道路改扩建条件下石砌拱涵稳定性研究

Study on Stability of Stone Arch Culvert under the Condition of Road Reconstruction and Expansion

为研究张家口原公路改扩建为高速公路过程中,填土高度增加情况下石砌拱涵稳定性,采用有限差分数值计算方法,分析了不同填土高度情况下的拱涵-地基应力的变化规律。根据拱涵砌体的抗拉强度和抗压强度,建立砌体的等效粘聚力和内摩擦角,从而分析结构的安全系数。计算结果表明:结构体系的破坏主要源于地基的失稳,拱涵本身具有较高的安全系数。

In the course of old road at Zhangj carried out of the stability of stone arch culvert law of arch culvert-foundation stress under iakou being reconstructed into expressway, the study has been when filling height is increased, analysis is made of the change different filling height ussing finite difference method; and according to tensile and compressive strength of the masonry, its equivalent cohesive force and internal friction angle were established so as to analyze the structure＇s safety factor. The result shows that failure of the structural system is mainly caused by instable foundation while arch culvert itself has relatively high safety factor.