论文部分内容阅读
锚碇作为悬索桥的主要承力结构物,锚碇基础的稳定性直接关系到桥梁的安全。沉井基础是深厚覆盖层地区常用的锚碇基础形式,通常根据深厚覆盖层的地质、水文条件,初步确定锚碇的基础形式,但锚碇基础的具体形状仍缺乏量化的对比分析。以泰州长江公路大桥南锚碇基础为背景,在相同的沉井基础体积下,拟定锚碇基础形式分别为矩形和圆形,采用有限元数值模拟方法,针对拟定的基础形式进行了对比计算分析,基于锚碇基础在施工期和运行期下的变形、基底反力、土体塑性区的分布规律以及基础的抗滑移、抗倾覆稳定安全系数值,分析评价了不同形状下锚碇沉井基础的承载性能,为深厚覆盖层地区锚碇基础优化布置提供了量化的参考依据。
Anchorage as the main bearing structure of the suspension bridge, anchorage 碇 the stability of the foundation is directly related to the safety of the bridge. The caisson foundation is commonly used as anchor foundation in deep overburden area. The basic form of anchorage is usually determined according to the geological and hydrological conditions of deep overburden. However, the specific shape of anchor foundation is still lack of quantitative comparative analysis. Based on the South Anchorage Foundation of Taizhou Yangtze River Highway Bridge, the basic forms of anchorage were rectangular and circular respectively under the same basic volume of open caisson. The finite element numerical simulation method was used to calculate and analyze the basic form of the anchorage. Based on the deformation, base reaction force and the distribution of soil plastic zone during the construction period and the operation period as well as the safety and stability values of anti-slip and anti-overturning foundation, the anchoring and sinking caisson under different shapes The bearing capacity of the foundation provides a quantitative reference for the optimal arrangement of anchor 碇 in deep overburden regions.