水电站混凝土面板堆石坝冰碛砾岩冲击碾压填筑工艺试验研究

发布时间：2018-02-02 14:13

本文关键词： 冰碛砾岩冲击碾压颗粒级配干密度渗透系数　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：近三十年内,随着工业、农业、运输等领域对水利水电的需求逐渐增大,堆石坝的数量越来越多,坝体的高度也越来越高。众所周知,随着堆石坝坝体的增高,控制其变形的难度也越来越大。因此,为控制坝体的变形,协调两岸与坝体的变形,防止出现过大沉降或不均匀沉降,优选筑坝材料和施工方法就显得尤为重要。本课题研究中涉及的某水电站混凝土面板堆石坝最大坝高219.0m,在国内外目前属特高型坝,根据初步的技术与经济方案比较,在可研阶段试验结果的基础上,决定采用离坝址不远的栗山坡料场的冰碛砾岩为坝体堆石料,碾压方式采用冲击碾压。物理室内试验结果显示,冰碛砾岩基本物理力学特性满足筑坝堆石料的要求。采用冰碛砾岩作为堆石坝堆石料,在国内外目前尚属首例,无实践工程经验可借鉴。且据规范要求：“对特别高的坝,或筑坝材料性质特殊,已有经验不能覆盖的情况,其填筑标准应作专门论证。”因此,为取得合理的填筑碾压参数,特进行了本课题的试验研究工作。本次冰碛砾岩冲击碾压专项试验,共选择3大场,每场次合理布置填筑材料铺筑厚度控制点和沉降测量控制点,洒水量为15%,并通过现场的颗粒级配试验、密度试验、含水率试验、渗透试验和沉降量观测,求得不同碾压遍数下填筑材料的颗粒级配、干密度、含水率、渗透系数和沉降量,并通过这些数据的对比,得出填筑材料碾压前、后的颗粒级配对比关系图和碾压后干密度、渗透系数、沉降量与碾压遍数的关系及其曲线图。最终,在干密度和渗透系数满足堆石坝坝体设计要求的情况下,确定了冰碛砾岩冲击碾压施工参数。
[Abstract]:In the past 30 years, with the increasing demand for water conservancy and hydropower in the fields of industry, agriculture and transportation, the quantity of rockfill dams is increasing, and the height of rockfill dams is becoming higher and higher. As we all know, with the increase of rockfill dam body. Therefore, in order to control the deformation of the dam body, coordinate the deformation between the two sides of the dam and the dam body to prevent excessive or uneven settlement. It is very important to select the construction material and construction method. The maximum dam height of concrete face rockfill dam of a hydropower station involved in this subject is 219.0m. at present, it belongs to super high dam at home and abroad. According to the comparison of preliminary technical and economic schemes and on the basis of the experimental results of the study stage, it is decided that moraine conglomerates of the Li-hillside material range not far from the dam site will be used as the dam body rockfill materials. The physical laboratory test results show that the basic physical and mechanical properties of moraine conglomerate can meet the requirements of rockfill. Using moraine conglomerate as rockfill material of rockfill dam is the first case at home and abroad, and no practical engineering experience can be used for reference. If the experience can not be covered, the filling standard should be specially demonstrated. "therefore, in order to obtain reasonable filling rolling parameters." The experiment and research work of this subject has been carried out in particular. In this special experiment of impact rolling of moraine conglomerate, three large fields are selected, and each site reasonably arranges the control points of the thickness of filling materials and the control points of settlement measurement. The particle gradation, dry density and moisture content of the filling materials under different rolling times were obtained by particle gradation test, density test, water content test, penetration test and settlement observation. Through the comparison of these data, the relationship diagram of particle gradation before and after compaction and the dry density and permeability coefficient after compaction are obtained. Finally, under the condition that dry density and permeability coefficient meet the design requirements of rockfill dam body, the parameters of impact rolling construction of moraine conglomerate are determined.
【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】：TV641.43

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