淮河入江水道崇湾段特殊软土的物理力学性状试验研究

发布时间：2018-07-12 16:07

本文选题：特殊黏土 + 有机质　；参考：《东南大学》2015年硕士论文

【摘要】：淮河入江水道运河西堤崇湾段建成至今经历了多次滑坡,并一直处于沉降状态,堤坝始终难以达到防洪设计要求。为对该段堤坝进行更为有效的加固处理,本研究针对淮河入江水道崇湾段堤坝的主要问题土层开展物理力学试验研究。本文的主要研究工作如下：(1)研究了淮河入江水道崇湾段特殊软土6.5 m和13 m两不同深度土体的物理性状,明确了有机质含量高和具有一定膨胀性的特殊性状。同时,针对两个深度的原状样进行了压缩-回弹试验和三轴固结不排水剪切试验,分析了其压缩-回弹特性及抗剪强度性状。(2)开展了淮河入江水道崇湾段两个深度不同初始含水率重塑土的压缩试验,并与原状土的压缩特性进行比较分析,研究了结构性对淮河入江水道崇湾段特殊软土力学性状的影响。引入了Burland固有压缩理论和拓展固有压缩线,对该特殊软土的压缩特性进行分析,探讨了有机质土压缩曲线的归一化性状以及固有压缩参数随土体液限、有机质含量的变化规律。(3)通过人工制备有机质土,研究了不同有机质对土体物理特性的影响,分析了土体的液塑限及塑性指数随腐植酸钾含量增加而变大的规律,发现了随有机质含量的增加土体的压缩性增大、渗透性减小和固结完成所需时间延长的变化规律,探讨了有机质对工程建设及工程构筑物使用的不良影响。
[Abstract]:Since the completion of the western section of the Huaihe River Canal, the Ticong Bay section has experienced many landslides and has been in a state of settlement. The dike is always difficult to meet the requirements of flood control design. In order to strengthen the dyke more effectively, the physical and mechanical tests were carried out on the main soil layer of Chongwan section of Huaihe River. The main research work of this paper is as follows: (1) the physical properties of special soft soil at 6. 5 m and 13 m depths in Chongwan section of Huaihe River into the Yangtze River are studied, and the particularity of high organic matter content and certain expansibility is determined. At the same time, compression-springback test and triaxial consolidation undrained shear test were carried out for two depth undisturbed samples. The compression-resilience and shear strength properties of the soil are analyzed. (2) Compression tests of remolded soil with different initial moisture content at two depths in Chongwan section of Huaihe River waterway are carried out, and the compression characteristics of the soil are compared with those of the undisturbed soil. The influence of structure on the mechanical properties of special soft soil in Chongwan section of Huaihe River channel was studied. The Burland inherent compression theory and the extended inherent compression line are introduced to analyze the compression characteristics of the special soft soil. The normalized properties of the compression curve of organic matter soil and the inherent compression parameters with the liquid limit of the soil are discussed. (3) the effect of different organic matter on the physical properties of soil was studied by artificial preparation of organic soil, and the rule that the liquid plastic limit and plastic index of soil increased with the increase of potassium humate content was analyzed. With the increase of the content of organic matter, the variation law of soil compressibility, the decrease of permeability and the extension of consolidation time are found, and the adverse effects of organic matter on engineering construction and the use of engineering structures are discussed.
【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】：TV221.2

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