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INTRODUCTIONTheTianzilingwastelandfillbuiltin 1991toproperlydisposeofmunicipalsolidwaste(MSW)hasadesignedservicelifeof13years.Itwasfilledstagebystageatthebeginningoftheelevationof 50 .5m .Bynow ,thelandfillhasreachedthelevelof 10 2 .5m ,whichex ceedst… 相似文献
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张永兴 《重庆大学学报(英文版)》2003,2(2)
1. Introduction In October 2000, the Chongqing government received an exciting message. The Planning Committee of China approved the feasibility reports on Changshengqiao sanitary landfill projects supported by a loan from World Bank. This indicates that the Chinese government and local governments of different ranks have come to realize the importance of city environment and sanitation, and it also stands for the termination of simple and easy landfills. Before 2015, two modern sanitary l… 相似文献
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The quantitative and qualitative composition of Chinese municipal solid waste （MSW） differs significantly from German waste. The focus of this paper is on whether these differences also lead to dissimilar qualities of leachates during storage or landfilling. Leachates ingredients determine the appropriate treatment technique. MSW compositions of the two cities Guilin （China） and Essen （Germany）, each with approx. 600000 inhabitants, are used to simulate Chinese and German MSW types. A sequencing batch reactor （SBR） is used, combining aerobic and anaerobic reaction principles, to test the biodegradability of leachates. Leachates are tested for temperature, pH-value, redox potentials, and oxygen concentration. Chemical oxygen demand （COD） values are determined. Within 8 h, the biodegradation rates for both kinds of leachates are more than 90%. Due to the high organic content of Chinese waste, the degradation rate for Guilin MSW leachate is even higher, up to 97%. The effluent from SBR technique is suitable for direct discharge into bodies of water. 相似文献
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The evaluation of the seismic stability of an expanded municipal solid waste （MSW） landfill is very important in seismic prone zones. In this paper, the pseudo-dynamic method was used to calculate the average safety factor for the expanded landfill with a trapezoidal berm based on under-berm failure conditions. Furthermore, the effects of the variation of parameters such as the amplification factor, seismic coefficient, height of berm, angle of back slope of berm, and depth of waste mass at the back slope on the seismic stability of the landfill were studied. The results indicated that the influences of the vertical seismic coefficient, height of berm, and angle of the back slope of the berm on the seismic stability of the landfill are weakened as the amplification factor increases, but the influence of the horizontal seismic coefficient on the seismic stability of the landfill is strengthened. On the other hand, a certain ratio of the height of the waste mass above the back slope to the depth of waste mass at the back slope, or the reasonable consideration of the magnitude of the amplification factor will be conducive to the seismic design of the landfill. In addition, the results obtained by the pseudo-static and pseudo-dynamic methods were compared. 相似文献
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Moisture retention capacity (MRC) is a key parameter for the prediction of leachate production of a municipal solid waste (MSW) pile. In this paper, five sets of laboratory tests were conducted in compression cells to characterize the variation of MRC with degradation time and overburden stress. Set A was conducted on the fresh high-food-waste-content (HFWC)-MSW under different degradation conditions and a sustained stress; Set B was on the fresh HFWC-MSW by alternation of degradation time and incremental stresses; Sets C, D, and E were on fresh HFWC-MSW, zero-food-waste-content (NFWC)-MSW, and decomposed MSW, respectively, being subjected to incremental stresses. The following findings were obtained from the test results: (1) The MRC of fresh HFWC-MSW decreased exponentially with degradation time under a sustained stress. The higher waste temperature or oxygen introduction would result in a faster declining of MRC. (2) The MRCs decreased linearly with a logarithmic increase of stress for all the MSW samples with different food waste contents. The MRC of HFWC-MSW was higher than that of NFWC-MSW under a given stress, and the decomposed MSW took the second place. (3) The variation of MRC appeared to be independent of stress path in terms of stress and degradation time. Based on the test results, the dependencies of the MRC of HFWC-MSW on degradation and stress were interpreted. Then, a time- and stress-dependent model was proposed for predicting the MRC of HFWC-MSW. The model was relatively simple and convenient for design purposes, and was verified by the measured data of leachate production at the pretreatment container of Laogang Incineration Plant. Finally, the model was developed to evaluate the dewatering effect of the HFWC-MSW pile. The strategy of combining the degradationenhancing measures with stress-increasing measures is recommended in a rapid dewatering project. 相似文献
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土木工程岩土工程方向周口店地质实践教学探讨 总被引：6，自引：1，他引：6
根据岩土工程的特点和我校的地质教学资源优势,构建以地质为特色的岩土工程专业方向具有竞争优势,周口店地质实习基地丰富而优质的教学资源是构建地质特色岩土工程方向的基本保障。根据多年的周口店地质实习教学体会,提出了适于岩土工程专业方向的周口店地质教学实习内容、要求和相应的实习时间,以供探讨。 相似文献
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详细介绍了基于尿素水解的微生物诱导碳酸钙沉淀技术(MICP)基本原理;系统总结了MICP技术在土体加固、文物保护、混凝土裂缝修复、金属污染土修复和海洋岩土工程等领域的室内和现场试验研究;分析了环境pH值、温度、钙盐种类、加固土体颗粒粒径和灌浆方法等因素对MICP 技术的影响。MICP技术在岩土工程领域具有广阔的应用前景,但该技术在试验及在实际工程应用领域,特别是在海洋岩土工程领域还存在均匀性、环境适应性、耐久性、经济适用性等方面问题,未来需要对这些问题进行深入的探讨和研究。 相似文献
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根据福州市近年垃圾产量与成分,分析福州市生活垃圾焚烧可能出现的问题,提出应首先进行分类才能保证生活垃圾焚烧健康、稳定进行,建议采用分步走的方案。为了开展垃圾分类要教育、发动学生,媒体、各种环保组织和社区进行宣传发动和组织,政府建立相应的法规、政策以及采取相应的措施,实施垃圾分类和综合利用才能确保垃圾焚烧良性发展。 相似文献
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XIAO Cheng-zhi LUAN Mao.tian YANG Qing PEI Jian-jun 《重庆大学学报(英文版)》2005,4(3):139-143
1 Introduction 1 The sheet type geogrids, which are characterized by grid structures with apertures of (10 to 100) mm between longitudinal and transverse ribs respectively are made from pre-extruded high density polyethylene sheets by punching and drawing process, and the drawing process forms the structures of grid and enhances the tensile strength of geogrids to a grea extent. Since the geogrids possess high tensile strength in nature, they are widely used as reinforcement in segmental retai… 相似文献
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Sanitary landfilling is the most important method of municipal solid waste disposal in China. Landfill sites are always set
up in mountain valley, on plain or beside seashore. A complete landfill consists of base system, cover system, and leachate
collection and gas extraction system. This paper reviews the state-of-the-art landfilling technology in China and collection
discusses research projects for engineers.
Project(59878050) supported by National Natural Science Foundation of China(NSFC) 相似文献
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美国普瑞细斯系列测试是一项针对中小学教师的测试,其目的是为了给各级教育当局认证教师资格、颁发教师资格证书提供帮助。它分为教师职前技能测试、学科知识评估考试和课堂教学评价三个项目,具有强大的理论支持、良好的操作性能和有效的测试结果三个特点。我国教师资格考试可以从考试内容的全面性、考试对象的广泛性、过程性评价贯穿于考试之中和评价的连续性几方面加以借鉴。 相似文献
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The safety of water quality in the Three Gorges Reservoir(TGR)is very important.Protections and remediation of environment safety are very crucial for guaranteeing TGR environmental quality.When piled municipal solid waste(MSW) dumps are submerged without treatment,pollutants in the MSW will leach into the water and threaten the water safety of the reservoir.Based on the surveys of the amount,distribution and characteristics of piled MSW in the TGR area,this study focusing on the MSW dumps at the water leve... 相似文献
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引入一种新的预测垃圾产量的方法——组合预测方法,该法能够综合利用不同预测方法提供的信息提高预测精度。结合厦门市1996～2008年的垃圾产量,分析不同预测方法的预测精度,并预测5年后的垃圾产量。通过研究发现:单一预测模型中,线性回归法和年增长率法的预测结果偏小,误差较大,灰色理论GM(1,1)的预测结果偏大,误差较小,基本在10%以内;组合预测模型的预测精度高于单一预测模型;厦门市城市生活垃圾年平均增长率约为10%,低于国民生产总值和社会消费品零售总额年平均增长率,高于城镇居民消费性支出年平均增长率。 相似文献
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陆江 《浙江大学学报(A卷英文版)》2004,5(3):303-308
Geotechnical research on historical remains can provide new data and distinctive viewpoint for research on soil mechanics. Two Jiangnan Tu-Dun tombs historical remains were investigated by means of in situ and laboratory geotechnical tests. In the present paper the geotechnical properties of these man-made earthworks, especially ageing effect on consolidation and direct shear, and compaction properties of earth fill are discussed. 相似文献
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基于开展岩土工程学科教学和科研的试验要求,研制了地质力学模型试验台。该试验台采用了微机电液伺服控制、多油缸均布加载技术,具有整体刚度好、受载均匀、控制稳定等特点。介绍了与之配套的试验关键技术和在隧道围岩稳定性研究方面的应用情况,表明模型试验台功能能够满足试验要求。 相似文献
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《工程爆破》课程教学方法及教学效果探讨 总被引：1，自引：0，他引：1
《工程爆破》是西南石油大学土木工程（岩土工程）专业学生的一门任选课。以2007级土木工程（岩体工程方向）班为例,在该课程教学过程中采用理论教学与实践教学相结合、板书与多媒体教学相结合以及专业教育与爱国主义教育相结合的＂三结合＂教学方法,考试总评成绩表明该教学方法所反映的教学效果良好,达到了该课程大纲对该专业学生的要求。 相似文献