扬子乙烯工程桩基测试实况

Measuring and Testing on Foundation Columns in Yangzi Ethylene Engineering

在扬子乙烯工程桩基测试中,通过对动、静试验的对比,得到动测分析与静载试验十分接近的结果。但由于某些前提不正确,动测推算的结果仍存在一定的随机性。工程还采用了专门研制的大型压力传感器测试桩身内力,展示了不同荷载作用下端承力和桩侧摩擦力的发展趋势。时效试验得出了不同深度桩内力随时间变化的规律及与孔隙水压力、桩尖应力、承载力之间的关系。文章还根据试验数据,对传统的群桩效率公式作了切合实际的修正。

Through contrasting of dynamlic and static tests on foundation columns in Yangzi ethylene engineering, the gained dynamic analysis result is quite close to that of static test. However, there is a certain randomness with the dynamic analysis because some preconditions are not correct. Large specially developed pressure sensors are used to measure inner force of the columns. It shows the variant tedency of end bearing force and sideway fraction force of the columns under different loads. Aging test shows the regularity in which the column's inner forces of different depthes vary with time and the relationship of pore space pressure, column end stress and bearing force. It also properly revises the traditional efficient formula of group columns based on the test data.