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在基坑施工过程中,基坑围护结构设计的稳定安全系数是不可测的,因此,《建筑基坑支护技术规程》（JGJ120－99）和《建筑基坑工程监测技术规范》（GB50497－2009）要求不同安全等级基坑的施工过程中有不同类型的监测项目,并给予相应的安全预警值。由于施工监测项目数据的不同步性,为避免对施工过程安全状态的“突发性”以及应对不同安全状态措施的需要,提出了安全预警分级方法。根据监测项目的实测数据,采用模糊数学方法定义了广义稳定系数评估施工过程的安全状态,并给出了广义稳定系数的安全下限。基于实际工程的监测数据,分析了不同监测项目广义稳定系数的变化过程,指出了安全控制的重点监测内容。 相似文献
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可施工性(Constructability)研究,根据美国施工行业协会的定义,是指在项目规划、设计、采购及工厂操作等方面,应充分使用一些以往通过施工工作获得的知识和经验,从而有效降低项目成本、加快项目进度,进而确保项目整体目标的实现。而可施工性审查,是指通过各个专家一起对整个项目的规划、设计、采购及工厂操作等诸多方面进行充分的研究分析,探讨出一些改进设计的方案,从而降低整个项目成本,或者使设计最终方案更加方便最终用户的过程。研究表明,如能在项目的早期阶段就将一些施工经验和方法融入到项目规划和设计中,将对项目成本节约产生巨大的影响。也就是说,项目越早建立和实施可施工性计划,越早开展可施工性审查,项目在以后获得的潜在效益也越大。因此应把针对设计开展的可施工性审查工作作为设计阶段的一项重点工作,这项工作对节约项目成本,保证项目进度的作用十分巨大。现把我公司在后化项目上取得的一些可施工性审查的经验介绍给大家,希望能对大家开展类似工作有所帮助。 相似文献
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来自中国房产信息集团的数据显示,2014年7月1日-7月8日,全国土地市场土地成交力度趋弱,共成交经营性地块607幅,同比下降31%;成交总建面积1523万平方米,同比下降35%;成交总金额为261亿元,同比下降55%。成交金额及成交量的走低主要是因为政府推地依然较为缓慢,房企拿地积极性也不高,流标率的反弹显示的却是政府推地意愿和企业拿地意愿正在出现越来越大的分歧。 相似文献
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西安中煤建筑工程公司的质量方针是“以质量求生存,向管理要效益,优质工程真诚服务,用户满意是我们永恒的追求。通过近十年的创业与发展,证明我们的定向、定位是正确的,主要得益于与国际接轨的建筑企业现代化生产方式“项目法施工”。为此,笔者就我公司推行“项目法施工”的体会总结如下。 ①“项目法施工”是施工组织管理体制的创新。“项目法施工”是把过去传统的企业成建制地组织项目施工生产转变为以项目为主体动态配置生产要素施工生产的组织管理方式。企业管理的基点落到项目层次,是以合同为纽带的市场运行方式,根据合… 相似文献
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基于大数据、云计算等现代信息技术与理念,结合地质调查工作实际,系统论述了建设地质大数据体系的总体框架和实现的技术途径。提出了地质大数据体系建设的5项任务组成: 建设地质数据采集体系,推进地质数据快速规范采集; 建设地质大数据汇聚体系,实现地质数据快速有效汇聚; 建设地质数据与信息服务产品体系,丰富地质数据与信息社会化服务产品; 建设地质数据与信息服务体系,推进地质数据与信息协同服务; 建设地质大数据支撑平台(“地质云”),提升地质数据与信息服务的能力和水平。论述了5项任务的主要内容及其面临的关键技术问题,并简要提出了建设地质大数据体系对其他相关工作的影响和要求。 相似文献
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青藏高原是我国乃至世界高海拔多年冻土区的典型代表。伴随着青藏铁路的建成通车,西藏自治区迎来了新一轮经济发展,迫切需要新建高速公路、输变电线路、输油气管道工程等。这些拟建工程与已建的青藏公路、青藏铁路、格拉输油管道、兰西拉光缆等工程均聚集于宽度不足10km范围内的青藏工程走廊。在这狭长的冻土工程走廊内,已修建或拟建的各种冻土构筑物相互影响,多因素耦合叠加,加速区域内的冻土退化,而冻土融化必将影响到工程的稳定性和生态环境退化。再加上全球气候变化的影响,其变化程度更加剧烈。面对国家需求,国家重点基础研究发展项目"青藏高原重大冻土工程的基础研究"于2012年4月正式启动。该项目旨在揭示气候变化与人类工程活动加剧背景下冻土变化及灾害时空演化规律,建立冻土工程稳定性和服役性能评价体系,提出冻土工程灾害防治理论与控制对策,为冻土构筑物群灾害应急预案和重大冻土工程建设提供科学决策依据。 相似文献
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Bai-Shan Li Pei-Jiang Zhou Xi-Yuan Wang Liandong Zhu 《Journal of the Geological Society of India》2013,82(6):692-700
Hanjiang river is the longest river in Yangtze river basin, having high economic importance to China for its economically exploitable hydropower and potential water resources. In an attempt to satisfy China’s economic and social development needs, the Chinese government has established cascade dams and four relative water diversion projects in Hanjiang river, which aims at transferring water from south (Hanjiang river) to north (water-stricken areas). However, there are increasing eco-environmental concerns associated with the establishment and development of cascade hydropower. In this study, the opportunities and eco-environmental influences related to Hanjiang river’s cascade hydropower development are explored and then recommendations are put forward to minimize the potential impacts. The implementation of vigorous projects related to hydropower and water diversion has an important role to play in solving flood, energy and water shortage problems. In addition, the eco-environmental and socio-economic impacts on the middle and downstream and its diversion can be relieved to some degree in the area. However, the establishment of projects can cause several impacts on the local eco-environment. First, Danjiangkou reservoir construction can cause change in water flow, water bloom, soil erosion in the river basin. Second, it can directly lead to the decrease of 10.5 billion cubic meters of water in the middle- and downstream areas, threatening the local supply of drinking water and influencing farming irrigation and industrial production. Finally, the construction of cascade hydropower dams can change the water form and fish stocks may reduce threatening eco-environment security and environmental geology. 相似文献
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The Qinghai-Tibet Engineering Corridor (QTEC) is a strategic passage between Tibet and central China. In the past half century, several major projects have been built in this narrow corridor with vulnerable geoenvironment. Along with a new round of economic development of the Tibet autonomous region, some major linear projects including expressway, double-tracking railway, high voltage power transmission line have been incorporated into the national development planning within the corridor, and especially the expressway construction is imminent now. In the QTEC, permafrost is a controlling factor of geological environment, which will impose great restrictions on engineering construction. In turn, engineering construction will induce significant effects on permafrost geological environment. With more and more linear infrastructures crowding into the QTEC, the thermal interaction among permafrost engineering and engineering disturbance on permafrost thermal-mechanical regime will be more significant. With respect to this issue, a research program focusing on thermal-mechanical influences and environmental effects of expressway construction on the Qinghai-Tibet permafrost engineering corridor was started and supported by the National Natural Science Foundation of China. In this paper, the research significance, key scientific issues, main research contents and goals of the program are introduced so as to provide some references for related researchers and engineers. 相似文献
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Saad A. Aiban 《Engineering Geology》1995,39(3-4):203-215
The increasing number of construction projects and the lack of good quality soil for use in these projects in eastern Saudi Arabia necessitate the use of available marginal soils. Most, if not all, engineering projects use the fine-grained calcareous sediments, known locally as marl, either as a foundation material or as a fill material. The lack of published information on their engineering characteristics and behavior under ambient conditions has resulted in many construction and post-construction problems. This investigation is one of a series to evaluate the geotechnical properties of selected marl soils obtained from different areas in eastern Saudi Arabia. Marl samples, obtained from Abqaiq, were prepared in the laboratory under controlled conditions and subjected to different tests including CBR (soaked and unsoaked), triaxial compression, unconfined compression and one-dimensional compression tests. Samples were prepared at different moisture contents on both the wet and dry sides of optimum. X-ray diffraction analysis indicates that this marl contains high percentages of dolomite and calcite, in addition to other materials. The molding water content significantly affects the engineering properties of this material. Compaction on the dry side of optimum resulted in samples that have some swelling potential and highly compressible characteristics when subjected to a load after inundation. 相似文献
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Natural Hazards - Risk evaluation is crucial for the construction projects in the areas with high risk of geological hazards. In this paper, based on the projects of Mengshan tourism area,... 相似文献
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水利水电钻探是工程地质勘察的重要技术手段,通过钻探方式获取的工程地质资料是水利水电工程规划、设计和施工的重要依据。近年来,钻探技术在实践过程中不断发展和革新,包括随钻压水试验技术,自振法抽水试验技术,砂层、软土层和卵砾石层钻进及取样技术,大顶角斜孔钻进技术,声波钻探技术,全液压动力头式钻机,浅海钻探技术,水利水电帷幕灌浆自动记录仪等,掌握、合理选择和应用这些钻探技术方法对于优化水利水电工程勘察有着重要经济效益和社会效益。 本文还论述了水利水电工程钻探技术发展趋势。 相似文献