盾构砂性土层所加泡沫剂替代品的工地试验研究     

黄留新  唐汉  盛国新 《江苏地质》2007,31(3):262-267

以上海地铁M8线盾构掘进施工为实例,对掘进过程中所用的进口和国产泡沫剂的性能和效果进行了分析,从中选择有效、经济的泡沫代品,为以后的泡沫法盾构施工提供借鉴和参考。  相似文献   

CG型全套管冲抓成孔设备及施工工艺          下载免费PDF全文

宋志彬冯起赠  王年友张金昌 《探矿工程》2007,34(9):48-52

简述了国家重点新产品“CG型全套管冲抓成孔设备”的研发历程,以及设备的组成、特点和参数;分析了全套管灌注桩、咬合桩、置换桩的施工工艺及特点;总结了该设备的应用实例和发展前景。  相似文献   

关于锚索造孔精度问题的探讨          下载免费PDF全文

张俊礼  李超  刘晋龙 《探矿工程》2006,33(7):46-48,.51

主要探讨水平锚孔造孔偏斜的机理及影响锚索造孔精度的原因，从理论上建立控偏、纠偏的数学模型以及从施工工艺及机具、钻进参数选择、工艺技术等方面探讨提高锚索造孔精度的问题。  相似文献   

定（导）向钻进的轨迹设计   总被引：12，自引：1，他引：11  

蒋国盛  张家铭 《地质与勘探》2000,36(2):13-15

主要介绍定 (导 )向钻进非开挖地下管线施工的钻孔轨迹设计方法。  相似文献   

盾构机姿态的人工测量原理     

黄小斌  区兆铭  张永超  蒋样明 《测绘科学》2011,36(3):25-28

本文针对地铁隧道盾构法施工中盾构机的导向方法,提出盾构机姿态的人工测量原理,通过在Excel中编辑的盾构掘进姿态解算程序来计算盾构机的实时掘进姿态,及时指导盾构机纠偏,确保盾构机按照设计的线路进行掘进.  相似文献   

绳索取心冲击回转钻具组合设计及应用试验          下载免费PDF全文

廖国平  刘国经  李胜达  谢龙诚  高红 《探矿工程》2011,38(4):31-35

绳索取心冲击回转钻具是将绳索取心和冲击回转两种钻进工艺的优势进行叠加设计出的新钻具,该钻具对提高钻探生产效率和施工质量有显著的效果。通过设计及应用试验,发现了内管总成的＂漂浮现象＂及原钻具内管总成的＂减振效应＂对两种工艺组合应用影响的关键技术难题,并采取了有效的解决方法,为今后该技术的发展提供了参考。  相似文献   

Virtual nature,violent accumulation: The ‘spectacular failure’ of carbon offsetting at a Ugandan National Park     

《Geoforum》2014

In East Africa, financially strained governments increasingly experiment with voluntary, market-based carbon offset schemes for enhancing the public management of protected areas. Often, conservationists and governments portray these as ‘triple-win’ solutions for climate change mitigation, biodiversity preservation, and local socioeconomic development. Examining such rhetoric, this paper analyses the rise and decline of an integrated carbon offset and conservation initiative at Mount Elgon National Park in eastern Uganda, involving a partnership between the Uganda Wildlife Authority (UWA) and a Dutch NGO, Face the Future. In doing so, the paper reveals the ways in which the uncompensated dispossession of local residents was a necessary precondition for the project’s implementation. Although external auditors expected the project to sequester 3.73 million tons of carbon dioxide equivalent (tCO₂e) between 1994 and 2034, conflicts forced the scheme to cease reforestation in 2003. Noting this rapid decline, we problematize the ways in which Face the Future and other carbon market intermediaries represented their activities via project documents and websites, obscuring the violence that was necessary for the project’s implementation. In so doing, we argue that the maintenance of a ‘triple win’ spectacle is itself integral to the management of carbon sequestration projects, as it provides consumers with a form of ‘ethical’ use value, and greatly enhances the capacity of carbon market brokers to accumulate exchange value by attracting ‘green’ investors. Consequently, what we term a ‘spectacular failure’ manifests in at least two ways: first, in the unravelling of the heavily mediatized spectacle of harmonious, profitable conservation, and, second, in the deleterious nature of the consequences that accrue to local communities and ecosystems alike.  相似文献   

Imageries of the contested concepts “land grabbing” and “land transactions”: Implications for biofuels investments in Ghana     

《Geoforum》2014

In Ghana, the contested concepts of “land grabbing” and “land transaction” are strategically applied by proponents of critical and win–win discourses respectively to describe outcomes of land deals. Using case study methods and discourse analysis, this paper explores four cases of biofuels investments in Ghana and the implications of the choice of concepts used to represent them. Proponents of the critical discourse use the “land grabbing” concept to invoke imageries of “illegality”, “theft” and “food insecurity” when describing land deals. Consequently, some biofuels investments have been hampered in their potential to generate profit and local employment. The biofuel investors in this study, whose projects have been labeled “land grabbing”, therefore switched to food production to downplay public scepticism. Proponents of the win–win discourse portray biofuels investments as “pro-poor” projects and use the “land transaction” concept to pre-empt possible public criticisms in the media and elsewhere. Such representations of these biofuels investments are therefore mainly intended to pre-empt criticisms or attract public praise. Some projects with potentially promising outcomes have thus been terminated, while others with problematic outcomes have continued to be promoted. In contexts characterized by weak land regulations and ambivalence towards large-scale agriculture, the trajectory and outcomes of biofuels investments are often influenced by land deal representations drawn from global discourses and how they interact with pre-existing local discourses.  相似文献   

全液压车装钻机在集束式潜孔锤反井施工中的应用   总被引：2，自引：1，他引：1       下载免费PDF全文

冯起赠  秦如雷  许本冲  和国磊  赵建勃 《探矿工程》2014,41(6):23-26

采用SDC1500型全液压钻机配套新型集束式反井气动锤施工工艺,成功解决了传统的反井钻机效率低下的问题。结合内蒙古自治区准格尔煤田黄玉川煤矿大直径排水井工程,对该施工工艺方法进行了总结。  相似文献   

某电厂水库岸边取水工程施工实践          下载免费PDF全文

李建斌  刘国谋  赵存宝  李丽  袁慧敏 《探矿工程》2014,41(2):74-77,81

为满足某电厂供水需求,需在某水库进行岸边取水工程（含取水竖井、引水隧道、引水明渠3部分）施工。通过短段掘砌逆作工艺,井筒壁溶洞导水并将导出的水作为水源的一部分,实现了井筒干封底,顺利完成井筒施工;采用顶管技术＋管顶注浆技术在破碎岩体、涌水量较大地层成功完成引水隧道施工;通过岩塞爆破成功实现引水隧道和水库的连接;通过船载冲击成槽技术,实现了引水明渠的施工。  相似文献