桥坡顺接工程中高边坡稳定性的三维数值模拟分析

    THREE DIMENSIONAL NUMERICAL SIMULATION AND ANALYSIS ON THE STABILITY OF THE HIGH SLOPE IN BRIDGE-SLOPE ENGINEERING

    • 摘要: 公路、铁路等工程在穿过高边坡或山谷时多采用桥坡顺接方式通过,这类边坡在开挖卸荷、降雨及桥面荷载等因素作用下极易产生灾变且影响巨大。针对桥坡顺接工程高边坡稳定性问题,依托云(浮)-罗(定)高速公路某高边坡,开展其稳定性三维有限元数值模拟,分别探讨其开挖前、开挖后支护前、支护后运营等3个不同阶段边坡稳定性及受力情况,研究高边坡在开挖、支护及桥面荷载等作用下的力学响应及其稳定性,以及边坡变形对桥梁安全性和行车舒适性的影响。计算结果表明:开挖后坡体稳定性降低,原定支护方案在提高边坡稳定性方面作用有限,并提出改进建议; 整个坡体的稳定性主要受开挖卸荷及工程支护控制,而受桥面荷载影响较小,仅对其附近的小范围坡体影响较大。研究可为桥坡顺接高边坡工程的设计与稳定性评价提供参考。

       

      Abstract: The combination of bridge and slope is usually used to pass through high slopes and valleys in the construction of transportation infrastructure projects, such as highway and railway engineering. And on this occasion, as the factors, such as excavation unloading, rainfall and bridge deck loads, can easily give rise to the destruction of the slope, it cannot be too necessary to pay close attention to the health condition of the slope. In this paper, aiming at high slope-bridge combination engineering under the action of excavation, supporting and bridge deck loads, we chose one typical high slope in the Yunfu-Luoding expressway project, and made a series of 3D finite element numerical simulation by Midas. By studying and analyzing the slope stability and stress distribution in the three stages of initial condition, before supporting, and operation stage, we analyzed the mechanical behaviours and stability of the high slope, and the influence to the bridge made by the slope, as well. The simulation results show that, as the original supporting scheme cannot make an effect on ensuring the slope safety, the stability of high slope decreases remarkably after the excavation, and we have also put forward an improved supporting scheme for the project. And, while the influence to the slope made by the bridge deck loads can be obvious within a limit range, it's insignificant to the overall level. And the change of bridge grade caused by the deformation of the high slope won't make a obvious difference to the driving comfort and safety of the bridge. The study in this paper can guide the construction and maintenance of this slope, and provide reference and ideas to the stability evaluation of the bridge-slope combined engineering in future.

       

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