【作者】 李维；

【导师】 洪宝宁；

【作者基本信息】 河海大学 ， 岩土工程， 2007， 硕士

【摘要】 瞬态瑞雷波技术是近年来兴起的一种分辨率高、应用范围广、受场地影响小、检测设备简单、检测速度快的无损检测技术。它利用瑞雷波在分层介质中传播时，频散特性和传播速度与介质物理力学性质的密切相关性，实现对物体内部进行测试的目的。本文通过现场瑞雷波测试，结合室内共振柱试验，以及原位孔隙水压力监测，对利用瑞雷波技术测试软基固结度进行了系统的研究。论文的主要内容如下：1．针对软基的固结度问题，提出了不同预压荷载条件下软基固结度的计算方法；基于排水固结原理，分析了超载量与软基完成固结度的关系；给出了软基预压荷载的卸载控制标准。2．通过对瑞雷波传播特征、数据采集、速度求取等方面和利用瞬态瑞雷波技术测试软基固结度的具体特点的研究，提出了一种现场测试方法和相应的测试理论。3．根据室内共振柱试验结果建立了剪切波速与土体固结度的相关关系式，并将试验成果应用于现场求取软基固结度的测试。通过与原位孔隙水压力监测固结度比较，论证了利用瞬态瑞雷波技术快速检测软基固结度的可行性。为了便于实际应用，用FORTRAN语言编写了相关物理参数的计算程序。4．利用瞬态瑞雷波测试得到的固结度和原位孔隙水压力监测的成果，对某高等级公路试验段软基的处理效果进行综合评价，就提前卸载可能产生的质量隐患进行了分析，并提出了相应的处理建议。更多还原

【Abstract】 The transient vibration Rayleigh wave technique is a new technique developed recently, which has a lot of advantages such as high resolution, widely applicable, small affected by the site, simple-equipment, efficient, non-destructive and so on. This test technique uses the frequency dispersion characteristics of Rayleigh wave which propagate in layer media and the closed relations between velocity and physical mechanical properties. Through field Rayleigh wave test, laboratory resonant column triaxial test and in situ neutral pressure monitoring, studying the application of Rayleigh wave which measurement the degree of consolidation of foundation soil. The main contents of the paper are as follows:1. Put soft foundation consolidation calculation methods which used in different precompression loading for the consolidation of soft foundation; based on the principle of drainage consolidation, analysis the relations of superload and consolidation of soft foundation; put the unloading control standards of soft foundation consolidation.2. Through studying propagation features, data acquisition, speed strike, and the specific features of transient Rayleigh wave test soft foundation consolidation; then a test method and the corresponding testing theory are put.3. The relationship between the shear wave velocity and the degree of consolidation can be established by laboratory resonant column triaxial test achievement, whose results were applied to the field test to strike the degree of consolidation of soft foundation. Contrasting the results of Rayleigh wave test and in situ neutral pressure monitoring, verificating the feasibility of testing the degree of consolidation efficiently by transient Rayleigh wave. Procedures are programmed by the FORTRAN language to calculating the physical parameters of the test efficiently.4. The effect of soft foundation evaluated though the degree of consolidation by Rayleigh wave test and the results of in situ monitoring, analysis the hidden qualitiy problems with advance unloading and propose appropriate recommendations.更多还原