关于基坑工程的几点思考

文中讨论了基坑围护设计中土压力的合理选用,坑外卸土和坑中坑对基坑围护稳定和变形的影响,基坑围护的主要矛盾和围护型式的合理选用,土钉支护的临界高度和复合土钉支护有关问题,基坑工程设计与施工组织设计,基坑工程环境效应与按变形控制设计,关于基坑工程规范和基坑工程设计计算机软件等方面的问题。     

组合型钢板桩在南京某基坑工程中的应用

组合型钢板桩因其安全、环保、经济以及快捷的优点作为一种新型的基坑支护方式近年来得到广泛的应用。文章以南京某基坑工程为例,对组合型钢板桩在基坑工程中的应用进行了对比分析,进一步验证其在基坑工程可行性,为类似工程设计、施工提供有益的参考。     

高层建筑基坑支护工程结构设计与施工

本文结合工程实例和工程地质情况,详细介绍了建筑基坑工程支护施工方案的比选和基坑支护工程设计,并在施工技术方案分析的基础上,对其SMW工法连续墙及整个基坑施工技术进行了详细阐述,对施工监测进行了评价。     

深基坑工程支护结构设计及施工

结合某深基坑工程实践,通过原位测试和室内土工试验,得到基坑设计参数,经过计算后确定基坑支护设计方案,并对基坑工程的施工和监测要点进行了分析,可为以后的工程设计提供参考.     

深基坑工程事故问题初探

在对大量基坑工程事故调查、分析的基础上，根据深基坑工程特点，从基坑工程地质资料及结论不准确、基坑支护方案选择不当、设计计算或验算不准确等方面总结了常见的引发工程事故的各种因素，给出了应注重勘查、设计及施工监测等内容的防范措施，以期能对工程设计和施工有所帮助。     

复合支护方案在城市建筑密集区域基坑支护中的应用

对某工程基坑支护工程设计与施工进行分析,结合工程特点,详细介绍了排桩支护、预应力锚索及双管旋喷桩止水帷幕相结合的复合支护方案在城市建筑密集区域基坑支护中的应用。     

某人防工程基坑监测分析

结合某人防工程基坑支护结构的现场监测,介绍了基坑支护及基坑监测方案,并对监测数据进行了整理分析,该工程基坑支护采用复合土钉墙形式保证了基坑支护工程的安全。     

某人防工程基坑监测分析

结合淮安市某人防工程基坑支护结构的现场监测,介绍了基坑支护及基坑监测方案,并对监测数据进行了整理分析,指出该工程基坑支护采用复合土钉墙形式保证了基坑支护工程的安全,基坑开挖施工的安全和周边环境的安全。     

软土基坑的ANSYS建模及有限元分析

结合实际的软土基坑工程,采用ANSYS二次开发程序对软土基坑支护工程进行模拟,分析和研究软土基坑的应力应变情况,并将模拟成果与监测数据进行比较,二者吻合情况良好,表明数值模拟分析成果合理,对同类工程设计及施工具有一定的指导意义。     

基坑工程若干基本问题的讨论—基坑开挖与支护研讨会综述

本文概要地综述了基坑开挖与支护研讨会上各位专家的讨论发言及交流资料，介绍了与会专家们对目前基坑工程设计及施工中存在的主要问题的认识，并强调了基坑工程中经验的重要性及监测工作的必要性。     

市政道排工程冬季施工中的一些技巧

介绍了太原市冬期施工的时间,简述了冬期施工对材料的要求,从混凝土工程、管线土方开挖回填、钢筋工程、砌体工程等方面,归纳总结了冬期施工中应注意的问题,以确保工程的质量。     

Cost overruns in public projects

The effects of cost overruns are not confined to the construction industry but are reflected in the state of the overall economy of a country. This is particularly so in Turkey, where construction investments account for almost half of all investments. A large number of Turkish public agencies and contractors were surveyed to identify the causes of such cost overruns in public projects undertaken in the decade 1970–1980. The results indicate that inflationary pressures, increases in material prices and workmen's wages, difficulties in obtaining materials at current official prices, construction delays and errors in first estimates were the most important sources for cost overruns.     

Underground hydropower projects in Sweden

Since the first hydropower plant in Sweden began operating in 1882, nearly a thousand such plants have been built. Today, primarily because of favorable geological conditions, 60% of Sweden's hydropower is produced in underground stations. The authors describe the Swedish system of underground hydropower station design and construction, and provide examples of hydropower plants built in Sweden and other countries by Swedish companies.     

Evaluation of Chinese projects and comparison with Norwegian projects

Project work in developing and emerging economies is complicated and unpredictable. It would be of great help to equip project managers with an easily applicable tool to assess whether the project is on the right track or not. A Project Evaluation Scheme (PEVS) has earlier been used on Norwegian projects. Data from 89 Chinese projects has been collected using the scheme. This article analyses the Chinese data and compares them to the Norwegian findings. The Chinese projects are scoring higher in all areas investigated, except on informal contacts. Particularly high were goal setting, overall planning and control execution. The Chinese projects achieve their goals and are regarded as a success by all participants. They should improve in project closeout work. The article discusses the reasons for differences between Chinese and Norwegian projects, ranging from differences in perception regarding the questionnaire, to the possibility that Chinese projects in fact are better. The qualities of activity execution are found to be the most important factor in predicting project success. PEVS is proven to be applicable to Chinese projects, yet further customisation is needed.     

建筑工程的三控制

从建筑工程项目质量、进度、造价控制的意义出发,对其质量控制、进度控制及工程造价控制的手段及措施进行了分析总结,通过采取有效的措施,达到了工程项目预期的控制目标。     

Cost modelling in underpinning projects

Large refurbishment projects are characterized by highly varied costs from one project to another. In Finnish underpinning, only retrospective analysis of costs has been available for the owner’s decision process. In order to develop tools for pre‐tender cost estimating and for comparison of different design solutions and evaluation of tenders of the underpinning project, two different cost models have been developed for research. In both models developed, the minimum data required is the pile length. In the more detailed model, the assessment is based on the design solution, including known pile types and the load transfer classification. Both models are easy to use, and the percentage of explained variance is fairly good in the more detailed model.     

Wireless networking in tunnelling projects

Emerging collaborative technologies and working methods often require tremendous engineering and organisational efforts for successful implementation of information and communication technologies (ICTs). According to a research conducted in Turkish construction industry, most of the problems that occur during the construction phase are due to lack of co-operation and communication between designers and contractors and lack of prompt expert decisions during on-site engineering. Similar to any major construction project, tunnelling project’s success is highly dependent on collaborative team work where communication and information exchange take place between project members. Distributed collaborative teamwork, as the case in most of the large scale construction projects as well as tunnelling projects, empowered by state of the art information and communication technology, promises more efficient work processes, reduced travelling needs, and increased opportunities for project communication. Following the fast development of mobile computing in recent years, many sectors have adopted mobile devices and wireless technologies enabling real-time information transfer thereby improving business processes. For some years, the feasibility of implementing wireless solutions to construction sites has been researched. Potentially, mobile and wireless technologies enable construction staff to be more flexible in terms of location and time. For better use of mobile collaboration in construction projects, mobile technologies and construction sector have to be examined in some detail to implant the most suitable technology for real-time information access and improved collaboration of distributed teams in construction. However, case studies in construction are very limited in number and scope. This paper discusses and proposes an implementation scenario of wireless networking in Marmaray; a multi-site tunnelling project in Istanbul. Benefits, possible problems and cost assessments are discussed.     

Future tunnelling projects in Iceland

More than 300 km of hydro tunnels and 80–90 km of road tunnels could be excavated in Iceland before the year 2050. In order to complete this task, an average of 6–7 km of tunnel per year would have to driven. This volume of tunnelling is estimated to cost more than $US1 billion, which could be divided as follows: a) about 100 km of 3.5-m-wide diversion hydro tunnels (unsupported), for a total of $90 million; b) approx. 100 km of 5-m-wide hydro tunnels (supported), for a total of $210 million; c) about 100 km of 7.6-m-wide hydro tunnels (supported), for a total of $380 million; and d) approx. 85 km of road tunnels with 25 m² cross-section, for a total of $435 million.     

Tunnelling projects in Southern Africa

Until some thirty years ago tunnelling in southern Africa for civil engineering purposes had been on a relatively small scale and of a sporadic nature. The first major tunnel to be built in the region was the 82 km long Orange-Fish Tunnel. Since 1970 more than 175 tunnels with an aggregate length of just over 400 km have been built. Much of the first phase of the Lesotho Highlands Water Project, which will have more than 100 km of tunnels, is about to be completed. The last thirty years represent the busiest period of tunnelling by civil engineers that southern Africa has ever known. The paper starts by summarising the early history of tunnelling in the region, and goes onto describe recent and current tunnelling projects. It also gives an indication of the possible demand for tunnels in the future.