首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 328 毫秒
1.
隧道工程施工中,由于不良地质现象、支护参数或形式不当、支护时间滞后、施工质量缺陷等原因,塌方是时有发生的。处理塌方可以引进新奥法思路,使塌方的处理达到最佳效果。文章详细介绍了新奥法思路处理塌方在不良地质隧道工程中的成功应用,并根据实际情况归纳出山东威海市昆明路隧道塌方处理技术措施。  相似文献   

2.
双峰寺隧道施工过程中洞内出现塌方的处理方案和技术措施,主要有对塌方范围进行初期支护采用工字钢架、安放斜支撑、回填枕木、注浆等措施,安全顺利地通过塌方段。  相似文献   

3.
陈祖祥 《价值工程》2015,(18):107-109
随着铁路、公路建设的迅速发展,越来越多的隧道穿越于地质条件复杂地区,在各种不利因素的共同影响作下,隧道出现塌方现象日趋增加,给隧道的施工安全、质量及进度带来极大影响。所以我们在采取措施努力避免隧道塌方的同时,也必须提高隧道塌方后的处理技术及措施方面的应对能力,使已发生事故造成的各方面影响降至最低。笔者基于新关坡隧道塌方处理实例,对于隧道产生塌方的原因进行分析,制定有效的隧道塌方处理措施,与同行进行探讨,共同提高。  相似文献   

4.
张丽  陈群  张宇骏  华宏亮 《价值工程》2012,31(25):123-124
云南省公路隧道相当部分需要穿越滑坡、断裂破碎带等不良地质,隧道塌方情况时有发生,塌方处治加大了工程资金投入,影响工期,同时对施工人员的生命安全也构成了巨大威胁。隧道塌方的原因较为复杂,只有掌握工程地质条件,充分了解设计意图,严格控制施工方法、施工程序,才能有效地规避隧道塌方的发生。  相似文献   

5.
《价值工程》2017,(31):119-120
以岳家沟隧道塌方为研究对象,从不良地质、地下水及应力分析等方面阐述了岳家沟隧道塌方的原因,制定了详细的处理方案,可为类似隧道塌方事故提供参考。  相似文献   

6.
隧道塌方已经成为隧道施工中常见的问题。文章从分析隧道塌方的原因出发,在此基础上论述隧道塌方处理的方法。  相似文献   

7.
在公路隧道中,塌方是常见事故,直接影响公路的隧道作业速度和质量。为保障隧道施工顺利,塌方处理有很大必要。本文以公路隧道的塌方原因作为研究点,叙述治理思路,讨论塌方预防方案,旨在为我国的工程行业发展提供帮助。  相似文献   

8.
结合新响沙湾隧道工程实例,通过对隧道膨胀土洞段塌方的研究,分析隧道塌方原因,详细阐述了塌方处理方案、施工注意要点,对同类围岩隧道施工具有一定的借鉴意义.  相似文献   

9.
张忠义 《价值工程》2014,(12):133-134
本文以大独山隧道平导溶蚀破碎岩体塌方冒顶处理为例,介绍了塌方原因及处理方案,为今后同类型的隧道塌方冒顶处理的施工技术提供指导依据。  相似文献   

10.
官地水电站对外交通公路改造工程磨盘山隧道出口段施工期间出现了塌方,塌方规模和范围均较大,文中详细介绍了处理塌方时采取的措施,并由塌方处理的过程总结出“小塌要抢,大塌要等”的施工原则,同时本文详细介绍了塌方处理的方案和处理的全过程,可为类似工程提供参考.  相似文献   

11.
Slumdog cities: rethinking subaltern urbanism   总被引:5,自引:0,他引:5  
This article is an intervention in the epistemologies and methodologies of urban studies. It seeks to understand and transform the ways in which the cities of the global South are studied and represented in urban research, and to some extent in popular discourse. As such, the article is primarily concerned with a formation of ideas - "subaltern urbanism" - which undertakes the theorization of the megacity and its subaltern spaces and subaltern classes. Of these, the ubiquitous ‘slum’ is the most prominent. Writing against apocalyptic and dystopian narratives of the slum, subaltern urbanism provides accounts of the slum as a terrain of habitation, livelihood, self-organization and politics. This is a vital and even radical challenge to dominant narratives of the megacity. However, this article is concerned with the limits of and alternatives to subaltern urbanism. It thus highlights emergent analytical strategies, utilizing theoretical categories that transcend the familiar metonyms of underdevelopment such as the megacity, the slum, mass politics and the habitus of the dispossessed. Instead, four categories are discussed — peripheries, urban informality, zones of exception and gray spaces. Informed by the urbanism of the global South, these categories break with ontological and topological understandings of subaltern subjects and subaltern spaces.  相似文献   

12.
张睿 《价值工程》2012,31(14):90-91
随着社会的进步和企业的发展,企业的高层都认识到,人力资源是企业最为关键的资本,是企业介入市场竞争之根本,人力资源的管理与开发是企业成功的关键。企业也日益深刻的体会到培养核心竞争力是制胜的法宝,而这种竞争力无疑与人力资源的正确开发和合理利用有着密切的联系。本文通过对企业人力资源开发与管理存在的问题与原因的分析,提出了相应的对策和措施。企业人力资源开发与管理是研究对企业各类人员的录用、开发、维持和使用进行计划、组织、指导和控制的一项系统工程。  相似文献   

13.
Despite the establishment of high-tech multinational enterprises (MNEs) in Ireland since the late 1950s, the country did not succeed in closing the technological gap with most of its EU counterparts. The weak National System of Innovation (NSI), and in particular low business and government R&D levels, combined with a lack of research and technology linkages between MNEs and indigenous firms, explain these poor results. However, the Shannon region in the West of the country presents some specific institutional characteristics that could theoretically make the region a strong technological enclave. The various actors in the region - i.e. the administrative, financial, political and research institutions, as well as the business organizations - have indeed infused a new type of economic development. After a brief review of the available concepts and models articulated around these actors and their interrelationships, the paper analyses whether the Shannon region, taken as an illustrative example, mirrors a specific economic and technological localized setting. The study is based on a survey of indigenous and foreign firms.  相似文献   

14.
事业单位人事纠纷与劳动纠纷自成立之日起便以有之。工作中存在与发生的矛盾、分歧与争议无时不在。上级与下级之间、员工与领导之间、人与机构之间、单位与人事机构之间存在与发生的纠纷、矛盾基本上通过党组织、行政命令、政策、甚至个人权利威望与影响力来解决。这些人事矛盾基本上在内部消化,几乎从未没有公开。而到了21世纪的今天,由于政治与民主法制进程加快,以及人事制度的悄然进行,这种矛盾日益公开。那么化解这种矛盾究竟是适用劳动仲裁还是人事仲裁仍然存在很多问题。文中对事业单位人事纠纷和劳动纠纷的危害及产生的问题根源进行较为深刻的剖析,针对事业单位的性质以及与企业的区别,提出了事业单位所适用的相关法律及相关建议。  相似文献   

15.
This paper provides a non-systematic review of the progress of forecasting in social settings. It is aimed at someone outside the field of forecasting who wants to understand and appreciate the results of the M4 Competition, and forms a survey paper regarding the state of the art of this discipline. It discusses the recorded improvements in forecast accuracy over time, the need to capture forecast uncertainty, and things that can go wrong with predictions. Subsequently, the review classifies the knowledge achieved over recent years into (i) what we know, (ii) what we are not sure about, and (iii) what we don’t knowIn the first two areas, we explore the difference between explanation and prediction, the existence of an optimal model, the performance of machine learning methods on time series forecasting tasks, the difficulties of predicting non-stable environments, the performance of judgment, and the value added by exogenous variables. The article concludes with the importance of (thin and) fat tails, the challenges and advances in causal inference, and the role of luck.  相似文献   

16.
This paper examines the diffusion of Information Communication Technology (ICT) into firms in Scotland and northern England. Data concerning the adoption of micro-computers, e-mail, the Internet, ISDN, in-house website, and the automation of business functions is analysed by industry, firm size, firm age, rate of growth, export involvement, and innovation activity. The results from a sample of 1347 firms found an overall increase in the adoption of ICT in firms between 1998 and 2001. The increase is led by older and larger firms in comparison to younger and smaller firms. In addition, the diffusion of the automation of business functions was found to be sequential, from generic to specific applications. Further increases in the diffusion of ICT are likely to come from upgrading existing equipment and increases in the range of business functions that can be automated. Finally, although use of the Internet and web-based trading has increased in the sample firms, this has not replaced traditional marketing and sales. The results support the view that more firms are taking up the challenge of using ICT in-house, with older and larger firms leading the way ahead of younger and smaller firms.  相似文献   

17.
The steady growth of R&;D costs and the increasingly widespread dissemination of information and communication technology over the past decade have resulted in the affirmation of the paradigm of open innovation, which consists in the continual expansion of access to sources of technological innovation outside the firm itself. Industrial companies are, in fact, turning more frequently to collaboration with university departments and other public and private research centers, and there is a notable increase in agreements regarding technological cooperation and the exchange of know-how between companies. In addition, recourse to highly specialized small research companies is on the rise. This is common, for example in the pharmaceutical sector and, more generally, in the area of biotechnological research. Furthermore, we are witnessing the development of the new role of innovation broker. These factors alter the traditional profile of company R&;D structures, within which the role of researchers and technologists often changes. In particular, matrix and network organizational models are on the increase, and the professional figures of ‘integrators of knowledge and expertise’ (T-men) are assuming major importance at the expense of traditional scientists. As a consequence, the model for training and managing scientific personnel tends to change. This model, as it moves away from the prevailing pattern adopted by firms in Anglophone countries, is continually drawing closer, even from a cultural standpoint, to the R&;D management approach found in the Japanese and German companies. The aim of this article is to investigate how the adoption of open innovation has changed the organizational structures of R&;D and altered the methods used in managing its personnel. The results of the study are based on the analysis of four case studies of Italian multinational firms operating in the pharmaceutical, food, specialty chemical, and aerospace industries.  相似文献   

18.
《施工总承包企业特级资质标准》即将实施,该标准突出了企业资质能力、人员素质和科技进步等方面的要求,对国内建筑企业发展起到引领战略转型和推动科技进步的积极作用。然而其科学性、规范性和标准性还有待商榷和探讨,其在营业税、年授信额度、财务负责人、注册一级建造师、甲级设计人才、科技等方面的要求存在缺陷。但不论该标准是与非,其实施体现了国家对建筑施工企业发展的新要求,指明了新方向,要求企业必须实现战略转型,在成本领先、差异化和专业化上下苦功,创造独特的、有利的企业经营管理模式,建立企业长期竞争优势,以获得持续发展的"令牌"。笔者就此进行深入思考并提出见解。  相似文献   

19.
This paper describes the M5 “Uncertainty” competition, the second of two parallel challenges of the latest M competition, aiming to advance the theory and practice of forecasting. The particular objective of the M5 “Uncertainty” competition was to accurately forecast the uncertainty distributions of the realized values of 42,840 time series that represent the hierarchical unit sales of the largest retail company in the world by revenue, Walmart. To do so, the competition required the prediction of nine different quantiles (0.005, 0.025, 0.165, 0.250, 0.500, 0.750, 0.835, 0.975, and 0.995), that can sufficiently describe the complete distributions of future sales. The paper provides details on the implementation and execution of the M5 “Uncertainty” competition, presents its results and the top-performing methods, and summarizes its major findings and conclusions. Finally, it discusses the implications of its findings and suggests directions for future research.  相似文献   

20.
李红新 《价值工程》2012,31(31):176-178
随着经济全球化和信息技术与信息产业迅速发展,电子商务将成为今后信息交流的热点,成为各国争先发展,各个产业部门最为关注的领域。通过互联网和电商行业十多年的共同努力,我们看到的是电子商务的日渐成熟与发展态势。我们只有具备战略性和前瞻性的眼光,适应全球经济一体化的趋势,努力发展适合我国国情的电子商务,才能立于不败之地。本文探讨了我国电子商务发展趋势的四个方面,引入数字流量与现实相结合,提高转化率,提高网站优质服务;网络诚信建立促进电子商务快速发展、物流配送完善,保障电子商务发展;移动商务发展带动电子商务发展。随着电子商务这些趋势建立完善,我们相信未来电子商务市场将逐渐走向稳健和成熟。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号