排序方式： 共有35条查询结果，搜索用时 46 毫秒
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高等级公路膨胀土地段路基施工技术 总被引：4，自引：0，他引：4
在分析膨胀土工程特性的基础上，提出了膨胀土路基施工技术要点和基本要求，同时介绍了石（家庄）安（安阳）高速公路邢台段膨胀土地基处理技术措施 相似文献
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分析了干线公路快速化改造提出的背景和快速干线公路的技术要求。在干线公路现状调研的基础上,提出了影响干线公路快速化的主要问题是行车的纵、横向干扰,并从道路断面改造方式,交叉改造方式,平交控制间距等方面提出了干线公路快速化改造可采用的技术解决方案。 相似文献
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Failures caused by the combined actions of fatigue, corrosion and wear are important safety concerns for mooring chains used on floating structures in the oil and gas industry. Prediction of remaining corrosion fatigue life based on surface condition could therefore be a useful tool for the continued safe operation of corroded chains. This paper investigates the use of crack growth modelling for estimating the remaining corrosion fatigue life of mooring chains that exhibit significant pitting corrosion damage. A crack growth modelling approach is used to produce remaining fatigue life estimates for a selection of severely pitted mooring chains. Using fatigue crack growth rate test results for grade R4 high strength mooring chain steel, empirical crack growth laws are presented for free corrosion and cathodic protection conditions at load ratio R = 0.1. Two different methods for establishing equivalent cracks from surface scans of corrosion damage are presented. The mooring chains are proof loaded as part of their manufacturing process. Residual stresses introduced during this process have therefore been determined by finite element analysis and accounted for in the fatigue crack growth predictions. One of the equivalent crack models, accounting for the single dominant corrosion pit, provided quite accurate fatigue life predictions when compared with full scale test results. 相似文献
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南京大厂污水处理厂新建工程(一期)设计规模9万m3/d，出水执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。介绍和分析了大厂污水处理厂工程设计难点，由此确定一期工程处理的工艺方案选择和设计参数，确定了改良型AAO+磁混凝沉淀+反硝化深床滤池+污泥深度浓缩脱水的处理工艺。通过工艺选择和组团式布局解决了用地紧张的难题，利用先进的设备技术保障准Ⅳ出水达标的可行性。对同类标准工程设计有一定的借鉴意义。 相似文献