【作者】 李俊青；

【导师】 毛坚强；

【作者基本信息】 西南交通大学 ， 岩土工程， 2008， 硕士

【摘要】 目前,对桩的水平受力特性的计算研究已有较多的研究成果,而对填土中受水平荷载桩的研究却相对较少。本文结合四川普光天然气净化厂强夯填土桩基工程,进行了以下工作:(1)介绍了目前对受水平荷载作用下单桩受力特性的一些研究成果,总结了水平承载桩的计算方法。(2)依据普光天然气厂水平试桩的试验结果,分析了强夯填土中受水平荷载的单桩的受力变形特性。(3)运用ANSYS有限元软件,计算分析了桩的受力变形特性及填土固结的影响。(4)应用常数法、m法、c法等计算方法,计算分析了水平荷载作用下的桩的受力性质,并与有限元法和实测结果对比,研究其适用范围。通过研究,本论文得出以下结论:(1)横向受荷桩的承载力主要由靠近地表的桩和桩周土体提供,超出此范围的桩及桩周土对水平承载力的影响不大。(2)桩周土体的固结程度对桩身内力与位移影响较大,且不考虑这一影响时,计算结果是偏于不安全的。(3)在荷载较小的情况下,常数法、m法、c法等线弹性地基反力法计算结果与实测结果比较相符。虽然常数法计算结果与实测值相符合,但由于其假设条件与实际情况相差很大,而m法计算方法简单于c法,因而推荐使用m法。而当水平荷载较大时,这些计算方法与实际情况误差很大,无法应用于实际工程中。更多还原

【Abstract】 So far, more achievements have been gained on the research of characteristics of pile under horizontal load. However, little of them are concern with pile in fill-up ground. In this paper, following research works have been done:(1) Some calculation methods and research results of mechanical characteristics of single pile under horizontal load were summarized.(2) Based on the results of in situ pile test under horizontal load in Puguang Natural Gas Refining Plant, the bearing and deforming behaviors of the single pile under horizontal load in dynamic compaction fill-up ground were analyzed.(3) The behaviors of the single pile under horizontal load and the influences of consolidation on the behaviors of the pile were analyzed on the calculating results of finite element method software of ANSYS.(4) According to the calculating results, the applicable extent of constant method, m-method and c-method were suggested.Following conclusions have been achieved with the research:(1) Bearing capacity of the single pile under horizontal load depends on certain extent below the ground surface of pile and the soil around pile.(2) The consolidation degree of dynamic compaction fill-up ground has prominent effects on the internal forces and deformation of the pile and the results ignoring the effects trend to unsafety.(3) The constant method, m-method and c-method are applicable only for smaller horizontal load and m-method is recommended for calculation due to its simplicity.更多还原