泡沫混凝土处理桥头跳车的机理分析及数值模拟

泡沫混凝土在处理桥头跳车过程中具备一定的工程优越性,文章分析了泡沫混凝土、宕渣及填土路堤对软土地基的静力影响。以福建某公路实例为背景,通过abaqus建立二维有限元模型,对不同材料路堤引起的地基地表沉降及其稳定性进行数值模拟分析,并对比该工程实测结果,为该地区软土路段解决桥头跳车问题提供参考。     

EPS轻质路堤在桥头跳车防治中的应用分析

EPS轻质路堤为桥头跳车病害的防治提供了一种新的处理方法,在软土地基地区具有广泛的应用前景。结合工程实例,介绍了EPS在桥头跳车防治中的应用,并就EPS轻质路堤的设计及施工方法进行了较为详细的说明,为EPS轻质路堤在桥头跳车防治中的应用推广起到借鉴作用。     

轻量土技术在道路路基和桥台填筑中的应用

分析道路路基沉降、桥头跳车的原因及其对道路和行车的影响,论述软土地区道路病害发生的原因,提出EPS填筑路基可以从根本上解决桥路的差异沉降与路堤的残余沉降,达到防止桥头跳车以及台后填土与地基位移对桥台的侧向作用的目的。     

预应力管桩-网复合地基防止桥头跳车的研究

从分析造成高速公路桥头跳车这一现象的原因出发,着重对应用预应力管桩-网复合地基处理技术解决桥头跳车的加固机理和具体工程实践进行了分析和研究,以推广该地基处理技术的广泛应用.     

砂桩复合地基防止桥头跳车的研究

从分析造成高速公路桥头跳车现象的原因出发，对其中有代表性的处理方法进行了探讨，然后提出并着重讨论了应用砂桩复合地基处理桥头跳车的加固机理，以解决高速公路桥台与路堤衔接处的跳车问题。     

软土地基桥梁桥头跳车的危害及防治对策

分析了软土地基桥头跳车的危害，并针对性地提出了桥头跳车的防治对策，指出面对桥头跳车问题，除了在设计上进行处理外，还应完善施工工艺，加强建设监理，才能确保桥涵两端填土和路堤施工质量。     

公路桥头跳车原因分析与防治措施

分析了公路桥头跳车的成因,指出台后软土地基的处理是防治和控制桥头跳车的重要措施,介绍了几种常用的处理桥台与路堤不均匀沉降的方法,阐述了桥头路堤的施工工艺与设计,从而更好地解决公路桥头跳车的问题。     

软土地基桥头跳车的新型解决方案

文章以珠海西部中心城区基础设施建设项目II-1标段工程为依托,通过ABAQUS有限元模型建立了不同路堤的二维平面应变有限元模型。通过观测地基沉降最值以及基底压力来分析不同路堤作用下软土地基的响应情况。结果表明,泡沫混凝土路堤引起的地基沉降较小并且沉降趋势稳定,基底压力相对于传统填土路堤和宕渣路堤也较小,认为能够较好地解决软土地基桥头跳车问题。     

软土地区公路桥头过渡段地基处理技术分析

软土地区的公路路堤易出现大沉降或不均匀沉降等问题,尤其是公路桥头位置,桥头跳车现象较为常见。论文以实际公路工程为例,研究了桥头软土路段、路桥过渡段的地基处理技术。实践表明,通过软土地基处理能有效控制桥头跳车问题,保证沉降量达到标准规定要求。     

高等级公路路堤减轻与复合地基加固的研究

围绕控制路堤沉降这一高等级公路路堤工程中的关键问题 ,对路堤自重减轻和路堤下软土复合地基加固两方面的关键技术进行了研究。在路堤重量减轻技术方面 ,分析了粉煤灰填料路堤重量减轻技术及当前应用与研究状况 ,重点分析了当前新兴的聚苯乙泡沫塑料 EPS超轻质堤料路堤重量减轻技术的应用与研究现状。通过对 EPS进行三轴试验 ,深入分析了 EPS的应力 -应变关系特征 ,同时通过 EPS大型块体载荷试验对分析结论进行了宏观验证 ;正确揭示 EPS内在的力学特征对 EPS路堤工程的沉降变形计算具有重要的意义。通过对宁—通一级公路 K 1 0 2 990断面处路堤沉降数值模拟分析 ,对比了 EPS超轻质块体填料、粉煤灰轻质填料、普通土填料及复合地基加固对路堤沉降影响的差异 ,分析了 EPS路堤造价与复合地基加固路堤造价的差异 ,分析了 EPS在土工领域独特而广泛的应用价值和应用 EPS节省土地资源的长远社会意义。在路堤下软土复合地基加固技术方面 ,分析了当前高等级公路软基加固中常用的复合地基加固技术研究现状 ,特别对路基复合地基加固实际工程中极为关心的沉降问题和临界桩长问题进行了全面深入分析 ,指出了当前复合地基沉降计算和临界桩长确定的研究所存在的问题。分析了半解析元法在地基工程中的应用与研究现状 ,     

污泥制砖存在问题浅析

污泥制砖符合国家的环保政策,但在技术方面还待进一步创新和突破。为此分析了污泥制砖在技术方面、环保方面和社会大众认可方面存在问题及相应的改进措施。     

干旱区绿洲环境下的新疆小城镇建设投资

一、研究区域基本现状新疆地处欧亚大陆腹地,地貌轮廓表现为“三山夹两盆”,山地与平原的面积大致各占50%,镶嵌于戈壁沙漠的绿洲仅有7万平方公里。新疆土地面积166.49万平方公里,占全国总面积的六分之一。气候干旱,荒漠广布,是中国最大的干旱区,是亚洲干旱核心区,也是世界上著名的干旱区之一。水资源短缺,生态极度脆弱。新疆2004年底有1950万人,人均GDP已经超过了1000美元,城镇化进入了快速发展阶段,特别是小城镇的发展速度较快。但新疆特殊的干旱区绿洲环境,使得小城镇的发展存在许多问题。一是城镇规模小而散,基础设施配套差,城镇集散和…     

Levels of manganese in the urine of female farmers in non-polluted regions in Japan

Nearly 1500 urine samples were collected from female farmers in eight regions widely scattered in the islands of Japan in the winter of 1987-1988. The samples were analysed for manganese by wet ashing and flameless atomic absorption spectrophotometry under strict quality control. The values observed after adjustment for a specific gravity of 1.016 were distributed log-normally with a geometric mean of 0.65 microgram/l and a geometric standard deviation of 2.47. There was no effect of aging or any effect of smoking on the urinary manganese concentration. The inter-regional difference may be present but not yet conclusive. As no sex difference was observed in a previous study, it may be possible to deduce that the value may possibly stand for the "background" level of both men and women, either smoking or non-smoking, among the general Japanese population. The observed value is discussed in comparison with values reported in the literature.     

Intersections of inequality in homeownership in Sweden

Abstract

Inequalities relating to ownership of housing have become a major issue de jour in many Western societies. This article examines how the distribution of homeownership in Sweden relates to two factors widely seen as significant to such inequalities, namely parental tenure status and place of birth. We use longitudinal registry data to examine the bearing of these two factors on individual-level tenure progression since the beginning of the 1990s for persons at different stages of their housing careers. We extend existing understandings of Swedish homeownership patterns by demonstrating that inequalities relating to place of birth and parental tenure intersect with one another in ways that substantially advantage certain subgroups while disadvantaging others, and by demonstrating that experiences of entry into homeownership have in recent years been changing in markedly different ways for these different subgroups. Overall, Swedish homeownership inequalities, far from dissipating, appear to be hardening along existing lines.     

Typification of Fires in Buildings in Spain

Although the Dirección de General de Protección Civil (DGPC), an agency of the Spanish government, has been responsible for the collection of data and the statistical analysis of fires since 1985, it has not as yet issued any reports. It is true that a couple of studies have been made, but in neither case did they use a standardized methodology but relied simply on the heterogeneous information provided by the fire brigades which cooperated in the studies. At that time Spanish fire brigades did not have special units for professional fire investigation, nor was the information derived from standardized methodologies suited to research purposes. In addition, information was extremely scarce and basic, focussed only on the fire, the use of the building and personal data of the victims. In this context, the project for a Fire Investigation Unit in the Fire Brigade of Málaga (the sixth largest Spanish province in inhabitants) was set up. Although inspired in the methodologies used in the USA and in the UK, the aim was to create a customized methodology for the first scientific investigation of fires in Spain. Our research was conducted in 2007. Using the methodologies of the USA and the UK, our own methodological approach and the Spanish regulations, we drew up a questionnaire with 110 variables arranged into 6 modules. We studied 96 fires out of the 154 emergency fire calls received in 2007, having omitted some emergency calls for various reasons. Our results revealed that it was necessary to generalize the installation of fire extinguishers in residential buildings, to train the general public in the use of these devices, to promote the use of fire and smoke detectors in residential buildings, to encourage the inspection and control of old electric installations and to monitor the new installations, to generalize the implementation of emergency and evacuation plans and to design new systems and materials for the cabinets where hand-held extinguishers are stored.     

莳花在城市绿化中的应用

目的:花化、香化、彩化已成为城市园林绿化的主要趋势,也是为满足人们对环境要求越来越高的一种心境。方法:选择采用莳花能表现出品种繁多,色彩艳丽等不同的方式,从而能在很大程度上丰富了植物造景的层次感要求。结果:能使其达到美化环境、增添节日气氛、提高绿化品质等方面有着突出的作用。结论:莳花造景对城市的美化可达到立杆见影效果,从而提高城市的形象和品位。     

分光光度法测水中余氯

介绍了用双硫腙分光光度法测定水中余氯的新方法，阐述了其测定试验过程，根据试验结果显示，其结论符合国家标准，表明该方法可用于自来水等样品中余氯含量的测定，结果比较准确。     

日本城市浅层地下空间利用的新成就

本文结合日本川崎市站前广场和神户市哈巴兰德地区的立体化再开发，分析介绍当前日本浅层地下空间开发利用的成就和特点。     

遗传算法在边坡稳定系数计算中的应用

边坡稳定性的关键问题是确定最危险滑动面(潜在最危险滑动面)和边坡的稳定系数。国内外一般是采用先假定边坡滑移模式,然后近似确定最危险滑动面,再求近似的边坡稳定系数的方法来分析边坡的稳定性,但假设的边坡滑移模式难以反映边坡滑移的实际状态。因此本文探索利用遗传算法搜索最危险滑动面,并得到最小稳定系数及对应的最危险滑动面曲线,取得了较好的效果。     

建筑设计创作中的地域文化探索——合肥文博苑创作体会

探索地域文化的发展是民族发展的重要课题。合肥文博苑建立在新城区,作者在其建筑与环境的创作中,既保持合肥地域文化传统,又体现现代文化精神。