大饭铺至东胜公路地质条件及采空区处置技术分析

以国道109线大饭铺至东胜段公路为例，基于对道路沿线勘察分析，揭示该区水文地质条件，通过对采空区调查，指出在煤层分布范围内，场地不稳定，并提出采空区域处置技术。     

船舶制冷装置故障现象及处理

船舶制冷装置是保证船员正常生活和工作的重要设备。文中介绍了船舶制冷装置制冷剂泄漏、冷凝器冷却水侧脏堵、制冷系统脏堵、融霜装置及压缩机的故障现象及处理过程。     

变压器综合隐患的分析及处理

根据现场测试数据和油样化验结果,结合变压器的实际运行状况,针对牵引变电所110 kV变压器内部存在的综合隐患制定查找和处理的简要程序,并依此程序进行查找和分析,确定隐患的性质和存在的部位,并提出了行之有效的处理措施.     

公路工程中软基鉴别与处治

在公路工程路基施工中,软基是很多项目都面临的问题。采用轻型触探仪鉴别软基,是施工中较方便快捷的方法。在开沟清表的第5个晴天,现场测试地基,当满足cu≥25Kpa时即为软土深度,软基探测每断面间距10米,布置5个测点,或以5m×5m方格网"十"字角点作为触点。     

PLC控制系统常见故障的分布及维护

通过对空调系统的PLC控制系统故障点的分析,得知PLC控制系统常见故障及一般维护方法.这对PLC过程控制系统的系统设计和日常维护将会有所帮助.     

群体性治安事件的构成要件及公安机关预警处置机制

近年来,群体性治安事件,在数量和规模上趋于不断增大的态势,参与的人数较多,组织性也越来越强,行为方式也较为激烈,这就为公安机关的预警和处置带来更大的难度。本文试图对群体性治安事件的构成要件及公安机关的预警处置机制做初略探讨。     

双线客运专线整孔箱梁预制技术

研究目的:为了提前做好客运专线的施工准备,针对双线整孔箱梁施工的特殊性及其重点、难点问题,开展本次研究。研究结果:解决了箱梁施工过程中预制梁场的布置、台座设置、内外模板设计、组装、拆除、混凝土蒸汽养生、预应力张拉工艺、移梁方式及重要设备选型等问题。     

邢昔公路提高沥青路面平整度的方法及措施

路面平整度要达到行车舒适这一要求，需要从路基施工准备阶段就开始重视，所有参加公路建设工程的施工单位都有义不容辞的责任，都必须强化施工管理，完善施工工艺和施工方法，提高施工质量，只有这样，才能从源头上、根本上解决问题，使社会效益和社会质量得到保证。     

Experiments on the survival of six brackish macro-invertebrates from the Baltic Sea after dredged spoil coverage and its implications for the field

Physical disturbance by disposal of dredged materials in estuarine and coastal waters may result in burial of benthic fauna. Survival rates depend on a variety of factors including the type and amount of disposed materials and the lifestyle of the organisms. Laboratory burial experiments using six common macrobenthic invertebrates from a brackish habitat of the western Baltic Sea were performed to test the organisms' escape reaction to dredged material disposal. Experimental lab-results were then extrapolated to a field situation with corresponding bottom topography and covering layer thicknesses at experimental field disposal study sites. Resulted survival rates were then verified by comparison with results of an earlier field study at the same disposal sites.Our experimental design in the lab included the disposal of two types of dredged material (i.e. ‘till’ and ‘sand/till mixture’) and two covering layer depths (i.e. 10–20 cm and 14–40 cm). All three bivalves Arctica islandica (Linnaeus), Macoma balthica (Linnaeus), Mya arenaria (Linnaeus) and the polychaete Nephtys hombergii (Savigny) successfully burrowed to the surface of a 32–41 cm deposited sediment layer of till or sand/till mixture and restored contact with the overlying water. These high escape potentials could partly be explained by the heterogeneous texture of the till and sand/till mixture with ‘voids’. The polychaete Bylgides (Harmothoe) sarsi (Malmgren) successfully burrowed through a 16 cm covering layer whereas the polychaete Lagis koreni (Malmgren) showed almost no escaping reaction. No general differences in escape behaviour after burial were detected between our test species from the brackish habitat and those reported in the literature for the same species in marine environments. However, a size-dependence in mobility of motile polychaetes and M. arenaria was apparent within our study. In comparison to a thick coverage, thin covering layers (i.e. 15–16 cm and 20 cm) increased the chance of the organisms (N. hombergii and M. arenaria) to reach the sediment surface after burial. This was not observed for the other test species. While crawling upward to the new sediment surfaces burrowing velocities of up to 8 cm d^− 1 were observed for the bivalves and up to 20 cm d^− 1 for N. hombergii. Between 17 and 79% of the test organisms showed burrowing activity after experimental burial. The survival rate (defined as the ability to regained contact with the sediment surface) ranged from 0 to 33%, depending on species and on burial depth. The organisms reached the sediment surface by burrowing (polychaetes and bivalves) and/or by extending their siphons to the new sediment surface (bivalves). The extrapolation of laboratory survival rates to the two disposal sites was obtained based on the in situ thicknesses of the dredged spoil layers measured by multi-beam echo sounder. This resulted in total average survival rate estimates for the test species of 45 and 43% for the two disposal sites. The results obtained during the laboratory tests and the following extrapolation to the field were verified by the range of results from a previous field study, using grab sampling shortly before and after a disposal event in June 2001. The effect of dredged material disposal on the tested Baltic Sea benthic macrofauna was assessed by extrapolating the verified laboratory results to the field.     

换填法在公路软土地基处理中的应用研究

换填法是公路工程中一种较为常用的地基浅层处理方法。就其作用原理、适用范围、设计计算、施工工艺及质量检验进行总结，并结合工程实例对素土换填材料的压实特性进行深入研究，可为该方法的应用起到很好的推广作用。