边坡失稳对两岔河大桥影响数值分析

Numerical analysis on the influence of Liangchahe bridge with the considering of slope failure

以两岔河大桥工程为研究对象,采用ABAQUS软件,基于有限元—离散元耦合分析技术,建立能够精确反映地形地质条件的精细地质力学模型。在此基础上,建立数值分析模型,对上游侧陡崖边坡破坏模式以及上游侧陡崖失稳对邻近桥梁安全影响进行分析。研究结果表明:上游侧陡崖边坡的破坏模式是错落式破坏;上游侧陡崖边坡失稳后,破坏岩体将可能撞击桥梁墩台底部,从而导致桥梁垮塌;并根据破坏模式给出了相应的整治建议措施。

Regarding the project of Liangchahe Bridge as researching object.Base on the infinite element -ele-ment coupling analysis technology and ABAQUSS software,this paper established a geo -mechanical model which can accurately reflect the terrain and geological conditions.Then a three -dimensional numerical model was built.With the analysis model,this paper analyzed the failure mode of the steep slope in the tunnel exit,the upstream side of steep slope failure mode and the upstream side of a steep cliff instability influence on the safety of adjacent bridge.The results show that,the failure mode of the steep slope in the tunnel exit is progressive dumping damage;The failure mode of steep slope in the upstream side is strewn at random type damage;If the steep cliff slope in the upstream side instability,the failure rock would hit the bottom of the bridge pier,which would lead to the bridge collapse;Based on the failure mode,the corresponding improvement suggestions were put forward.