打桩过程中考虑溜桩影响的土阻力研究

发布时间：2019-03-17 11:24

【摘要】：大直径超长桩的可打入性分析的准确性是打桩施工顺利进行的重要保障,打桩过程中土阻力预测是其中的关键一环。现有的预测方法都不考虑不同的打桩过程对打桩土阻力产生的影响,根据东海某发生溜桩的实际工程,对打桩中产生溜桩时的土阻力预测方法进行了研究。根据现场打桩全程高应变监测取得数据,采用CAPWAP分析了整个打桩过程中土阻力随桩基入泥深度的变化,试验数据显示,打桩过程中的溜桩对桩侧摩阻力的分布产生了明显的影响;根据其影响程度的不同可以划分为完全影响区,部分影响区和不影响区3个部分,同时给出了不同区域中土阻力的计算方法。实例验证显示,这种方法预测的土阻力的精度明显高于现有常用方法的预测精度。
[Abstract]:The accuracy of penetration analysis of large-diameter super-long pile is an important guarantee for the smooth construction of pile-driving. The prediction of soil resistance in pile-driving process is one of the key points in the process of pile-driving. The existing prediction methods do not consider the influence of different pile-driving processes on soil resistance of pile-driving. According to the actual project of pile-driving in the East China Sea, the prediction method of soil resistance when pile-driving occurs in East China Sea is studied. Based on the data obtained from the high strain monitoring in the whole pile driving process, the variation of soil resistance with the depth of the pile foundation in the whole pile driving process was analyzed by CAPWAP. The test data showed that the soil resistance changed with the depth of the pile. In the process of pile driving, the sliding pile has an obvious effect on the distribution of the side friction of the pile. According to the different degree of influence, it can be divided into three parts: complete influence zone, partial influence area and non-influence zone. At the same time, the calculation method of soil resistance in different regions is given. An example shows that the prediction accuracy of soil resistance by this method is obviously higher than that of the common methods.
【作者单位】：天津大学建工学院岩土所;中冶建工集团有限公司勘察设计研究院;中水北方勘测设计研究有限责任公司;海洋石油工程股份有限公司;
【基金】：国家重点基础研究发展计划(973计划)项目(2014CB046800) 国家科技重大专项项目(2011ZX05056-002-01) 上海交大国家重点实验室开放课题(1201)
【分类号】：TU753.3

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