预应力锚索在单桩竖向静载试验中的应用

Application of Pre-stressed Anchor Cable in Vertical Static Loading Test of Single Pile

摘要:

在狭窄场地上进行大吨位单桩竖向静载试验时，需要解决的问题是在试验设备受场地限制无法增加的情况下如何提供足够大的反力荷载。根据此次试验场地地层中基岩埋藏丰富且深度较浅的情况，通过采用预应力锚索，进行加载反力装置设计，最终采用十字形加载反力装置，有效地解决了反力荷载不足的问题，从而为类似的试验提供了一种思路和选择。同时，通过对试验中出现的一些问题诸如锚固力、自由段变形等进行深入地分析和研究，提出了有关改进和完善反力装置现方案的建议。

Abstract:

It is necessary to deal with the space limit to provide enough reaction load for large tonnage vertical static loading test on narrow sites. According to the situation of large amount of bedrock in shallow bury in testing site， pre-stressed anchor cable was applied to the design of counterforce device， and reaction load was effectively solved by crossed counterforce device at last. The paper discussed the problems in the test， such as deformation of anchoring and anchor free sections with the improving suggestion.