岛礁钙质砂、岩混合料工程力学性能研究

发布时间：2018-03-02 02:04

本文关键词： 砂岩混合料钙质砂力学性质振动击实渗透性　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：钙质砂是海洋生物成因、富含碳酸盐类物质的特殊岩土介质,在我国南海海域广泛分布,其工程力学性质与传统陆源砂迥异。在国防和开发海洋资源的过程中,全面、深入的研究砂、岩混合料的工程力学性能,对于指导钙质砂工程的设计、施工,更好的解决海岛筑路材料相关的问题变得尤为重要。本文在对钙质砂研究历程综述的基础上,对钙质砂的物质组成、颗粒形状等基本物理性质进行阐述,通过压缩试验、剪切试验对钙质砂的基本力学性能进行分析。岛礁钙质砂、岩混合料是由粗细颗粒组成、有一定级配的混合料,借鉴前人研究土石混合料等无黏性土的成果,采用重型击实试验、表面振动压实试验和渗透试验对不同粗粒含量、不同最大粒径下的混合料进行分析和探讨,得出了一些对工程实践有指导意义的成果。本文的主要工作如下：(1)对钙质砂的基本物理性质进行了分析。对钙质砂的化学成分、形状、碳酸盐含量和比重进行了测试。对钙质砂的压缩性质进行了分析。对不同初始孔隙比下的钙质砂进行了一维压缩试验,分析了其压缩参数,并与等向压缩进行比较。(2)对钙质砂的剪切特性进行了分析。对钙质砂进行了直剪试验和三轴剪切试验,分析了不同试验下钙质砂的剪切特性和强度并进行比较,同时比较了高压力下钙质砂和石英砂的剪切规律。(3)对钙质砂的压实特性进行了分析。基于钙质砂、岩混合料的组构特征、缩尺原理,对混合料进行了配合比设计,通过调整级配、含水率、最大粒径、粗细颗粒比例,对钙质砂、岩混合料的重型击实特性和表面振动压实特性展开了一系列的室内试验研究,研究其对混合料密度的影响并分析了其压实规律和破碎规律。(4)对钙质砂的渗透特性进行了分析。考虑了混合料的密实度、不均匀系数曲率系数、最大粒径和P5含量,在此基础上提出了钙质砂的渗透系数模型。
[Abstract]:Calcareous sand is a special rock and soil medium rich in carbonate and marine life. It is widely distributed in the South China Sea. The engineering mechanical properties of calcareous sand are quite different from those of traditional continental sand. In the process of national defense and exploitation of marine resources, calcareous sand is widely distributed. It is very important to study the engineering mechanical properties of sand and rock mixture in order to guide the design and construction of calcareous sand engineering and solve the problems related to island road building materials better. The basic physical properties of calcareous sand, such as material composition, particle shape and so on, are expounded. The basic mechanical properties of calcareous sand are analyzed by compression test and shear test. For the mixture with certain gradation, the heavy compaction test, the surface vibration compaction test and the permeation test are used to study the results of the previous researches on the different coarse particles, such as earth-rock mixture, etc. In this paper, the basic physical properties of calcareous sand are analyzed as follows: 1) the chemical composition of calcareous sand is analyzed, and the chemical composition of calcareous sand is analyzed. The shape, carbonate content and specific gravity of calcareous sand were tested. The compressive properties of calcareous sand were analyzed. The shear characteristics of calcareous sand are analyzed by comparing with isotropic compression. The direct shear test and triaxial shear test of calcareous sand are carried out, and the shear characteristics and strength of calcareous sand under different tests are analyzed and compared. At the same time, the shearing law of calcareous sand and quartz sand under high pressure is compared. The compaction characteristics of calcareous sand are analyzed. By adjusting gradation, moisture content, maximum particle size and ratio of coarse and fine particles, a series of laboratory tests were carried out on heavy compaction characteristics and surface vibration compaction characteristics of calcareous sand and rock mixture. This paper studies its influence on the density of mixture and analyzes its compaction law and breaking law. The permeability characteristics of calcareous sand are analyzed. The compactness of mixture, the curvature coefficient of uneven coefficient, the maximum particle size and the content of P5 are considered. On this basis, the permeability coefficient model of calcareous sand is proposed.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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