【作者】 潘炳成；

【导师】 胡云进；

【作者基本信息】 浙江大学 ， 水力学及河流动力学， 2008， 硕士

【摘要】 本文就真空-堆载联合预压法在加速滩涂软土固结方面进行了研究,主要是应用有限元分析软件ABAQUS进行了参数敏感性的分析研究。首先就滩涂开发中碰到的如何加快软土固结沉降速率的问题,引入软基处理方法—真空-堆载联合预压法,分析了这个问题的研究背景和研究现状。整理了真空-堆载联合预压法的施工工艺流程,对这一施工工法作了全面的介绍。接着系统介绍了软土固结的有限元分析基础Biot固结理论,并介绍了适用于进行土体弹塑性分析的Mohr-Coulomb本构模型。在此基础上,通过有限元分析软件ABAQUS对实际工程进行有限元的建模分析。首先验证了弹塑性有限元分析在滩涂软土固结分析中的可靠性与合理性。然后针对真空-堆载联合预压工程中影响土体固结沉降效率的因素进行了参数敏感性的分析,分析了土体在经过真空-堆载联合预压处理的加固效果以及变形位移随参数变化的规律,结合施工对参数进行合理性分析,提出各种如何加快滩涂软土固结沉降速率以及尽量减少工程对周围环境的影响等的工程措施,对真空-堆载联合预压法在加速滩涂固结等方面的工程应用提供设计与施工上的参考和帮助。更多还原

【Abstract】 This paper mostly studied how to advance and accelerate the consolidation of soft clay in shoal using surcharge incorporating vacuum preloading method. Then the sensitivity of parameters in engineering were analyzed by use of a finite element software named ABAQUS.At first, when we explore the land resources in shoal, many problems are presented, such as how to advance and accelerate the consolidation of soft clay. Surcharge incorporating vacuum preloading method is a good method to reinforce soft foundation. This method has been used to improve the shoal soil. This matter is very significant and important. The construction technology of surcharge incorporating vacuum preloading was also studied. The basis of the finite element analysis, Biot’s Consolidation Theory, was presented in detail. In analysis, Mohr-Coulomb constitutive model was used.Secondly, on the basis of elasto-plastic model proposed in the paper, the consolidation analysis of soft clay in shoal was reliability and reasonable. Then the sensitivity of parameters in engineering were analyzed. According to the analysis, consolidation and lateral displacement were transformed in rule with the change of parameters. Linked with the construction technology, this paper proposed various methods to accelerate the settlement of consolidation and reduce the effect of surcharge to environment around. This could be useful and helpful to engineering design and construction.更多还原