自平衡试桩荷载–沉降曲线的解析算法-岩石力学与工程学报.PDF

第 25 卷 增 1 岩石力学与工程学报 Vol.25 Supp.1 2006 年 2 月 Chinese Journal of Rock Mechanics and Engineering Feb.，2006 自平衡试桩荷载–沉降曲线的解析算法 1，2 2 2 蒋益平 ，杨 敏 ，熊巨华 (1. 上海市城市建设设计研究院，上海 200011 ；2. 同济大学 地下建筑与工程系，上海 200092) 摘要：自平衡试桩是一种新的静荷载试桩方法。采用荷载传递法，根据桩侧土的塑性发展规律，推导得到自平衡 试桩荷载–曲线的完整解析解，其中桩侧土采用双折线模型、桩端土采用三折线模型。讨论传递函数模型参数的 确定方法。通过工程实例验证了解析解的合理性，反映出解析解能较好地描述自平衡试桩的荷载–沉降特性。 关键词：土力学；自平衡试桩；荷载传递；解析解 中图分类号：TU 43 文献标识码：A 文章编号：1000 –6915(2006)增 1 –3258 –07 ANALYTICAL EQUATION OF LOADING-SETTLEMENT CURVE UNDER O-CELL PILE TESTING METHOD 1，2 2 2 JIANG Yiping ，YANG Min ，XIONG Juhua (1. Shanghai Urban Construction Design and Research Institute ，Shanghai 200011 ，China； 2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092 ，China) Abstract ：The O-cell pile testing(OPT) method is a new axial static load test of pile. Based on plastic law of pile lateral soil，a set of analytical equations of the loading-settlement curve for OPT are established by using load transfer method ，in which pile lateral soil is simulated with bilinear load-transfer model and pile toe soil with trilinear load-transfer model. The method to get the parameter of the load-transfer function is discussed. The analytical equation verified by two history engineering cases can be used to describe the loading-settlement characteristic of OPT effectively. Key words ：soil mechanics；O-cell pile testing method ；load transfer ；analytical solution 1 引 言 [1，2]