础设计不能套用基底压力小于地基承栽力的原有原则；涵洞与地基刚度越大，涵顶上作用的土压力就越大。建议涵洞上部土压力按顾安全公式计算；地基承栽力确定原则为涵洞基础下与涵侧土堤下地基承载力相等。

Design of Soil-foundation System of Culvert under High Embankment

In order to analyze special mechanics of groundsill and foundation of culverts under high embankment and to increase design technique, the current methods for determining foundation bearing capacity are analyzed. The model of working mechanics of culvert with groundsill and foundation is proposed, Based on the model, the behavior of culvert and soil is analyzed. The resuits show that the principle that pressure under foundation must be lower than foundation bearing capacity is not suitable for culvert projects. The vertical earth pressure on the culvert increases with the growth of the rigid of culvert and the foundation, it can be calculated with GU Anquan formula. Foundation bearing capacity of foundation under the culvert should be equal to capacity of foundation beside the culvert. 2 figs, 8 refs.