大桥安全监控技术的研究     

冯小磊  华锡生 《现代测绘》2005,28(1):5-8

针对特大型桥梁运行期间的安全监测对精度和实时自动化的要求,探讨了在大桥的位移监测中自动全站仪精密测控的问题,对大气折光的高程测量影响和灰关联模型在大气折光系数处理中的应用进行了研究,并介绍了大桥安全监控系统的结构和安全监控中数据处理的数学模型等问题.通过结合当前大桥监控中的具体问题进行研究,取得了一定成果,有一定的应用价值.  相似文献   

岩土破损演化理论(Ⅱ):物理状态指标与分区破损理论   总被引：11，自引：0，他引：11  

党发宁 《岩土力学》2005,26(5):673-679

指出当前利用CT数研究岩土力学的所有方法仅为观察研究,浪费了宝贵的CT定量化信息。利用集合论和测度论知识,基于CT数定义了岩土材料的λ水平破损比与λ水平破损率、(λ1-λ2)水平截理比及其截理率的概念,研究了λ水平破损率与CT数及密度的关系;研究了破损产生的位置和破损判据。基于破损空间截理的概念将岩土材料区分为安全区、损伤进行区和破损区,定义了损伤进行区下、上限边界面,给出了强化-弱化准则的定义,建立了岩土体分区破损本构关系,并进一步推导了岩土破损空间理论的基本方程。  相似文献   

Extraction of Coal Under a Surface Water Body – a Strata Control Investigation     

A. Gandhe  V. Venkateswarlu  R. N. Gupta 《Rock Mechanics and Rock Engineering》2005,38(5):399-410

Summary. The extraction of coal seams under built-up structures and especially under water bodies has been a challenge to the miners due to the potential risk of disturbance to the surface. A number of safety and ground control problems are associated with the mining operations under water bodies. These can be dealt with through proper planning for the optimization of coal recovery and systematic strata control investigations. At Godavari khani (GDK) no. 3 incline of the Singareni Collieries Company Limited (SCCL), two panels namely SS-10/1A and SS-10/1B in no. 1 seam, were identified for extraction under the surface water body called Janagaon tank. A feasibility study was carried out by the authors for working these panels, and hydraulic sand stowing method was recommended. Further, strata behaviour monitoring was carried out using remote type geotechnical instruments during the extraction of pillars in one of the panels. The extraction of the pillars in the experimental panel progressed smoothly without any strata control problems. The mine management could extract coal reserves in the panel with more than 60% recovery, which were otherwise unworkable. This paper presents the feasibility of extraction of pillars under the Janagaon tank, and strata behaviour observations made during the actual extraction.  相似文献   

The importance of paleoseismology in seismic hazard studies for critical facilities   总被引：1，自引：0，他引：1  

Aybars Gürpinar   《Tectonophysics》2005,408(1-4):23

This paper is intended to provide a perspective on the use of paleoseismological studies in the seismic hazard assessment of critical facilities, such as dams, chemical/petrochemical facilities and nuclear power plants. In particular, the use of data obtained from paleoseismological studies for probabilistic seismic hazard analyses, when the required probabilities of exceedance are very low (e.g. 10^{− 6}–10^{− 7}) is considered. Recent revisions to the IAEA Safety Standards that provide guidance to Member States in their work related to the seismic safety of nuclear power plants are presented to illustrate the importance of this emerging discipline.  相似文献   

The Principle and Method for Delineation of Potential Seismic Sources in Northwest Yunnan     

Zhou Qing 《中国地震研究》2005,19(2):201-213

INTRODUCTION Withrapideconomicdevelopment,deficiencyofelectricalpowerisbecomingincreasinglysevere.Therefore,theconstructionofmorehydropowerstationsinSouthwestChinawherehydropowerresources areabundantisinevitable.Presently,severalcascadepowerstationsarepla…  相似文献   

A Methodological Approach for the Evaluation of Urban and Territorial Seismic Vulnerability     

A. Teramo  A. Bottari  D. Termini  C. Bottari 《Pure and Applied Geophysics》2005,162(4):659-670

A methodology of urban and territorial vulnerability analysis related both to engineering studies and social priority levels is presented. Modelling an urban system as a set of elements and relations, the evaluation of seismic vulnerability is carried out through suitable functions that characterize the seismic reliability of the site in terms of the geotechnical reliability of the ground and a structural reliability of buildings regarding the importance of activities referable to each element of the system. The results of the study, represented in map form, allow a full characterization of the distribution of urban and territorial vulnerability aimed at a seismic risk mitigation.  相似文献   

考虑土体强度的建筑基坑突涌问题分析   总被引：7，自引：1，他引：7  

谭松林 《地球科学》2002,27(2):209-211,216

基于土体的强度特性，并假设突涌破坏体为方柱体或圆柱体，推导出了考虑土体强度的基坑突涌稳定性计算公式，计算结果表明，对于一般的粘性土， 考虑其强度后的抗力分项系数比不考虑强度的抗力分项系数增加二倍以上，汉口地区许多基坑开挖并没有出现突涌现象，表明土体的抗剪强度对抗力起着不可忽视的作用，因此考虑土体强度的突涌稳定性分析是比较接近工程实际的。  相似文献   

气相起爆系统可靠性试验研究          下载免费PDF全文

陈建平  魏伴云  张志波  梁庆国 《探矿工程》2002,(2):65-67

对气相起爆系统传爆的可靠性和连接的可靠性以及安全使用等方面进行了实验室研究和探讨。通过测试，分析了影响传爆可靠性的几种因素，对常用网路连接方式进行了优劣比较，提出了起爆系统安全使用条件。  相似文献   

气温、气压对飞行安全的影响分析     

王永忠 《南京气象学院学报》2001,24(2):291-294

分析了气温，气压变化造成的高度表误差及气温及气温的变化带来的飞 机空速表误差，认为现行民航航线飞行安全高度的规定存在一定的不足，并提出了改进办法。  相似文献   

对坦墙墙后土体第二破裂面的研究   总被引：3，自引：0，他引：3  

杨雪强  范瑛 《岩土工程技术》2001,(1):14-17,48

基于土的塑性极限分析理论，从挡土墙最小抗倾覆安全系数和挡土墙背上的最大主动土压力两个角度，分别研究了坦墙后土体中第二破裂面的位置，认为在复杂的挡土结构墙背条件下，用最小抗倾覆安全系数来研究挡土墙后土体的破坏机制较为合理。  相似文献