【作者】 张珊菊；

【导师】 曹华先； 李彰明；

【作者基本信息】 广东工业大学 ， 岩土工程， 2004， 硕士

【摘要】 本文以平板载荷试验为主要测试手段，对地基土体的变形及沉降特性进行了较系统的研究，探讨了地基在均布荷载下的变形与沉降规律，完善了现有荷载试验测试技术中的一些不足。研究内容包括： 1、测试了天然地基、复合地基在不同压板形状及尺寸下承压板下及周围地基土体的沉降，并做了数据计算分析； 2、利用弹性理论方法和FORTRAN程序分析计算了三维地基土体在矩形均布荷载下任意位置点的应力及变形； 3、利用滑移线方法分析了均布荷载下土体的变形范围问题； 4、应用ANSYAS大型有限元分析软件，结合工程实例，模拟分析了三维弹塑性地基土体在方形均布荷载下的变形特性，并对地基沉降计算方法进行了工程验算。 5、将以上分析结果进行对比讨论，提出了有益于地基变形分析与提高载荷试验测试技术精度的合理建议。更多还原

【Abstract】 By using the method of plate load test, the deformation and settlement characteristics of foundation soils are systematically studied in this paper and the rules of deformation and settlement under homogeneously distributed load are discussed, which can complete the insufficiency of test technology in load test. The content includes followings:1. The settlement all round the plate which is different in shape and size are tested with crude foundation and composite foundation and the datum are calculated and analyzed;2. The stress and deformation in any spots of 3D foundation soils which is under rectangular homogeneously distributed load are calculated and analyzed by methods of elastic theory and FORTRAN program;3. The scope of foundation soils deformation under rectangular homogeneously distributed load is analyzed by the use of slide and move thread theory;4. By using the finite element analysis software of ANSYS, with engineering examples, the deformation characteristics of 3D elastic-plastic foundation soils under rectangular homogeneously distributed load are imitated and analyzed, at the same time, the method of settlement calculation of soils is checked.5. By contrasting and discussing the analysis results above, this paper put forwards proposals that are useful for foundation deformation analysis and improving the test precision of load test.更多还原