排序方式: 共有61条查询结果,搜索用时 15 毫秒
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查干淖尔煤矿斜井兼有大坡度、大埋深,无水泥岩、砂质泥岩地层,地层具有较好自稳性。与传统钻爆法、冻结法相比,从自身结构特点、地质适应性、施工安全性、衬砌质量、施工速度等方面进行敞口式盾构的可行性分析;从盾壳支护、开挖及保护、出碴及物料运输、盾构防卡盾、防栽头措施、管片拼装及壁后注浆等关键问题进行适应性设计探讨。 相似文献
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Complex policy frameworks guide the management of the Great Barrier Reef (GBR) at multiple decision-making levels. Mounting pressure on its outstanding universal value suggests that further improvements in governance are required. There has been little examination of the role of policy actors in addressing complex governance challenges in large scale marine protected areas (LSMPAs) involving multi-layered governance conflicts across diverse contexts. Framed by street level bureaucracy, pragmatic planning theory, and lessons from MPA governance, this paper examines how policy actors improvised and collaborated to advance outcomes in the GBR LSMPA. We assessed practice-focused oral histories with experienced policy actors who negotiated agreements and achieved policy outcomes in the GBR between 1985 and 2016. These policy actors were skilled improvisers, alternating between roles as democratisers, mediators, and negotiators. They used collaboration and facilitative leadership to advance policy in the face of governance problems. This enabled them to adapt policy across multi-level decision systems, address power and information imbalances, and generally deal with conflict and uncertainty. A deeper understanding of improvisation will assist governments and others to address complex challenges in LSMPAs. 相似文献
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王昆 《筑路机械与施工机械化》2005,22(2):38-39,47
针对蚌埠朝阳路淮河公路特大桥主墩基础桩基工程施工技术难点,从施工平台的选择、钻孔灌注桩施工工艺流程、质量控制及检验等方面介绍了嵌岩灌注桩施工技术要点和质量检验手段、方法. 相似文献
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该文以大跨度钢管混凝土桁架拱桥为背景分析了时变对拱肋结构力学状态的影响,结果表明时变对拱肋内力影响较小,而对应力影响很大,设计时必须考虑时变带来的应力重分布效应。 相似文献
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柳沟河大桥位于黄土地区,覆盖层土质疏松而且具有湿陷性,压缩量大,此外,该地区气候干燥,冬季严寒,在桩基施工中遇到不少困难。文章结合该桥的施工实践,介绍黄土地区桥梁桩基施工过程中的测量桩标埋设、成孔方法及砼材料选用等施工方案,为类似工程施工提供参考。 相似文献
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基于NAPA大宽深比船舶总纵强度计算方法及分析 总被引:1,自引:0,他引:1
以大宽深比船舶为研究对象,根据梁理论基本原理,以某近海油船为实例,提出一套基于船舶设计软件NAPA进行总纵强度计算方法和步骤。并与传统手工计算结果相比较,结果表明该方法比传统方法具有较高的计算精度和效率。 相似文献
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