本文選題：垃圾填埋場　切入點(diǎn)：垃圾土力學(xué)特性　出處：《長沙理工大學(xué)》2015年碩士論文

【摘要】：近年來,我國城市生活垃圾產(chǎn)量正在以較快的速度增長,而衛(wèi)生填埋是城市生活垃圾的主要處理方式,但垃圾填埋場的結(jié)構(gòu)、垃圾土的組成及性質(zhì)、庫區(qū)環(huán)境都比較復(fù)雜,因此,合理分析垃圾體的物理力學(xué)特性,并準(zhǔn)確評價(jià)垃圾填埋場的穩(wěn)定性能,是有效綜合處理城市垃圾中的關(guān)鍵環(huán)節(jié)。本文考慮到現(xiàn)實(shí)問題,對降雨條件下該垃圾填埋場在封場后封蓋系統(tǒng)失效情況下的穩(wěn)定性進(jìn)行了預(yù)測研究。首先根據(jù)國內(nèi)外填埋場垃圾土強(qiáng)度試驗(yàn)及穩(wěn)定性研究文獻(xiàn)和資料,結(jié)合該填埋場實(shí)際,進(jìn)行概化分層,根據(jù)該地區(qū)城市生活垃圾成分表及推定的各層垃圾土物理特性,分別配制了三種不同孔隙比試樣進(jìn)行三軸力學(xué)試驗(yàn),以獲取垃圾試樣的變形、強(qiáng)度參數(shù)。在試驗(yàn)成果基礎(chǔ)上,建立垃圾堆積體概化地質(zhì)模型,分析了降雨情況下該填埋場穩(wěn)定性,此外,根據(jù)己有研究成果,總結(jié)了垃圾填埋場導(dǎo)排系統(tǒng)失效原因以及相應(yīng)的處理措施,為保障其安全穩(wěn)定提供指導(dǎo),本文取得的研究成果具體如下:(1)通過文獻(xiàn)研究,對我國不同地域的垃圾土三相指標(biāo)進(jìn)行了統(tǒng)計(jì)分析,得到了不同地域垃圾土的特點(diǎn)。(2)依據(jù)所研究垃圾填埋場的垃圾成份構(gòu)成比例及其密實(shí)度狀況,配制了孔隙比分別為3.0、2.5和2.0的垃圾土試樣,以此反映該填埋場不同齡期、深度的垃圾土物理特性。通過三軸剪切實(shí)驗(yàn)可發(fā)現(xiàn),垃圾土的粘聚力在14～17kPa之間,內(nèi)摩擦角在24～35°之間。結(jié)合國內(nèi)外已有研究成果及研究地區(qū)特殊的垃圾形成條件,該試驗(yàn)成果具有一定合理性。(3)采用彈塑性模型對垃圾壩及垃圾體在不同降雨工況下的三維應(yīng)力場和位移場進(jìn)行了計(jì)算分析;利用Bishop法計(jì)算了垃圾體邊坡的穩(wěn)定性,分析了垃圾壩在不同工況下的抗滑穩(wěn)定性,得出了垃圾填埋場穩(wěn)定性與降雨強(qiáng)度及其時(shí)序的關(guān)系。(4)降雨條件下垃圾壩穩(wěn)定性主要受垃圾壩上游坡防滲系統(tǒng)的影響。垃圾壩上游坡防滲系統(tǒng)完好時(shí),降雨對邊坡垃圾壩下游坡穩(wěn)定性影響較弱;垃圾壩上游坡防滲系統(tǒng)損壞后,降雨引起的滲濾液水位升高對邊坡垃圾壩下游坡穩(wěn)定性產(chǎn)生重要影響。(5)針對我國垃圾填埋場滲濾液水位壅高、導(dǎo)排系統(tǒng)失效以及淤堵情況嚴(yán)重的普遍現(xiàn)象,提出了滲濾液導(dǎo)排管防堵及清淤措施,并進(jìn)一步闡述了強(qiáng)降雨情況下的應(yīng)急處理措施,為垃圾填埋場的安全穩(wěn)定運(yùn)行提供借鑒和參考。
[Abstract]:In recent years, the output of municipal solid waste (MSW) in China is increasing at a relatively high speed, and sanitary landfill is the main treatment method of MSW. However, the structure of landfill site, the composition and nature of MSW, and the environment of reservoir area are all complicated.Therefore, it is a key link to analyze the physical and mechanical properties of garbage and evaluate the stability of landfill.In this paper, considering the practical problems, the stability of the landfill under the condition of rainfall is predicted under the condition of the failure of the sealing system after the sealing site.Firstly, according to the strength test and stability research literature and data of landfill soil at home and abroad, combined with the actual situation of the landfill site, the general stratification is carried out. According to the composition table of municipal solid waste in this area and the physical characteristics of each layer of garbage soil,In order to obtain the deformation and strength parameters of garbage samples, three kinds of samples with different void ratios were prepared for triaxial mechanical tests.Based on the experimental results, a generalized geological model of garbage accumulation is established, and the stability of the landfill under rainfall is analyzed. In addition, according to the existing research results, the causes of failure of the landfill guiding and drainage system and the corresponding treatment measures are summarized.In order to provide guidance for its safety and stability, the research results obtained in this paper are as follows: 1) through literature research, the three-phase indicators of garbage and soil in different regions of China are statistically analyzed.According to the proportion of garbage composition and compactness of the landfill site studied, the waste soil samples with porosity ratio of 3.0% 2.5 and 2.0% were prepared to reflect the different ages of the landfill site.The depth of the garbage soil physical properties.Through triaxial shear experiments, it is found that the cohesive force of garbage soil is between 14~17kPa and the angle of internal friction is between 24 擄and 35 擄.Combining the existing research results at home and abroad and the special conditions for garbage formation in the research area,The test results are reasonable. The elastic-plastic model is used to calculate and analyze the three-dimensional stress field and displacement field of refuse dam and solid waste under different rainfall conditions, and the stability of refuse slope is calculated by Bishop method.The stability of refuse dam under different working conditions is analyzed. It is concluded that the stability of landfill site is mainly affected by the anti-seepage system of upstream slope of refuse dam under the rainfall condition and the relationship between the stability of landfill site and rainfall intensity and its time series.When the seepage control system of upstream slope of refuse dam is intact, the effect of rainfall on the stability of slope downstream of refuse dam is weak, and after the seepage control system of upstream slope of refuse dam is damaged,The increase of leachate water level caused by rainfall has an important influence on the slope stability downstream of the slope refuse dam. (5) aiming at the common phenomena of high leachate water level, failure of guiding and drainage system and serious silting situation, the leachate water level in landfill sites in China is high, and the situation of blockage is serious.The anti-blocking and silt cleaning measures of leachate guide and discharge pipe are put forward, and the emergency treatment measures under the condition of heavy rainfall are further expounded, which can provide reference and reference for the safe and stable operation of landfill site.
【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】：X705

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