本文關(guān)鍵詞：垃圾堆體固有滲透率及孔隙度演化特征試驗研究　出處：《遼寧工程技術(shù)大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 載荷 生物降解 固有滲透率 孔隙度 協(xié)同表征模型

【摘要】：填埋場內(nèi)氣體流動的孔隙空間——“遷移通道”既受上覆載荷的作用,也同時由于垃圾土骨架自身的降解而發(fā)生改變。如何有效地對垃圾填埋氣體的遷移規(guī)律及氣井的收集效能進行合理評估已成為填埋場沼氣收集和利用工程中的重要研究課題,而定量描述垃圾堆體滲透特性的變化規(guī)律及建立固有滲透率和孔隙度的表征模型是解決這一難點的關(guān)鍵性科學問題之一。本文以多孔介質(zhì)氣-固耦合滲流理論、土力學以及生物降解動力學等多學科交叉理論為基礎(chǔ),以室內(nèi)試驗研究為主導(dǎo),實現(xiàn)了對垃圾堆體固有滲透率和孔隙度的協(xié)同演化過程進行定量化預(yù)測；同時以數(shù)值仿真分析為依托,開展了滲流-應(yīng)力全耦合條件下填埋氣體遷移過程模擬。具體研究成果如下：(1)開展了不同載荷作用下垃圾堆體固有滲透率和孔隙度的協(xié)同演化試驗,建立了固有滲透和孔隙度的定量表征模型,分析了不同含水率條件下固有滲透率和孔隙度的變化規(guī)律。傳統(tǒng)K-C模型無法描述這一變化規(guī)律,而冪函數(shù)形式(κ=AnB)和線性函數(shù)形式(Ig(κ)=a+blg(n))兩種協(xié)同表征模型均與試驗結(jié)果達到了良好的擬合效果；模型尺寸從50mm增大至500mm,固有滲透率從10-15 m2增加至10-12m2,孔隙度從0.378增加至0.685。(2)分析了降解1個月、2個月和3個月后的垃圾固有滲透率和孔隙度的變化規(guī)律,發(fā)現(xiàn)降解時間越長,垃圾堆體固有滲透率和孔隙度下降的幅度越明顯。當含水率為45%時,隨著降解時間的增加,孔隙度最小降低至0.1,同時固有滲透率的變化幅度達到4個數(shù)量級。冪函模型對新鮮垃圾的k-n擬合效果較好,而K-C模型對降解后垃圾的k-n擬合效果較好。(3)構(gòu)建了填埋氣體遷移滲流-應(yīng)力全耦合模型,分析了填埋場氣體遷移規(guī)律,預(yù)測了氣井收集效能,結(jié)果表明：考慮k-n模型的情況下填埋場內(nèi)氣體壓力值高于不考慮k-n模型的情況,封場10年后壓力差值最大達到0.346kPa；由于載荷的作用,氣井平均流量較無載荷作用時偏低14.8%；加入快速滲透層可有效提高填埋氣體的橫向遷移速率,減小填埋氣體的逸散,顯著增加了氣井的收集量。以上研究成果為進一步豐富和完善氣-固耦合條件下填埋氣體遷移演化特征、有效評估垃圾填埋場內(nèi)氣體遷移規(guī)律以及合理設(shè)計填埋氣體的收集控制系統(tǒng)提供了依據(jù)。
[Abstract]:The pore space of landfill gas flow - "migration channel" is affected by the overlying load, also due to degradation of garbage soil skeleton itself and change. How to collect performance of gas migration and landfill gas effectively and reasonable assessment has become an important research topic of landfill gas collection and utilization project the quantitative describe the change rule of landfill seepage characteristics and characterization model of intrinsic permeability and porosity is one of the key issues to solve this problem. In this paper, the porous medium gas solid coupling seepage theory, soil mechanics and biodegradation kinetics of interdisciplinary theory based on experimental study the indoor LED, realizes the process of co evolution of the inherent permeability and porosity on the rubbish heap of quantitative prediction; at the same time according to the numerical simulation analysis Support, carry out the hydro simulation migration force full coupling conditions of landfill gas. The main research results are as follows: (1) to carry out co evolution test under different loads of dustheap intrinsic permeability and porosity, established quantitative characterization of mold intrinsic permeability and porosity, analyzed the variation of intrinsic permeability and porosity under the condition of different water content. The traditional K-C model can describe the change law, and the form of power function (K =AnB) and linear function (Ig (k) =a+blg (n)) of two kinds of collaborative representation model and the test results are up to the good fitting effect; model size increases from 50mm to 500mm. The intrinsic permeability increased from 10-15 m2 to 10-12m2, the porosity increased from 0.378 to 0.685. (2) analysis of the degradation of 1 months. The changes of the 2 and 3 months after the garbage intrinsic permeability and porosity, found that the degradation time longer. The garbage heap decreased the inherent permeability and porosity was more obvious. When the water content is 45%, with the increase of the degradation time, minimum porosity decreased to 0.1, while changes in intrinsic permeability up to 4 orders of magnitude better fitting effect. K-N power function model of fresh garbage, while the K-C model fitting effect of K-N garbage the degradation is good. (3) the migration of landfill gas seepage stress coupling model is established, the analysis of landfill gas migration law, predict the gas collection efficiency, the results show that the value is higher than the K-N model without the landfill gas pressure K-N model under the condition of considering, closed after 10 years of pressure difference the maximum 0.346kPa; because of the effect of load, the average load flow in gas wells is low 14.8%; adding rapid infiltration layer can effectively improve the lateral migration rate of landfill gas, reducing landfill gas escape Scattered, significantly increased the amount of collected gas. The above research results to further enrich and perfect the gas-solid coupling conditions of landfill gas migration and evolution characteristics, provide the basis for the collection of control system for effective assessment of landfill gas migration and reasonable design of landfill gas.

【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU993;TU43

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