粗大误差在船坞围堰安全施工监测中的运用与分析

船坞监测数据对船坞围堰的正常施工起着非常重要的作用，但是由于各种不正确的因素导致监测数据与实际情况不符，而这些异常测值不能通过直观的方法进行剔除，从而对船坞围堰的安全施工监控产生较大的影响，必须进行判断和处理。分别介绍了3σ（拉伊达）、Grubbs（格罗布斯）、Dixon（狄克逊）3种常用排除粗大误差的准则，并应用于具体的船坞围堰安全施工监测。结果表明，这些准则能快速、方便、有效地排除异常测值，为船坞围堰安全施工提供帮助。

Application of Gross Error in the Dock Cofferdam Construction Safety Monitoring

The monitoring data of dock cofferdam is very important in the construction of dock. However, some incorrect factors led to the monitoring data does not match the actual situation, while the abnormal value can not be intuitive removed, thus it has a great impact on dock cofferdam construction safety monitoring, So it must be judged and handled. This article introduced 3a, Grubbs and Dixon methods to handle the Gross Error, and applied them to the concrete dock cofferdam construction safety monitoring. The results showed that these methods which provide help to the dock cofferdam construction. They can quickly, easily and effectively handle the abnormal value in some degree.