本文關(guān)鍵詞：降雨條件下某垃圾填埋場飽和—非飽和滲流場特性研究　出處：《長沙理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 垃圾填埋場 非飽和滲流 土水特征曲線 暫態(tài)水壓力

【摘要】：國內(nèi)大部分垃圾填埋場存在表層覆蓋層破壞以及排水設(shè)施淤堵問題,在降雨條件下雨水直接進入填埋場而未能有效排出,導(dǎo)致填埋場水位升高引起堆體暫態(tài)水壓力過大�，F(xiàn)有研究表明垃圾堆體暫態(tài)水壓力過大是引起垃圾體失穩(wěn)的重要原因之一。為了解垃圾填埋場在降雨條件下的暫態(tài)地下水位變化特性以及垃圾壩壩前水荷載分布情況,基于西南地區(qū)某垃圾填埋場垃圾土成分構(gòu)成,對不同孔隙比垃圾土進行非飽和滲透試驗研究以及二維、三維滲流場數(shù)值計算和研究,本文主要研究工作和結(jié)論如下:(1)通過文獻研究,歸納總結(jié)了國內(nèi)外垃圾填埋場滲濾液運移變化規(guī)律,研究了垃圾填埋場滲流導(dǎo)致的工程破壞的機理和機制。(2)采用室內(nèi)飽和滲透試驗和非飽和滲透試驗方法分別研究了孔隙比為2.0、2.5和3.0的垃圾土飽和—非飽和滲透特性,研究表明:室內(nèi)試驗中垃圾土因存在的大量有機成分是導(dǎo)致垃圾土非飽和滲透系數(shù)和殘余含水量偏大的主要原因。(3)采用飽和非飽和非恒定滲流理論研究了某垃圾填埋場在不同降雨條件下的地下水位分布和變化特性以及垃圾壩前水荷載分布情況,研究成果表明:填埋場在降雨前的初始滲濾液水位(對應(yīng)填埋場滲濾液導(dǎo)排系統(tǒng)工作狀態(tài))對運行過程中降雨入滲導(dǎo)致的水位升高、垃圾體內(nèi)的孔隙水壓力及壩前水荷載分布有重要影響;規(guī)模較小的山谷型填埋場在遭遇暴雨和久雨情況下,滲濾液水位將快速抬升,并在填埋場中形成過高的暫態(tài)地下水位;降雨總量相當(dāng)情況下,連續(xù)久雨比短時暴雨對填埋場穩(wěn)定性更為不利。(4)通過對垃圾填埋場滲流場變化過程的動態(tài)分析,研究了垃圾壩壩前水荷載的空間分布規(guī)律,為垃圾壩穩(wěn)定性分析提供了基礎(chǔ)資料。
[Abstract]:Most of the landfills in China have the problems of overburden destruction and blockage of drainage facilities. Rain water enters the landfill directly under rainfall conditions and can not be discharged effectively. The current research shows that excessive transient water pressure is one of the important reasons for the instability of refuse. In order to understand the transient water pressure in the landfill site under rainfall conditions, one of the important reasons. The variation characteristics of groundwater level and the distribution of water load in front of refuse dam. Based on the composition of refuse soil in a landfill in southwest China, unsaturated permeability test and numerical calculation and study of two-dimensional and three-dimensional seepage field were carried out for different void ratios. In this paper, the main research work and conclusions are as follows: (1) through the literature research, summarized the domestic and foreign landfill leachate migration changes. The mechanism and mechanism of engineering failure caused by landfill seepage were studied. (2) the porosity ratio of 2.0 was studied by indoor saturated permeability test and unsaturated permeability test. 2. 5 and 3. 0 saturated-unsaturated permeability of MSW soil. The results show that the large amount of organic components in the MSW soil is the main reason for the high unsaturated permeability coefficient and residual water content in the MSW soil. The distribution and variation of groundwater level in a landfill under different rainfall conditions and the distribution of water load in front of a refuse dam are studied by using saturated unsaturated unsteady seepage theory. The research results show that the initial leachate water level (corresponding to the working state of landfill leachate guide and drainage system) in the landfill before rainfall increases the water level caused by rainfall infiltration. The pore water pressure and the distribution of water load in front of dam play an important role in MSW. In the case of heavy rain and prolonged rain, the leachate water level will rise rapidly in the small valley landfill, and the transient groundwater level will be too high in the landfill. When the rainfall amount is equal, the stability of landfills is more unfavorable than that of short term rainstorm.) the dynamic analysis of the seepage field variation process of landfill site is carried out. The spatial distribution of the water load in front of the refuse dam is studied, which provides the basic data for the stability analysis of the refuse dam.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU43

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