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为了克服大型沉井设计和施工控制中存在的问题,对大型沉井侧壁摩阻力的计算模式进行了研究.根据马鞍山长江大桥南锚碇沉井侧壁土压力的现场监测数据,反推出不同下沉深度条件下沉井侧壁摩阻力的统计结果,并研究了大型沉井下沉期侧壁摩阻力的分布特征.分析结果显示:当沉井下沉深度小于某一特定深度H0时,井壁侧阻力基本上随着入土深度呈线性增长;而当沉井刃脚入土深度大于H0时,沉井侧壁摩阻力分布呈现上下小、中间大的分布,上部可近似为线性段,下部则近似为双曲线段;而且随着沉井入土深度的不断增加,沉井侧壁摩阻力峰值基本呈线性增长,且峰值发生的位置也逐渐下移.最后,建立了一种大型沉井侧壁摩阻力的修正计算模式.与现场实测数据的对比结果表明,所提出的修正计算模式是可行的.
In order to overcome the problems in the design and construction control of large-scale open caisson, the calculation model of the side-wall friction of large-scale caisson has been studied.According to the on-site monitoring data of the earth pressure on the side wall of the caisson in South Anchorage of the Ma'anshan Yangtze River Bridge, The results show that when the sinking depth is less than a certain depth H0, the distribution of the frictional resistance of the sidewall during the sinking period of the large sinkhole is studied. The resistance basically increases linearly with the depth of soil entry. When the entry depth of sunken shaft is greater than H0, the distribution of frictional resistance in the side wall of a caisson is small with a large middle distribution. The upper part can be approximated as a linear section and the lower part as approximately Hyperbolic segments.With the increase of depth of caisson intrusion, the peak friction resistance of caisson sidewall increases linearly and the peak position gradually decreases.Finally, a large-scale caisson sidewall frictional force The results of the comparison with the measured data show that the proposed correction calculation method is feasible.