高速公路桥基岸坡稳定性计算分析

桥基岸坡的稳定性分析是跨谷桥梁设计计算中最为关键的问题之一.过去常把桥基岸坡简化成平面问题来分析,事实上桥基岸坡空间效应显著,简化成平面问题过于牵强.采用三维数值方法,结合有关传统理论和经验公式,对桥基加载前后的整体稳定性系数、桥基的合理位置、单桩的极限受力进行了综合分析,并据此指出应加固的部位和提出相应的加固措施.同时也跳出了以单一稳定性系数作为评价桥基岸坡是否稳定的圈子,通过合理考虑桥梁基础位置与基础受力等因素,提出了一种综合评价桥基岸坡稳定性的新方法.该方法可以根据坡体形式、地质条件、桩型、桩间距、桩长、荷载大小和施工阶段进行应力、变形和整体稳定性分析,分析结果可以指导加固部位和加固措施的确定.

Computational analysis of stability of bridge foundation slope for expressway

There are many important problems to be calculated in designing a spanning bridge in mountainous area, one of which is how to calculate the stability of bridge foundation slope. It used to be degenerated into plane problem. In fact, steric effect of bridge foundation slope is obvious. Adopting three-dimensional numerical method, combining traditional theories and empirical formulas, this paper synthetically analyzed the stability of bridge foundation before and after loading; reasonable position of bridge foundation, and the limit stress of piles. Hereby, it indicated reinforced position, and offered corresponding measures. At the same time, this paper jumped a circle that evaluated the stability of slope by a single stability coefficient, offered a new approach, which thought about the reasonable position of bridge foundation and foundation stress, to appraise slope stability of bridge foundation. Aiming at different slopes, different geologic conditions, different types of piles, different lengths of pile, different loads, and different stages of construction, it can analyze stress, strain, and whole stability. The results of analysis can help to confirm the positions and measures of reinforcement.