本文關(guān)鍵詞： 凍土水理性質(zhì) 滲透系數(shù) 非閉合孔隙度 初始含水量 黑大呼蘭校區(qū)　出處：《黑龍江大學》2015年碩士論文　論文類型：學位論文

【摘要】：本文結(jié)合前期(近二年)已完成的相關(guān)監(jiān)測研究成果,選擇東北典型寒區(qū)哈爾濱的黑龍江大學呼蘭校區(qū)為野外凍土試樣采集區(qū)及凍土環(huán)境控制模擬區(qū),提出兩個研究目的:1)提出以凍土滲透系數(shù)與凍土非閉合孔隙度為主要測定對象的水理性質(zhì)參數(shù)的量化方法;2)以凍土滲透性為主要議題,識別凍土層水理性質(zhì)影響因素,嚴格控制其它因素,開展凍土初始凍結(jié)含水量對其非閉合孔隙度以及滲透性影響相關(guān)試驗研究。在此目標下重點完成了四項研究內(nèi)容:1)梳理指出以凍土滲透系數(shù)、凍土非閉合孔隙度、凍土含冰率、凍土未凍水含量為主要內(nèi)容的凍土水理性質(zhì)特征參數(shù)的概念。2)通過對試驗區(qū)前期監(jiān)測數(shù)據(jù)的收集與整理,確定了土樣密度、溫度及級配等室內(nèi)試驗環(huán)境邊界條件;3)開展低冰點惰性液體的冰點測定試驗與融冰性試驗共62組,并最終篩選確定出可用于凍土水理參數(shù)測定試驗的模擬液體;4)設計了以TST-70滲透儀與設計改造后的SPX-400F-B/D1低溫恒溫箱為主要試驗裝置的凍土非閉合孔隙度與滲透系數(shù)的量化測定試驗裝置并據(jù)之開展兩大組22小組試驗。最后,總結(jié)指出:1)凍土水理性質(zhì)特征參數(shù)試驗可以采用冰點為-15.4℃,融冰性較差的30%乙二醇溶液為試驗模擬液體;2)可以在-7.5℃溫度環(huán)境,土樣密度為1.36g/cm3的條件下開展凍土滲透系數(shù)和凍土非閉合孔隙度測定試驗;3)探討了凍土初始凍結(jié)含水量與非閉合孔隙度及滲透系數(shù)關(guān)系特征,即凍土非閉合孔隙度與滲透系數(shù)隨土樣初始凍結(jié)含水量增加而逐漸減小。
[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，

本文編號：1482736