重塑饱和粉质黏土时间变形特性的试验研究

发布时间：2018-04-19 12:17

本文选题：粉质黏土 + 一维固结试验　；参考：《浙江工业大学》2016年硕士论文

【摘要】：我国沿海地区广泛分布着大量的粉质黏土层,由于粉质黏土存在显著的时间变形特性,使建于其上的工程不仅在施工期间会产生较大的沉降,而且在工程竣工后的沉降问题也特别突出。因此,深入研究粉质黏土的时间变形特性,对沿海地区工程的工后沉降分析具有重要的实践指导意义。本文在综合国内外研究现状的基础上,对浙江沿海地区重塑饱和粉质黏土进行了室内一维固结试验、等压固结试验和三轴剪切蠕变试验,系统研究了重塑饱和粉质黏土的时间变形特性。本文主要研究内容如下:(1)对重塑饱和粉质黏土进行了一维固结试验,采用不同的加载分级方式,研究在侧限条件下,不同的加载分级方式对重塑饱和粉质黏土时间变形特性的影响。同时划分了一维固结试验中的主次固结过程,并根据次固结试验数据采用对数和双曲线蠕变模型进行拟合,发现双曲线蠕变模型更适合。(2)对重塑饱和粉质黏土进行了等压固结试验,采用不同的围压分级方式,分析了重塑饱和粉质黏土在各向等压条件下的时间变形特性。采用了两种划分主次固结的方法,即“曲线特征法”和“孔压消散法”,通过两种方法确定的次固结变形建立了等压蠕变模型。(3)对重塑饱和粉质黏土进行了三轴剪切蠕变试验,采用不同的偏应力分级方式,通过试验资料分析整理了重塑饱和粉质黏土在三轴剪切条件下的时间变形特性,同时进一步探讨了三轴剪切蠕变试验中的主次固结划分,并建立了三轴剪切蠕变模型。
[Abstract]:A large number of silty clay layers are widely distributed in the coastal areas of China. Due to the obvious time deformation characteristics of silty clay, the engineering built on the silty clay will not only produce large settlement during the construction period.Moreover, the settlement problem after the completion of the project is particularly prominent.Therefore, it is of great practical significance to study the time deformation characteristics of silty clay for post-construction settlement analysis in coastal areas.On the basis of synthesizing the present research situation at home and abroad, the laboratory consolidation tests, isobaric consolidation tests and triaxial shear creep tests were carried out for remolded saturated silty clay in coastal areas of Zhejiang Province.The time deformation characteristics of remolded saturated silty clay are systematically studied.The main contents of this paper are as follows: (1) A one-dimensional consolidation test of remolded saturated silty clay is carried out. Different loading and grading methods are used to study the lateral limit conditions.Effects of different loading and grading methods on time deformation characteristics of remolded saturated silty clay.At the same time, the primary and secondary consolidation process in one-dimensional consolidation test is divided, and the logarithmic and hyperbolic creep model is used to fit the secondary consolidation test data.It is found that the hyperbolic creep model is more suitable for remolding saturated silty clay under isobaric consolidation test. The time deformation characteristics of remolded saturated silty clay under different confining pressure classification methods are analyzed.Two methods of dividing primary and secondary consolidation, namely "curve characteristic method" and "pore pressure dissipation method", are adopted. Through the secondary consolidation deformation determined by the two methods, an isobaric creep model is established. The triaxial shear creep tests of remolded saturated silty clay are carried out.The time deformation characteristics of remolded saturated silty clay under triaxial shear condition were analyzed by using different deviant stress classification methods, and the division of primary and secondary consolidation in triaxial shear creep test was also discussed.A triaxial shear creep model is established.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU442

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