顺层桥基岸坡在错落体作用下的稳定性分析

Stability Analysis of Bedding Slope of Bridge Foundation under the Action of Faulted Rock Mass

受地质构造影响和长大贯通节理切割,郑万高速铁路大宁河大桥万州端桥基处于潜在错落体的顺层岸坡上。岸坡的稳定性除了受控于顺层外,潜在错落体对岸坡稳定性的影响也不容忽视。本文在对桥址区区域地质和上下游岸坡现状调查分析的基础上,进一步对岸坡的稳定性进行计算分析。结果表明,顺层和错落体的安全储备均不足,其中地震和库水涨落是影响岸坡稳定性的主要因素,只有对顺层和错落体均进行加固处理,才能保证桥基岸坡的稳定和桥梁工程的安全。

Affected by the geological structure and long penetrative joint, the bridge foundation on the Wanzhou end of Daning River Major Bridge of the Zhengzhou-Wanzhou railway is located on the bedding slope with faulted rock mass. The slope stability is not only controlled by the bedding rock, but also by the influence of the potential faulted rock mass. Based on the investigation and analysis of regional geology condition and bank slope both upstream and downstream on the bridge site, the bank stability is further calculated and analyzed. The results show that the bedding slope and the faulted rock mass are not safe, and earthquake and water level fluctuating are the main factors to affect bank stability. In order to ensure the stability of bridge foundation and the security of the bridge engineering, it might reinforce and control both bedding slope and faulted rock mass.