寒区冻土水理性质特征参数综合试验研究

发布时间：2018-02-01 19:52

  本文关键词： 冻土水理性质 渗透系数 非闭合孔隙度 初始含水量 黑大呼兰校区　出处：《黑龙江大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文结合前期(近二年)已完成的相关监测研究成果,选择东北典型寒区哈尔滨的黑龙江大学呼兰校区为野外冻土试样采集区及冻土环境控制模拟区,提出两个研究目的:1)提出以冻土渗透系数与冻土非闭合孔隙度为主要测定对象的水理性质参数的量化方法;2)以冻土渗透性为主要议题,识别冻土层水理性质影响因素,严格控制其它因素,开展冻土初始冻结含水量对其非闭合孔隙度以及渗透性影响相关试验研究。在此目标下重点完成了四项研究内容:1)梳理指出以冻土渗透系数、冻土非闭合孔隙度、冻土含冰率、冻土未冻水含量为主要内容的冻土水理性质特征参数的概念。2)通过对试验区前期监测数据的收集与整理,确定了土样密度、温度及级配等室内试验环境边界条件;3)开展低冰点惰性液体的冰点测定试验与融冰性试验共62组,并最终筛选确定出可用于冻土水理参数测定试验的模拟液体;4)设计了以TST-70渗透仪与设计改造后的SPX-400F-B/D1低温恒温箱为主要试验装置的冻土非闭合孔隙度与渗透系数的量化测定试验装置并据之开展两大组22小组试验。最后,总结指出:1)冻土水理性质特征参数试验可以采用冰点为-15.4℃,融冰性较差的30%乙二醇溶液为试验模拟液体;2)可以在-7.5℃温度环境,土样密度为1.36g/cm3的条件下开展冻土渗透系数和冻土非闭合孔隙度测定试验;3)探讨了冻土初始冻结含水量与非闭合孔隙度及渗透系数关系特征,即冻土非闭合孔隙度与渗透系数随土样初始冻结含水量增加而逐渐减小。
[Abstract]:In this paper, based on the related monitoring and research results completed in the early period (nearly two years), the Hulan Campus of Heilongjiang University in Harbin, a typical cold region of Northeast China, is selected as the sampling area of frozen soil samples and the simulation area of frozen soil environment control. Two research objectives: 1) A quantitative method is proposed to measure the hydraulic properties of permafrost and unclosed porosity of permafrost. 2) taking permafrost permeability as the main topic, the factors affecting the hydrological properties of frozen soil are identified and other factors are strictly controlled. The effect of initial frozen water content on the unclosed porosity and permeability of frozen soil was studied. In order to achieve this goal, four items of research content: 1) were carried out, and the percolation coefficient of frozen soil was pointed out. The concept of unclosed porosity, ice content of frozen soil and unfrozen water content of frozen soil is the concept of the characteristic parameters of hydrological properties of frozen soil. 2) through the collection and collation of the monitoring data in the early stage of the test area. The boundary conditions of indoor test environment, such as density, temperature and gradation of soil samples, were determined. 3) A total of 62 groups of freezing point test and melting ice property test were carried out for low freezing point inert liquid, and the simulated liquid which could be used to determine the hydrological parameters of frozen soil was finally selected. 4). A quantitative test device for the determination of unclosed porosity and permeability coefficient of permafrost with TST-70 osmometer and SPX-400F-B/D1 cryogenic incubator after design and modification was designed. To carry out two groups of 22 group trials. Finally. It is pointed out that the freezing point is -15.4 鈩，

本文编号：1482736