人工冻结盐渍土导热系数试验研究及其应用

发布时间：2018-03-01 19:13

本文关键词： 冻结盐渍土导热系数数值模拟 ANSYS软件热线法 TC3000导热系数测试　出处：《安徽理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前,在国内对冻土的研究主要限于冻土的力学性质,对冻土的热力学性质研究较少尤其对冻结盐渍土。随着冻土区的开发、利用,冻土的热学性质研究已经受到了广泛重视。经过实验研究以及理论分析发现冻土在冻结过程中显示的是冻土的热学性质的多变性,造成土体冻结热学性质多变性的原因是由于土的组成成分和物理化学性质。反映土的热学性质通常用土的热学系数来表示,土的热学系数包括：比热(Cd)、容积热容量(C)、导热系数(λ)和导温系数(α)。研究表明,冻土的热学性质不仅与其本身的材料和构造有关,在很大程度上取决于水溶液的含量和性质,水溶液有使土颗粒间接触热阻抗急剧减小的作用。本文是在前人研究的基础上,对前人未涉及的冻结盐渍土在关于土体成分、构造以及水溶液的含量、温度变化等方面进行实验研究分析,来阐明冻土热学性质与土体的几个基本物理参数的相对关系。同时,使用ANSYS大型模拟软件对冻结盐渍土进行温度场的数值模拟,通过观察模拟的土体温度场变化情况来判断冻结盐渍土的导热系数测试准确性,并为以后工程中测试土体温度场提供一种新的有效的方法。实验仪器根据导热系数的测量原理不同,一般分为稳态法和瞬态法。本文实验方法为瞬态法中的瞬态热线法,采用的仪器为西安夏溪公司研制,仪器名称为TC3000的热线法导热系数测试仪。通过实验发现冻结盐渍土的干密度、含水率、土体的盐分种类、含盐量以及土体温度变化对盐渍土的导热系数均有较大的影响,数值模拟的结果也表明实验测量的冻结盐渍土导热系数值比较准确具有较高的可信度,这也为温度场的分析、研究提过了另一个思路,为今后室内盐渍土导热系数的研究提供重大的借鉴意义。
[Abstract]:At present, the study of frozen soil in China is mainly confined to the mechanical properties of frozen soil, but little has been done on the thermodynamic properties of frozen soil, especially on frozen saline soil. The study of thermal properties of frozen soil has been paid more and more attention. Through experimental research and theoretical analysis, it is found that the variation of thermal properties of frozen soil is obvious in the process of freezing. The reason for the variability of soil freezing thermal properties is due to the composition and physical and chemical properties of the soil. The thermal properties of the soil are usually expressed by the thermal coefficient of the soil. The thermal coefficients of the frozen soil include: specific heat transfer, volumetric heat capacity, thermal conductivity (位) and thermal conductivity (伪). The results show that the thermal properties of the frozen soil are not only related to its own material and structure, but also depend to a great extent on the content and properties of the aqueous solution. Aqueous solution has the effect of decreasing the contact thermal impedance between soil particles. On the basis of previous studies, this paper makes an experimental analysis on the composition, structure, water content and temperature change of frozen saline soil, which is not involved in previous studies. To clarify the relative relationship between the thermal properties of frozen soil and several basic physical parameters of soil. At the same time, the temperature field of frozen saline soil is simulated with ANSYS software. The accuracy of thermal conductivity measurement of frozen saline soil is determined by observing the variation of soil temperature field. It provides a new and effective method for measuring the temperature field of soil in future engineering. According to the measuring principle of thermal conductivity, the experimental instrument is generally divided into steady-state method and transient method. The instrument is developed by Xiaxi Company, Xi'an. The instrument is called TC3000. It is found that the dry density, moisture content, soil salt type, salt content and temperature change of frozen saline soil have great influence on the thermal conductivity of saline soil. The results of numerical simulation also show that the experimental measurements of the thermal conductivity of frozen saline soil have high reliability, which is another idea for the analysis of temperature field. It provides great reference for the study of thermal conductivity of indoor salinized soil in the future.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU44;TU411

【参考文献】

中国期刊全文数据库前10条

1 刘为民,何平,张钊;土体导热系数的评价与计算[J];冰川冻土;2002年06期

2 邓友生,何平,周成林;含盐土导热系数的试验研究[J];冰川冻土;2004年03期

3 温智,盛煜,马巍,邓友生,吴基春;青藏高原北麓河地区原状多年冻土导热系数的试验研究[J];冰川冻土;2005年02期

4 张忠进，，郎敏;断电热线法测试材料导热系数的研究[J];东北电力学院学报;1995年04期

5 赵晓彤,赵景林,孙灵芳,徐志明,杨善让,宋之平;均匀粒径堆体积热导率的实验研究[J];东北电力学院学报;1997年03期

6 沈珍瑶,李国鼎,李书绅;高压实膨润土的导热性能[J];大坝观测与土工测试;1998年03期

7 彭担任,赵全富,胡兰文,王钦福,贺本军;煤与岩石的导热系数研究[J];矿业安全与环保;2000年06期

8 唐明云;张国枢;张朝举;束永保;邱进伟;;平行热线法测定松散煤体导热系数试验[J];矿业安全与环保;2006年05期

9 王补宣,虞维平;热线法同时测定含湿多孔介质导热系数和导温系数的实验技术[J];工程热物理学报;1986年04期

10 张婷;杨平;;不同因素对浅表土导热系数影响的试验研究[J];地下空间与工程学报;2012年06期