X射线荧光光谱快速分析铝土矿的方法研究   总被引：7，自引：4，他引：7  

邓赛文  梁国立  方明渭  田寅贞  强小平  王有增 《岩矿测试》2001,20(4):305-308

使用日本理学3070型X射线荧光光谱仪,采用粉末直接压片和经验系数校正基体效应的方法,在矿山实验室实现了铝土矿样品中Al  相似文献   

巴东长江大桥地质环境与岩土工程问题研究     

刘佑荣  唐辉明等 《地球科学》2001,26(4):410-414

巴东长江大桥是连接209国道的特大型公路大桥，地处长江三峡地质条件最复杂的地区，桥位区滑坡崩塌较发育。为确保大桥安全稳定并为设计提供科学依据，采用结构面网络模拟技术进行了岩体结构模拟，应用弹塑性有限元法及块体极限平衡法，对桥位存在的桥台斜坡和桥墩基础地基稳定性等岩土工程问题进行了系统的分析论述。同时，对断裂破碎岩体及风化岩体、滑坡对大桥的影响进行了分析。在此基础上提出了桥墩基础形式、桩基深度、持力层及承载力和桥台斜坡治理的建议。  相似文献   

Derivation of design soil coefficients (S) and response spectral shapes for Eurocode 8 using the European Strong-Motion Database   总被引：1，自引：0，他引：1  

Julien Rey  Ezio Faccioli  Julian J. Bommer 《Journal of Seismology》2002,6(4):547-555

A revision is presently under way to upgrade the status of the `Designrecommendations for earthquake resistance of structures', commonlyreferred to as Eurocode 8 (or EC8). In order to improve the definition ofthe design elastic response spectra (ERS) as defined in the Eurocode 8 –Part 1 (Draft May 2001), the values of the soil amplification factors havebeen calculated for sites on sedimentary soils, both stiff (category B) andsoft (category C), with respect to rock sites (category A), such ascontemplated in EC8. The work was performed by a systematic study ofresponse spectra as a function of magnitude and site conditions, usingrecords from the European Strong-Motion Database.The results confirm the occurrence of systematic spectral amplification onsedimentary soils with respect to reference rock in a large set of Europeanstrong motion data. Such amplification has been quantified through ameasure derived from the Housner Spectrum Intensity definition.The values of the soil coefficients recommended in the current version ofEC 8 are shown to be realistic for category C, in the case of a moderateseismicity context. However the values for subsoil class B need to besignificantly increased both for the moderate and high seismicity context.  相似文献   

开山石填海挤淤区非均匀软弱地基的治理     

彭涛  武威 《水文地质工程地质》2002,29(1):54-57

对开山石填海挤淤形成的非均匀软弱地基进行处理时，由于工程性质很差、厚度较大、沉降固结历时较长且数值较大的淤泥层位于开山石回填层之下，地基处理比较困难。本文介绍了一个经济、合理的地基处理方法，对沿海地区大量存在的同类工程具有参考价值。  相似文献   

Prioritizing conservation potential of arid-land montane natural springs and associated riparian areas     

Bruce C. Thompson  Patricia L. Matusik-Rowan  Kenneth G. Boykin   《Journal of Arid Environments》2002,50(4):527

Using inventory data and input from natural resource professionals, we developed a classification system that categorizes conservation potential for montane natural springs. This system contains 18 classes based on the presence of a riparian patch, wetland species, surface water, and evidence of human activity. We measured physical and biological components of 276 montane springs in the Oscura Mountains above 1450 m and the San Andres Mountains above 1300 m in southern New Mexico. Two of the 18 classes were not represented during the inventory, indicating the system applies to conditions beyond the montane springs in our study area. The class type observed most often (73 springs) had a riparian patch, perennial surface water, and human evidence. We assessed our system in relation to 13 other wetland and riparian classification systems regarding approach, area of applicability, intended users, validation, ease of use, and examination of system response. Our classification can be used to rapidly assess priority of conservation potential for isolated riparian sites, especially springs, in arid landscapes. We recommend (1) including this classification in conservation planning, (2) removing deleterious structures from high-priority sites, and (3) assessing efficiency and use of this classification scheme elsewhere.  相似文献   

地基土地震液化评价方法探讨     

王如金 《上海国土资源》1992,(2):61-64

本文对现行的“抗震设计规范”中有关地震液化评价条文进行了探讨,提出了以单元体及场地土作为评价单元,尝试引出了判别指标”场地单元体液化指数 A”。另外,对在评价过程中遇到的几个问题进行了讨论,如:贯入击数基准值的选用,软夹层的处理等。  相似文献   

以电阻率测量资料为基础评价珙县磷铵厂建筑场地条件     

蒋泽雄  董玉善 《四川地震》1992,(4)

本文根据在珙县磷铵厂建筑场地视电阻率测量的结果,将场地分为三个区,并结合钻探触探结果对各区的工程地质条件、邻区地震的影响等进行了具体的评价。给该厂的建筑设计提供了较确切的依据,改变了原建筑布局方案,收到了较好的效果。  相似文献   

川北—陕南地区高放废物处置库场地的预选     

吴敬炳  隆盛银 《华东地质学院学报》1992,15(2):195-200

  相似文献   

对高美古选址云量观测可靠性的讨论     

李秋莎 《天文研究与技术》1999,(3):12

通过对新月和满月夜期间测光夜数和云量统计数的比较, 高美古的天文测光夜数和可用夜数与丽江县的气象晴日数的比较, 以及在同样的观测时间高美古和丽江县云量观测值的比较, 本文对高美古选址云量观测可靠性的有关方面进行了讨论  相似文献   

The story of statistics in geotechnical engineering     

Kok-Kwang Phoon 《Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards》2020,14(1):3-25

  相似文献