【作者】 黄林波；

【导师】 林鹏；

【作者基本信息】 汕头大学 ， 建筑与土木工程， 2011， 硕士

【摘要】 桩是岩土工程中最常见的基础形式。由于桩基系隐蔽工程,对桩基进行测试以确定其承载力和完整性一直是工程界十分关心的问题。检测桩的完整性一般用动荷载。低应变动力测桩法,其前提是建立在关于桩的振动频率理论或者应力波在桩的传播理论。低应变动力测桩法因其测量周期短、耗资小、应用简便,目前已被广泛应用于检测桩身完整性的检测。但由于其理论模型与实际情况的差异,工程实践中,因有关桩周土阻尼等系数的采用不仅仍需依赖于静荷载验桩,且与桩基类型、地质条件有关,而导致因测试人员经验不同得出的结论不同而影响到测试的有效性和可信度。本文系基于桩的振动理论,利用桩的振动频率与桩长的关系,通过对比直接确定桩基断裂的位置,计算过程中避免了桩周土阻尼等不确定因素对计算结果的影响。该方法简单易行,并且通过对一个工程实例的计算说明了其有效性。更多还原

【Abstract】 Pile is a prevailing mode of foundation in geotechnical engineering. The pile foundation is the concealed work, so to assess pile load capacity and to assess pile integrity has always been of concern. Dynamic load testing is used to assess pile integrity .The foundation of the theory of Low Strain Integrity Test is wave equation analysis and theory of pile vibration. Due to its simplicity, speed of execution and low cost, Low Strain Integrity Test has been widely applied in pile integrity test. However, due to the differences between theoretical model and actual practices, in engineering practice, the adoption of the soil damping coefficient around the pile not only still has to rely on the pile static loading test , but also on geological conditions and pile type. And the pile test results, due to testing personnel experience vary,affecting the validity and reliability of the test method.This paper is based on the vibration theory of pile,applying the rationale between frequency of vibration of pile and pile length, to determine the broken place of the pile. With noregard to the damping coefficient around the pile, the method is simple and its effectiveness has been confirmed by a practical engineering case.更多还原