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31.
区域地壳稳定性研究的后顾与前瞻 总被引:2,自引:0,他引:2
文章回顾了中国区域地壳稳定性研究的历史,划分了其发展阶段,阐述了不同学派的基本观点,分析了该领域面临的新挑战并指出了其未来的发展方向。明确提出,在活动地区选出并评价相对稳定地块(安全岛)作为重大工程场址将是未来的主流。 相似文献
32.
Different models were developed for evaluating the probabilistic three-dimensional (3-D) stability analysis of earth slopes and embankments under earthquake loading. The 3-D slope stability model assumed is that of a simple cylindrical failure surface. The probabilistic models evaluate the probability of failure under seismic loading considering the randomness of earthquake occurrence, and earthquake induced acceleration and uncertainties stemming from the discrepancies between laboratory-measured and in-situ values of shear strength parameters. The models also takes into consideration the spatial variabilities and correlations of soil properties. The probabilistic analysis and design approach is capable of obtaining the 2-D and 3-D static and dynamic safety factors, the probability of slope failure, the earthquake induced acceleration coefficient, the yield acceleration coefficient, the earthquake induced displacement, and the probability of allowable displacement exceedance taking into account the local site effect. The approach is applied to a well known landslide case: Congress Street Landslide in Chicago. A sensitivity analysis was conducted on the different parameters involved in the models by applying those models to the Congress Street landslide considering different levels of seismic hazard. Also, a sensitivity analysis was carried out to study the sensitivity of computed results to input parameters of undrained shear strength, and corrective factors. A comparison was made between the different models of failure. The parametric study revealed that the hypocentral distance and earthquake magnitude have major influence on the earthquake induced displacement, probability of failure and dynamic 2-D and 3-D safety factors. 相似文献
33.
保证国家资源安全的矿产资源基础研究思考 总被引:2,自引:3,他引:2
战略性矿产资源的基础研究是建立国家安全体系的关键之一。应加强成矿动力学研究,努力开拓成矿地球化学动力学新领域,注意发现矿床新类型,挖掘空白区,矿集区找矿潜力,加强深部找矿和成矿域,带研究,实施资源环境一体化,尽快建立我国矿产资源资源基础研究创新体系。 相似文献
34.
35.
A. A. Amin 《Environmental Geology》1999,39(1):20-24
The geological hazards along part of Al-Sayl Alkabeir Al-Jammum road, western Saudi Arabia, were studied by the use of the
sterographic projection to define the types of possible failures and the magnitude of safety factor on each slope face. The
studied area consists of granite and granodiorite rocks that were cut by acidic and basic dikes. There are four sets of structural
discontinuities which, besides a few strike slip faults, constitute the planes of weakness that lead to a variety of possible
mode failures. The stability analysis indicates that sections of the road are unstable as their cut slopes exceed the maximum
safe slope angles which range between 65° and 73°.
Received: 16 June 1998 · Accepted: 2 March 1999 相似文献
36.
文章介绍了海上生产大数据分析以及海上安全生产情景构建的概念,阐述了海上安全生产情景构建的特点、情景构建的基本方法及情景构建的内容,并介绍了这种创新的安全生产管理模式在海上船舶的紧急撤离及海上溢油事故的紧急处置的应用实例。随着大数据技术应用的不断发展,在海上安全生产上的应用也将不断扩大,从而增强应急资源共享和信息整合的可操作性,减低海上生产运行的风险,大大提高海上生产的安全管理水平。 相似文献
37.
斜坡坡面地质灾害SNS柔性防护系统概论 总被引:7,自引:0,他引:7
在简单分析评价国内现有坡面地质灾害防治现状的基础上 ,介绍了以钢丝绳网为主要构成材料的 SNS( Safty Netting System)主动覆盖和被动拦截柔性防护系统的基本构成和功能特征 ,从而阐明了该项新技术在防护功能、标准化设计与施工作业以及对复杂地形的适应性和安全可靠性等方面的技术经济优势。 相似文献
38.
《Marine Policy》2014
In the last few decades, use of foreign labor in the Norwegian fishing fleet has increased. As fishing is a high-risk occupation, this article investigates a prevalent question regarding how the increased share of foreigners affects communication and safety on Norwegian fishing vessels. The article shows that multilingual crews and varying language proficiencies are not perceived by the fisheries actors themselves as risk factors in terms of safety in everyday operations. Fishing experience, hybrid language and body language compensate for language challenges and contribute to fishers' feeling of safety. 相似文献
39.
湖南省农村房屋安全性现状统计分析 总被引:2,自引:1,他引:1
本文汇总了湖南省农村房屋的安全性等级情况资料,从房屋的建造年代、结构形式、各年代所建房屋的危房率以及居民的住房质量、安全意识与房屋抗震性能的对比几个方面进行了房屋安全性状况统计分析.结合房屋典型损坏现象,分析了此次调查中房屋的损坏特征,总结了各种结构形式容易出现的问题.根据房屋典型损坏现象分析和安全性等级情况统计,得出了以下结论:湖南省农村生土结构和木结构房屋的安全性现状不容乐观;有关部门应制定一套适合农村的结构设计规范,并通过培训等方法解决农村房屋设计和施工问题;部分存在潜在严重地质灾害的地区和大山深处的房屋已无改造、新建的意义,最好整体搬迁. 相似文献
40.