马坑山特长公路隧道施工地质超前预报

通过对马坑山特长隧道施工中地质超前预报工作的总结,阐述了地质超前预报的意义,介绍了隧道施工中地质超前预报的工作方法和程序,指出该预报方法将会在高速公路隧道施工中推广应用。     

综合超前地质预报技术在铜盘山隧道中的应用

隧道施工中常遇到一些复杂地质条件,然而单一的物探方法其成果往往存在着多解性和局限性,为了提高预报的可靠性和精确度,提出以地质分析法为基础,物探法为辅助,钻探法为复核的粗-中-细的综合超前地质预报方法。根据这些方法的适用性、局限性以及实际的地质情况将不同的预报方法合理搭配,综合应用,并建立合理的预报工作流程。研究成果已成功应用于铜盘山隧道的超前地质预报工作中,实时掌握隧道地质变化情况,为隧道施工提供依据,保障隧道施工安全。     

提高地震区隧道超前地质预报准确性的措施

隧道超前地质预报工作已是隧道施工中不可缺少的一部分,特别是在不良地质段施工中更应重视这项工作。当前,隧道超前地质预报方法已经从单一的一种预报方法向两种甚至多种方法相结合的综合超前地质预报方法过渡。同时,随着近年来全球地震灾害的频发,针对地震区隧道超前地质预报体系的研究还不成熟,因此,在总结地震区隧道灾害特征及成因的基础上,采用短距离地质分析与长距离物探监测相结合的方法进行超前地质预报工作,再根据预报结果,对影响隧道围岩等级划分的地下水、主要软弱结构面产状、初始应力状态等影响因素进行修正,进而对隧道围岩等级进行动态划分,提高隧道超前预报的准确性,对隧道施工提供更为准确的指导。     

隧道超前地质预报地质综合分析技术

水利水电、铁路、公路工程中隧道(洞)工程规模越来越宏大,加强隧道(洞)施工超前地质预报工作是隧道(洞)施工安全管理的重要环节,是隧道(洞)施工的重要技术保障。以地质分析为主线,多种方法综合运用的超前地质预报体系是提高预报准确率的有效方法,笔者根据近几年来在各大隧道(洞)工程中的预报经验,结合工程实例,就超前地质预报中的地质综合分析技术作简单阐述。     

岩溶隧道施工综合超前地质预报技术研究

结合斗蓬山隧道施工的超前地质预报工作,分析了各种探测技术的适应性,探讨了岩溶地区隧道施工综合超前地质预报技术和方法,可为我国同类工程施工的超前地质预报工作提供有价值的借鉴。     

超前地质预报在榆绥高速米脂1号隧道的应用

结合米脂1号隧道的地质条件,采用地质雷达法进行超前地质预报工作,通过对测试参数的调整及专业检测人员的综合分析,结果表明:地质超前预报在隧道施工中取得了良好的预报效果,确保了隧道的施工安全。     

隧道施工中的地质工作分析

隧道施工中的地质工作既复杂又非常重要,做好隧道施工长短期超前地质预报、隧道围岩类别准确判别、重大地质灾害监测及判断,提出与地质条件匹配的隧道施工方法,是保证隧道施工安全、隧道施工质量及隧道施工快速修建的关键因素之一。分析了目前隧道施工中的地质工作现状、地质灾害及地质工作主要内容,建议建设单位单列隧道施工中的地质工作内容和经费,施工单位应加强隧道施工中的地质工作。     

云南某隧道施工中的地质超前预报方法应用实例分析

地质超前预报是隧道施工过程中必要的工作。长短距离、多方法、地质条件结合,能有效地预测隧道掘进方向上可能存在的断层、破碎带、涌突水、岩溶等不良地质条件对隧道施工的影响,文章介绍结合地质条件,选用TST隧道地震层析成像系统及地质雷达,首先运用TST技术对隧道一段地质条件进行预测分析,得出隧道该段预报结果可以划分为三段,再辅以地质雷达测试分析,精确地质预报结果,再结合开挖验证预报结果。     

综合超前地质预报技术在某岩溶隧道中的应用研究

在我国西南地区岩溶隧道施工过程中极易发生突泥、突水等地质灾害,为了保证隧道施工安全,需要利用超前地质预报技术来查清开挖工作面前方不良地质情况。结合四川某岩溶隧道超前地质预报工作,采用宏观地质分析法、地震波反射法、地质雷达法与超前地质钻孔法相结合的综合超前地质预报技术,探明了隧道掌子面前方溶蚀管道、溶洞及隐伏含水体的空间位置分布情况,提高了地质预报精确度,降低了隧道施工风险。     

TSP203在旧堡隧道检测结果的对比与应用

以张集铁路旧堡隧道1号、2号斜井正洞贯通施工为例,结合隧道现状,利用TSP203进行地质超前预报工作,介绍了隧道1号、2号斜井地质预报的实施措施,并对结果进行对比分析得出相关结论,以期有效指导隧道施工,减少施工风险。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

2005年北京办公物业市场七大趋势

趋势一:CBD区域写字楼集中放量从各区域规划方案上看,CBD区域多数项目在03～04年处于项目的报批手续及拆阶段,预计2005年正式推向市场,因此2005年CBD区域将成为北京市场供应集中的域,区域即将供应的项目有北京财富中心(二期)、金地国际花园、万达广场、SOHO尚都、万通中心、世纪财富中心、怡禾国际中心、光华国际等。除去未知项目,2005CBD写字楼办公面积的供应量为60万平方米左右。中关村区域经过一段时间的集中供后开始逐步放缓,2005年供应的体量相对较大的项目有中关村金融中心、新中关。金街区域可能开盘的项目只有2个:英蓝国际中…     

Developments in immersed tunnelling in Holland

Holland has 22 immersed tunnels (14 road, 5 rail and 3 utilities tunnels). Another three are under construction, and more are foreseen. The tunnels are of the concrete type, i.e., constructed without a steel shell. The paper describes developments in technology and in design philosophy since the first immersed tunnel was completed 52 years ago. These developments include, amongst others: the introduction of the Gina rubber gasket between elements; the division of elements into sections divided by flexible joints; the application (if possible) of longer elements (up to 268 m); the use of precast sections for tunnels that have a small cross-section; the omission of the watertight lining (made possible by cooling the concrete of the walls during the first days after pouring); various foundation methods (e.g., sand flow instead of sand jet system; piled foundations when necessary); the use of the excavation for the open ramps (or the part of the tunnel built on land) as a casting basin for the elements; the changed approach to casting basins now that well pumping is usually forbidden; and the transport of the elements across shallow locations and across the sea. It is emphasized that the current state of immersed tunnel technology is the result of a continuous international exchange of ideas and experiences.     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。