共查询到19条相似文献，搜索用时 203 毫秒
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聚苯乙烯泡沫塑料轻质填土(SLS)的特性 总被引：22，自引：10，他引：22
为了寻求“不进行地基处理的软基处理方法”,通过减轻路堤填土重量来提高软基的稳定性和减少沉降.研究了聚苯乙烯泡沫塑料轻质填土SLS的轻质、高强、变形间的相关关系,找出有工程应用前景的配方.通过和常规路堤填土的比较,对SLS的工程性质进行了评价.特别从环保角度出发,探讨了利用废泡沫塑料碎粒的可能性. 相似文献
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聚苯乙烯泡沫塑料轻质填土（SIS）的特性 总被引：6，自引：1，他引：6
为了寻求“不进行地基处理的软基处理方法”，通过减轻路堤填土重量来提高软基的稳定性和减少沉降，研究了聚苯乙烯泡沫塑料轻质填土（SLS）的轻质，高强，变形间的相关关系，找出有工程应用前景的配方，通过和常规路堤填土的比较，对SLS的工程性质进行了评价，特别从环保角度出发，探讨了利用废泡沫塑料碎粒的可能性。 相似文献
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用废聚苯乙烯泡沫制备胶粘剂 总被引：1，自引：0，他引：1
本文研究了回收废旧聚苯乙烯(PS)泡沫塑料制备PS胶粘剂的方法。以废旧聚苯乙烯泡沫塑料为主要原料,选择低毒性、相溶性好的有机溶剂,使其溶解,再与聚乙烯醇(PVA)水溶液共混,制得水包油乳液。加入不同改性材料,制得改性胶粘剂。 相似文献
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高填土下刚性结构物竖向土压力减荷方法 总被引：4，自引：0，他引：4
提出在结构物顶部填筑聚苯乙烯泡沫塑料（EPS）来减轻上埋式结构物土压力的方法。利用数值分析的手段给出了采用该法后结构物周边上压力的变化，及可供设计参考的土压力计算值。 相似文献
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SLS路堤的稳定性和沉降分析 总被引：7，自引：0，他引：7
聚苯乙烯泡沫塑料轻质填土(SLS)路堤是继发泡塑料(EPS)路堤之后发展起来的“不进行地基处理的路堤软基处理方法”。在文献[1]基础上,笔者对SLS路堤进行了稳定分析和沉降计算,并与常规填土路堤的相应成果进行了比较。在此基础上讨论了该类路堤的设计计算方法,作为今后将这种材料进一步应用于工程的技术准备。 相似文献
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聚胺脂泡沫塑料在酸性介质中具有对金的吸附率高、稳定性好的特点,已成为室内富集游离金的重要方法之一。近几年来,作者根据金矿体上部土壤和正常土壤中游离金的差异,初步试验成功了在野外现场用泡沫塑料吸附找金的新方法。该方法简单易行,成本低,是一种直接找金的方法。文中重点介绍了在已知金矿床上的试验结果。 相似文献
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1985年以来,在试用地电化学取样找金过程中,发现并试验成功了用聚胺酯泡沫塑料取样找金的新方法。介绍如下。地电化学取样的启示根据文献[1]进行地电化学取样试验时,我们发现,由于炭棒周围土壤性质和湿度的不同,造成炭棒上附着物在量上差别很大。在相同情况下进行的条件试验表明,所测得的样品金含量与采样量成反比(图1)。针对这个问题,我们探索了用聚胺酯泡沫塑料 相似文献
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Aly Ahmed 《Geotechnical and Geological Engineering》2012,30(4):963-973
A proposed regression model was developed based on experimental data using regression analysis method to predict the strength of sand reinforced with strips of waste polystyrene plastic type. Three different variables were studied to investigate the behavior and strength of reinforced sandy soil with waste plastic strips. These are the content, size and aspect ratio of plastic strips. For this purpose, a series of unconfined compression and splitting tensile tests were conducted on unreinforced and reinforced sand specimens. Test results showed that using strips of waste plastic polystyrene type improved the strength of the tested soil. Increasing content of waste plastic has a more significant effect on the enhancement of splitting tensile strength compared to the enhancement of compressive strength. Content, size and aspect ratio of waste plastic strips have significant effects on the improvement of strength. Utilization of such waste plastic type, which polystyrene, in this way will help in reducing the quantity of solid waste as well as reducing the cost of ground improvement. Results showed that multiple linear regression models can accurately predict the strength of sand reinforced with waste plastic strips within the range of the studied variables in this paper. Consequently, using such regression models will save time as well as reduce laboratory costs. 相似文献
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Hkon Hartmark 《Engineering Geology》1979,13(1-4):505-517
The modern operation of railways with speeds of more than 100 km/h with all-welded rails and concrete sleepers demands a railway line completely free of frost heave. On railway lines in service (in operation), protection against frost is achieved by materials demanding only a minimum insulation depth, i.e., peat, bark, discarded sleepers or foam plastic. The combination of foam plastic with a gravel layer beneath is the most widely used method plastic. The combination of foam plastic with a gravel layer beneath is the most widely used method today.
Since 1945 the Norwegian State Railways have carried out frost protection works as shown in Table I. In Sweden and Finland systematic frost protection work has been carried out, mainly on the same principles as in Norway.
This paper describes the methods being used in railway construction with dimensional diagrams for frost insulation. 相似文献
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泡沫流变模型试验研究 总被引：2，自引：0，他引：2
泡沫流变模型是进行泡沫钻井流变和水力参数计算、指导实际作业的理论基础。通过室内精确测试泡沫流过模拟实钻循环管路压差和流速的变化对泡沫流变性进行研究，结果表明，泡沫流体可用幂律假塑性模型和宾汉塑性模型来表征，以幂律假塑性模型最接近实际流变性。 相似文献
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根据钻探工作的需要，在实验室内利用自制的泡沫流变装置测定了泡沫的流型，证明了泡沫属非牛顿流体，其流变参数随气液比、泡沫剂加量的改变而改变，其它添加剂也影响泡沫的流变性能，最后讨论了测试结果对泡沫钻进的指导作用。 相似文献
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Juliana Assunção Ivar do Sul Isaac R. Santos Ana Cláudia Friedrich Alexandre Matthiensen Gilberto Fillmann 《Estuaries and Coasts》2011,34(4):814-823
Sea turtles are highly susceptible to plastic ingestion and entanglement. Beach debris were surveyed along the most important
sea turtle nesting beaches in Brazil (Costa dos Coqueiros, Bahia State). No significant differences among developed and undeveloped
beaches were observed in terms of total number of items. Local sources (tourism activities) represented 70% of debris on developed
beaches, where cigarette butts, straws, paper fragments, soft plastic fragments, and food packaging were the most abundant
items. Non-local sources (domestic and fishing activities) accounted for about 70% of debris on undeveloped beaches, where
the most abundant items were rigid plastic fragments, ropes, soft plastic fragments, caps, and polystyrene. The projected
surface area of beach debris did not vary among developed and undeveloped beaches. Overseas containers accounted for about
25% of regional plastic pollution, implying that international pollution prevention agreements are not being respected off
the Brazilian coast. 相似文献
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Z-2000偏振塞曼石墨炉原子吸收分光光度计测定地球化学样品中痕量金 总被引：5，自引：2，他引：3
用φ=50%的王水分解样品,聚氨酯泡沫塑料吸附富集金,10g/L硫脲为解脱剂,偏振塞曼石墨炉原子吸收分光光度计测定痕量金。对干燥、灰化、原子化、净化温度和时间,以及载气流量和灯电流强度进行了讨论;对影响金吸附效果的泡塑载体和王水浓度等因素进行了研究。通过实验得到了Z-2000偏振塞曼原子吸收分光光度计最佳石墨炉分析测试条件。方法检出限为0.3ng/g,回收率为95.0%~101.0%,精密度(RSD,n=12)低于8.0%,经国家一级标准物质(GBW07243~GBW07245)分析验证,结果与标准值相符。 相似文献
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堇青石是一种具有较低热膨胀系数、良好抗热震性的矿物材料。天然的堇青石矿物原料很少,因此常常采用人工合成的方法来合成堇青石材料。本文根据近年来合成堇青石的最新研究,论述了堇青石合成方法的研究进展,具体包括高纯氧化物高温固相反应合成法、天然矿物高温固相反应合成法、利用工业废料合成法、利用农业废料合成法、溶胶-凝胶法和低温燃烧合成法。目前工业化生产堇青石大多采用天然矿物高温固相反应法,此法虽有众多优点,但同时也存在许多的不足之处。因此,如何能将其他方法用于工业化生产,将成为合成堇青石今后研究中的一个发展方向。 相似文献