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苏通大桥主塔墩群桩基础是世界上规模最大的群桩基础,由131根长117 m的超长钻孔灌注桩组成。在这样的工程环境下工作的传感器不仅要承受巨大的压力作用,还受一些施工因素影响,极易损坏。为了提高传感器埋设的成活率,经过多次现场试验,提出了包括混凝土应变计、表面应变计、静力水准和水深传感器等多种传感器的保护技术。传感器保护技术的实施,使得传感器成活率得到保证,整个监测系统的平均成活率超过96%。并利用实测数据分析了超长桩的荷载传递和不均匀沉降规律,结果表明,超长钻孔灌注桩的荷载传递规律有别于一般的桩基础;大型群桩基础的不均匀沉降主要表现在横桥向,纵桥向的不均匀沉降可以忽略。
The pylon foundation of Sutong Bridge pylon group is the largest group pile foundation in the world and consists of 131 long bored piles of 117 m in length. Sensors working in this kind of engineering environment not only have to withstand tremendous pressure but also can be easily damaged by some constructional factors. In order to improve the survival rate of buried sensor, after many on-site tests, a variety of sensors, including concrete strain gauges, surface strain gauges, static level sensors and water depth sensors, have been proposed. The implementation of sensor protection technology, making the sensor survival rate is guaranteed, the monitoring system, the average survival rate of more than 96%. The results show that the load transfer rule of super-long bored piles is different from that of ordinary piles. The non-uniform settlement of large-sized group pile foundations is mainly reflected in the following aspects Cross-bridge, vertical bridge to the uneven settlement can be ignored.