双排桩支护形式在某复杂深基坑加固中的应用

介绍了绍兴软土地区某深基坑在特殊复杂情况下基坑围护工程,通过采用双排桩支护形式对该基坑进行加固,使得该基坑围护工程顺利完成;基坑监测数据表明其变形较小,从而验证了该基坑采用双排桩支护形式进行加固是成功的,可作为今后该地区类似深基坑围护工程的借鉴.     

双排桩支护结构在软土深基坑中的应用

结合辽河油田勘探局综合办公楼深基坑工程,介绍了双排桩在软土深基坑支护中的应用,根据工程实际情况,经方案对比,采用双排混凝土灌注桩支护基坑,计算双排桩嵌固深度,验算其稳定性,基坑侧壁的变形观测结果表明,双排桩支护效果良好。     

双排工法桩+超前植入钢斜撑支护体系在基坑工程中的应用

文中以某高层建筑为例,对双排工法桩+超前植入钢斜撑新型支护体系在基坑工程中的应用进行深入研究。结果表明,双排工法桩+超前植入钢斜撑新型支护体系能有效保证软土地区深基坑的支护结构施工质量及安全,且减少了对周边建筑物水平及竖向位移的影响,具有明显的社会经济效益。     

悬臂双排桩深基坑支护新体系的研究与应用

深基坑开挖支护是基坑施工的重点,尤其是在建筑密集、地下水位高、厚软土地区的深基坑支护,更是工程界关注的难题.主要讨论以考虑桩土共同工作的悬臂式双排桩支护体系和桩-预应力竖向锚索支护体系为基础的悬臂双排桩深基坑支护新体系,详细分析了支护新体系的受力机理,以及在工程应用中的工作原理.     

双排桩支护结构在基坑支护中的应用研究

以某交通轨道线旁拟建某深基坑支护为例,结合南京地区软土特性且对水平位移要求较为严格的工程,重点采用门架式双排桩支护结构型式,从而避免设置内支撑,方便施工,加快了施工进度。介绍了双排桩及单排桩+锚索支护结构的设计与应用,根据基坑开挖过程中获得的现场监测数据验证了施工方案的合理性,并有效的避免了对紧邻交通轨道线的影响,该工程取得的经验可供同类工程借鉴。     

多种支护形式在大型软土深基坑中的变刚度组合应用

结合具体的大型软土深基坑项目实例,通过了解基坑周边环境情况、地质情况和基坑开挖深度等条件,介绍了放坡、混凝土悬臂排桩、双排桩+锚杆、重力式挡墙以及重力挡墙+双排桩这五种不同刚度的支护形式的组合应用情况。经过设计计算和监测结果的对比分析,表明多种支护形式在大型软土深基坑中的组合应用是安全合理的,可充分发挥各种支护形式的优点,经济社会效益明显。     

软土地区含止水帷幕的板梁式双排桩支护基坑计算研究

依托广州市西湾路地块改造项目一期工程基坑支护项目,结合MIDAS-GTS对软土地区含止水帷幕的板梁式双排桩支护进行了有限元三维数值分析研究。研究表明,基坑开挖对基坑临近区域的地表水平位移有较大的影响,支护结构前、后排桩的水平位移均呈上部大、下部小的分布趋势,随着桩身深度的增加,后排桩的水平位移降幅大于前排桩。结合计算结果及第三方监测数据,该支护形式应用于软土地区可有效提高支护体系的抗侧向变形能力,提高基坑的安全性,具有广泛的应用前景。     

双排桩基坑支护在膨胀土地区的工程应用

以成都望江锦园工程为例,介绍了双排桩支护体系在深基坑支护中的应用,基坑侧壁的变形观测结果表明,双排悬臂桩支护能够有效控制基坑水平位移。     

双排桩支护结构在软土基坑工程中的应用分析

通过汕头软土地区基坑工程的实际情况调查,比较分析双排桩支护结构的特点及应用情况。以一典型基坑工程为背景,分析双排桩支护结构与施工过程相结合对控制基坑工程变形的作用。为进一步了解各种因素对双排桩支护结构的影响,应用Plaxis有限元分析软件对该工程支护结构的受力和变形进行数值分析。结果表明,双排桩结构有一定的刚度,如果与施工方案相结合,能最大程度的控制基坑工程变形。连梁的刚度、排距是影响双排桩结构性能的关键因素,可根据实际工程情况适当选择。     

近接铁路软土深基坑变形控制分析

双排桩围护结构在深基坑中的应用颇为广泛。现针对双排桩在近接铁路软土地区,土质性质为差—极差的基坑工程中的应用展开分析,并利用启明星深基坑软件对临近铁路线路侧的双排桩进行单元计算。当基坑开挖到设计标高时,双排桩的桩顶位移约4.9 mm,当基坑开挖面上的土方施工时,下部双排桩有明显的位移变化,尤其是后排桩的位移达到最大值16.6 mm。故采取双排桩结合"时空效应法"进行基坑开挖,可以有效控制双排桩的侧向变形,甚至可以缓解基坑变形的速率,从而保证了基坑开挖的安全性及稳定性。     

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。