湿地湖泊相软土加固离心模型试验研究和对比

发布时间：2018-05-22 18:11

本文选题：湖泊相软土地基 + 离心模型试验　；参考：《河北工业大学》2014年硕士论文

【摘要】：湖泊相湿地（或古湖泊相湿地）在我国的南北部地区广泛的分布，并形成了沼泽性的湿地软土或软粘土。和东部沿海的平原地区所广泛分布的软土有所不同，平原的湖泊湿地地区的公路软土地基有它自己较为鲜明的特点，，主要会以两种形式出现：第一种为分布于河流两岸的漫滩淤积地带，另一种为分布于古平原内陆湖泊边缘地带及一些低洼地区，即是常说的平原湿地。目前全国有多条高速公路或铁路穿越过湖泊湿地，该路段的软土或软弱土地基，会带来大量沉降，而且达到沉降稳定的时间比较长、使得成本增加以及出现运行期间工程质量事故等隐患。本论文研究对象“邢衡高速”衡水段临近衡水湖，土体主要由粉土、粘土和粉质粘土构成，由于粘土层含水率较高，为典型的湖泊相软土，因而处理方式的选择成为本项目的主要研究方向。本文通过离心模型试验的方法，系统研究不同高速公路路基处理方法对本段试验段公路后期沉降产生的影响，即采用水泥搅拌桩方式和真空堆载联合预压方式处理，并观测湖泊相软土地基加固的工后沉降影响情况，进而以此为基础研究“刑衡高速”衡水段的路基处理方法的选择。研究结论对于弥补现行处理方法的不足具有重要的理论意义和工程实用价值，同时对于加快路基土固结，减少工后沉降具有十分重要的意义。
[Abstract]:The lacustrine wetland (or paleo-lacustrine wetland) is widely distributed in the north and south of China and forms marsh soft soil or soft clay. Different from the soft soil widely distributed in the eastern coastal plain area, the highway soft soil foundation in the plain lake wetland area has its own distinct characteristics. There are two main forms: the first is the floodplain silting zone on both sides of the river, the other is the plain wetland, which is distributed in the edge of the inland lake and some low-lying areas of the ancient plain. At present, there are many highways or railways across the country that have passed through lakes and wetlands. The soft soil or soft soil foundation of this section of the road will bring a great deal of settlement, and it will take a long time for the settlement to stabilize. Causes the cost to increase as well as appears during the operation the project quality accident and so on hidden danger. The research object of this paper is "Xingheng High-speed" Hengshui section near Hengshui Lake, the soil is mainly composed of silt, clay and silty clay, because of the high moisture content of clay layer, it is a typical lacustrine soft soil. Therefore, the choice of processing mode has become the main research direction of this project. In this paper, the influence of different highway subgrade treatment methods on the late settlement of highway in this section is studied systematically by centrifugal model test, that is, cement mixing pile and vacuum surcharge combined preloading are adopted. The influence of post-construction settlement on the reinforcement of lake soft soil foundation is observed, and the choice of subgrade treatment method in Hengshui section of "Criminal Heng Heng High Speed" is studied. The conclusion of the study is of great theoretical significance and engineering practical value to make up for the deficiency of current treatment methods, at the same time, it is of great significance to accelerate the consolidation of subgrade soil and reduce the settlement after construction.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

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