發(fā)布時間：2018-11-11 12:25

【摘要】：垃圾是人類日常生活和生產(chǎn)中產(chǎn)生的固體廢棄物,隨著城鄉(xiāng)一體化進(jìn)程的發(fā)展,社會和經(jīng)濟(jì)的進(jìn)步,越來越多的人口轉(zhuǎn)移到城市,使得城鎮(zhèn)人口不斷的增加,進(jìn)而導(dǎo)致城市垃圾和生活垃圾物產(chǎn)量不斷增多,所以對于垃圾的處理是事關(guān)城市穩(wěn)定成長和人身健康的重要措施。在我國對于垃圾的處理方法主要是垃圾填埋。垃圾填埋場以其具有技術(shù)可靠、經(jīng)濟(jì)節(jié)約、填埋方便和使用廣泛等優(yōu)點(diǎn)成為我國最經(jīng)濟(jì)有效的城市垃圾處理方法。而垃圾填埋場最重要的是邊坡的穩(wěn)定性,邊坡的失穩(wěn)每年都對我國社會經(jīng)濟(jì)和人身傷亡造成重大損失,所以為了保護(hù)人民的生命安全和減少經(jīng)濟(jì)損失,垃圾填埋場的邊坡穩(wěn)定研究是重中之重,而且對于環(huán)境保護(hù)具有重要的意義。本文對國內(nèi)外邊坡穩(wěn)定性分析的背景和進(jìn)展做了闡述,對邊坡破壞模式和破壞機(jī)理進(jìn)行了探討,介紹了國內(nèi)外常用的相關(guān)屈服準(zhǔn)則和邊坡穩(wěn)定性分析方法,主要有數(shù)值模擬分析方法和極限平衡分析法。由于生物降解的作用,導(dǎo)致垃圾填埋場不同深度的強(qiáng)度參數(shù)不盡相同,填埋的越深時間越長的垃圾,降解的程度比后填埋的深,強(qiáng)度參數(shù)更大,所以對其進(jìn)行了研究。隨著現(xiàn)代科學(xué)技術(shù)的迅猛發(fā)展,基于計(jì)算機(jī)的數(shù)值模擬方法也得到了快速發(fā)展。通過室內(nèi)外試驗(yàn)對垃圾試樣進(jìn)行測定,確定了垃圾填埋場進(jìn)行數(shù)值模擬分析所需要的基本物理力學(xué)參數(shù),使用邊坡穩(wěn)定分析方法并通過有限元軟件FLAC3D對錦州市南山垃圾填埋場運(yùn)行過程中和封場后的邊坡穩(wěn)定性進(jìn)行分析研究,主要研究結(jié)論如下:(1)用FLAC3D數(shù)值模擬研究垃圾填埋場的邊坡穩(wěn)定性,充分考慮了生物降解的作用,填埋場垃圾有機(jī)質(zhì)因微生物降解,垃圾土在不同深度土工參數(shù)不盡相同這一因素,對垃圾填埋場在進(jìn)行分層填埋的情況進(jìn)行了邊坡穩(wěn)定性模擬。(2)對邊坡模擬的應(yīng)力和位移進(jìn)行了分析,發(fā)現(xiàn)其豎向最大位移多集中于邊坡的坡頂部位,最大位移值為-4.93m;封場后水平方向的位移多集中于邊坡接近坡腳處,最大位移值為-8.66m,負(fù)值表示與初始設(shè)定的方向相反。而應(yīng)力的大小不管是水平方向還是豎直方向都是隨著埋深的增加而增大的。(3)在生物降解的作用下,對垃圾填埋場進(jìn)行分層處理,然后對其邊坡穩(wěn)定性進(jìn)行了詳細(xì)的研究,得到了邊坡的塑性區(qū)域和滑動面,得出了封場后的安全系數(shù)為1.64,符合相關(guān)規(guī)范所規(guī)定的,并且計(jì)算出運(yùn)營過程中的安全系數(shù)是隨著填埋高程的增加而變小的。
[Abstract]:Garbage is the solid waste produced in the daily life and production of human beings. With the development of urban-rural integration process and the progress of society and economy, more and more people are transferred to the city, which makes the urban population increase continuously. As a result, the output of municipal solid waste and domestic waste is increasing, so the disposal of garbage is an important measure for the steady growth and health of the city. In our country, landfill is the main method of garbage disposal. Because of its advantages of reliable technology, economical saving, convenient landfill and wide use, landfill has become the most economical and effective method for the treatment of municipal solid waste in China. The most important thing in the landfill site is the stability of the slope. The instability of the slope causes great losses to our country's social economy and personal casualties every year. Therefore, in order to protect the safety of the people's lives and reduce the economic losses, The study on slope stability of landfill is the most important and important for environmental protection. In this paper, the background and progress of slope stability analysis at home and abroad are expounded, the failure mode and failure mechanism of slope are discussed, and relevant yield criteria and slope stability analysis methods commonly used at home and abroad are introduced. There are numerical simulation analysis method and limit equilibrium analysis method. Because of the effect of biodegradation, the intensity parameters of different depth of landfill site are different. The deeper the landfill is, the deeper the degradation degree is, and the stronger the intensity parameter is. With the rapid development of modern science and technology, computer-based numerical simulation methods have been developed rapidly. The basic physical and mechanical parameters needed for the numerical simulation analysis of the landfill site were determined by indoor and outdoor tests. Using the method of slope stability analysis and finite element software FLAC3D, the slope stability of Nanshan Landfill site in Jinzhou City during operation and after closure is analyzed and studied. The main conclusions are as follows: (1) FLAC3D numerical simulation is used to study the slope stability of landfill site, and the effect of biodegradation is fully considered. The organic matter of landfill waste is degraded by microorganism. Based on the fact that the soil parameters are different in different depth, the slope stability of the landfill is simulated. (2) the stress and displacement of the slope simulation are analyzed. It is found that the maximum vertical displacement is mostly concentrated at the top of the slope, and the maximum displacement is -4.93 m. The displacement of horizontal direction after closure is mostly concentrated near the slope foot, the maximum displacement value is -8.66 m, the negative value is opposite to the initial direction. However, the magnitude of stress increases with the increase of burial depth, regardless of horizontal direction or vertical direction. (3) under the action of biodegradation, the landfill site is stratified, and the slope stability is studied in detail. The plastic region and sliding surface of the slope are obtained, and the safety factor after sealing is 1.64, which is in accordance with the relevant code, and the safety factor in operation is reduced with the increase of landfill height.
【學(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X705

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