For the widening project of low grade road in mountainous area,especially for the sections having high cutting on one side and high cliff or high-steep subgrade on the other side,a new widening scheme was proposed,i.e.a scheme of cantilever bearing beam supported by sleeper beams outside and tied by anchor rods inside.Taking the subgrade widening engineering as an example,its structure and bearing performance were introduced and studied.The result shows that:the new widening scheme has a reasonable structure,its strength,stiffness and stability meet the requirements in relevant specifications.And properly deepening the sleeper beams can obviously improve the stability of bearing capacity,it is recommended to adopt underground continuous wall or pile foundation for poor rock mass.The strength of the prestressed anchor inside and the reliable connection between the anchor rod and the bearing are particularly important.The prestressed anchor rods inside are the key to control the stability of bearing beam under the action of unbalanced load outside.The limiting device is the key to ensure the integrity stability,shock-proof,and prevent the bearing beam from slipping and the anchor rod being not affected by shearing force.
关键词
道路拓宽/枕梁/锚杆/悬臂承载梁/承载稳定性
Key words
road widening/sleeper beam/anchor rod/cantilever bearing beam/stability of bearing capacity
维普
万方数据