填海造地内湾护岸工程软土地基沉降分析及可靠度研究

发布时间：2018-04-11 08:33

本文选题：填海造地 + 内湾护岸　；参考：《中南大学》2014年硕士论文

【摘要】：摘要：随着社会的发展和人口的增长,我国沿海地区出现了越来越多的填海造地工程。内湾护岸工程是填海造地工程中一个非常重要的部分。由于填海造地内湾护岸工程中护岸结构的不对称性和软土地基的含水量高、渗透系数小、孔隙比大、压缩性大、抗剪强度低、灵敏度高等特性容易造成内湾护岸软土地基沉降过大和不均匀沉降等现象,严重影响护岸工程的安全性和稳定性。虽然,国内外研究软土地基沉降的方法和理论在不断完善和趋于成熟,但在填海造地内湾护岸工程软土地基沉降方面的研究成果并不是很多。因此,我们有必要对填海造地内湾护岸工程软土地基沉降作更多努力和研究,从而指导填海造地内湾护岸工程的设计和施工,提高内湾护岸工程的安全性和经济性。本文在前人们研究的基础上,结合某填海造内湾护岸工程实例,通过现场监测、理论分析、经验分析、数值模拟、可靠度分析等手段,主要进行了以下几个方面的工作： 1.制定了内湾护岸软土地基沉降的现场监测方案,并通过现场施工监测获取了大量的数据；分析了内湾护岸软土地基沉降机理,并结合现场监测数据分析了内湾护岸软土地基的沉降规律。 2.分别利用理论公式法、灰色理论法、双曲线法计算了内湾护岸工程软土地基的最终沉降；分别利用灰色理论法和双曲线法对内湾护岸工程软土地基沉降进行预测,并将预测结果与实测沉降进行对比分析；将灰色理论和双曲线结合产生灰色理论——双曲线组合的预测方法,利用灰色理论——双曲线组合预测方法预测内湾护岸工程软土地基沉降,并将预测结果与实测沉降进行比较分析。 3.借助有限元分析软件ANSYS,以Drucker-Prager模型为土的本构模型,建立了以Biot固结理论为基础的填海造地内湾护岸工程软基沉降计算模型。将该模型的计算结果与实测结果进行对比分析,验证了该模型的正确性。 4.利用已建立的填海造地内湾护岸工程软基沉降计算模型,定量分析了变形模量E、泊松比γ、内摩擦角φ、黏聚力c等参数对内湾护岸工程软土地基地表沉降的影响。按参数对软基沉降的影响程度从大到小排列为：泊松比,变形模量,黏聚力,内摩擦角。 5.取某填海造地内湾护岸工程项目中一典型断面ZH KO+300作为研究对象,对该断面能代表的内湾护岸工程进行可靠度分析,验证了护岸工程设计的合理性。并分析了护岸结构的坡高度比例对护岸工程沉降可靠度的影响。图60幅,表33个,参考文献117篇。
[Abstract]:Absrtact: with the development of society and the increase of population, more and more land reclamation projects appear in coastal areas of China.The inner bay revetment project is a very important part of the reclamation project.Because of the asymmetry of the revetment structure and the high water content of the soft soil foundation, the permeability coefficient is small, the porosity ratio is large, the compressibility is large, and the shear strength is low.It is easy to cause excessive and uneven settlement of soft soil foundation of inner bay bank revetment with high sensitivity, which seriously affects the safety and stability of bank revetment engineering.Although the research methods and theories of soft foundation settlement at home and abroad are constantly improving and maturing, the research results of soft soil foundation settlement in reclaimed inner bay bank protection project are not many.Therefore, it is necessary for us to make more efforts and research on the settlement of soft soil foundation in the reclamation inner bay revetment project, so as to guide the design and construction of the reclamation inner bay revetment project and improve the safety and economy of the inner bay revetment project.On the basis of the previous studies, combining with the example of a reclaimed inner bay revetment project, this paper mainly carried out the following work by means of on-site monitoring, theoretical analysis, empirical analysis, numerical simulation, reliability analysis and so on:1.The site monitoring scheme of soft soil foundation settlement of inner bay bank protection is established, and a large number of data are obtained through site construction monitoring, and the settlement mechanism of soft soil foundation in inner bay bank protection is analyzed.The settlement law of soft soil foundation of inner bay bank protection is analyzed based on field monitoring data.2.The final settlement of soft soil foundation of inner bay revetment engineering is calculated by theoretical formula method, grey theory method and hyperbolic method respectively, and the settlement of soft soil foundation of inner bay revetment project is predicted by using grey theory method and hyperbolic method respectively.The prediction results are compared with the measured settlement, and the grey theory and hyperbolic method are combined to produce the grey theory-hyperbolic combination.The grey theory and hyperbolic combined forecasting method are used to predict the settlement of soft soil foundation of the inner bay revetment project, and the results are compared with the measured settlement.3.With the help of finite element analysis software ANSYS and Drucker-Prager model as the constitutive model of soil, the settlement calculation model of soft foundation of reclaimed inner bay revetment is established based on Biot consolidation theory.The correctness of the model is verified by comparing the calculated results with the measured results.4.Based on the established calculation model of soft foundation settlement in reclaimed inner bay revetment project, the effects of deformation modulus E, Poisson's ratio 纬, internal friction angle 蠁 and cohesion C on the surface settlement of soft soil foundation of inner bay revetment engineering are quantitatively analyzed.The order of influence of parameters on soft foundation settlement is Poisson's ratio, modulus of deformation, cohesion and angle of internal friction.5.Taking ZH KO300, a typical section of a reclaimed inner bay revetment project, as the research object, the reliability of the inner bay revetment project which can be represented by this section is analyzed, and the rationality of the design of the revetment engineering is verified.The influence of slope height ratio of revetment structure on settlement reliability of revetment engineering is analyzed.There are 60 pictures, 33 tables and 117 references.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U655.54

【参考文献】