我国现行抗震设计规范中场地评定方法的比较和评述

目前，我国抗震设计规范中采用的场地评定方法主要有两种：一是建筑抗震设计规范（ＧＢＪ１１－８９）采用的场地分类的方法，一是构筑物抗震设计规范（ＧＢ５０１９１－９３）和电力设施抗震设计规范采用的场地指数法。前者是把场地影响按照场地分类指标划分成若干场地类别，因此，确定的地震荷载是不连续的，跳跃变化的。后者是一种以模糊推论的综合评判方法导出的场地指数为指标进行连续评定的新方法，在这种方法里，场地性质的差     

近40年黄河流域资源环境格局变化分析与地质工作建议

20世纪80年代以来,自然演变与强烈的人类活动叠加,致使黄河流域资源环境格局发生了显著变化,进而影响其开发利用布局,面临诸多资源短缺、环境退化和生态破坏问题,急需从地球系统科学的视角深入研究流域资源环境的格局变化特点,识别重大资源环境问题,提出解决方案,为黄河流域可持续发展提供决策依据.本研究以"山水林田湖草"生命共同...     

集聚经济影响城市经济增长的理论基础与实证研究:文献述评与展望

集聚经济理论自诞生之日起便与城市经济增长存在着本源联系。论文系统梳理集聚经济理论的起源与发展,归纳集聚经济阐释城市空间形成与发展的核心思想,明确集聚经济与城市经济增长之间是具有本源联系的。进一步回顾集聚经济影响城市经济增长的程度与机制,发现以人口密度等指标为代表的集聚经济能够显著促进城市经济的增长,可从“宏观过程”与“微观过程”两大视角探寻城市集聚经济影响城市经济增长的解释机制。这一工作不仅是以往集聚经济与城市经济增长相关文献回顾的一个延续,也为后续集聚经济影响中国城市经济增长的实证研究提供了一个参照。     

应急专题符号库的设计与实现

应急专题符号是表述突发事件和应急信息、提供应急服务的专题性地图符号。针对一些软件自带符号库无法满足应急专题地图生产要求的问题,进行了应急专题符号库的设计与实现。根据应急专题地图的图面内容将应急专题符号划分为地理底图符号、应急要素符号和图幅整饰符号,分别进行相应设计,同时利用MapStore软件的符号定义模块实现了符号库,并在实际生产中进行了应用。实践结果表明,设计与实现的应急专题符号库合理、实用,能够提升应急专题地图的制图效率。     

城市地下管线信息管理系统的设计

数字管网和数字城市是信息时代的重要标志,该文探讨了城市地下管线信息管理系统的设计与建设,从而为数字管网的建设与完善提供借鉴。     

Development of Geological Data Warehouse

Data warehouse (DW), a new technology invented in 1990s, is more useful for integrating and analyzing massive data than traditional database. Its application in geology field can be divided into 3 phrases: 1992-1996, commercial data warehouse (CDW) appeared; 1996-1999, geological data warehouse (GDW) appeared and the geologists or geographers realized the importance of DW and began the studies on it, but the practical DW still followed the framework of DB; 2000 to present, geological data warehouse grows, and the theory of geo-spatial data warehouse (GSDW) has been developed but the research in geological area is still deficient except that in geography. Although some developments of GDW have been made, its core still follows the CDW-organizing data by time and brings about 3 problems: difficult to integrate the geological data, for the data feature more space than time; hard to store the massive data in fifferent levels due to the same reason; hardly support the spatial analysis if the data are organized by time as CDW does. So the GDW should be redesigned by organizing data by scale in order to store mass data in different levels and synthesize the data in different granularities, and choosing space control points to replace the former time control points so as to integrate different types of data by the method of storing one type data as one layer and then to superpose the layers. In addition, data cube, a wide used technology in CDW, will be no use in GDW, for the causality among the geological data is not so obvious as commercial data, as the data are the mixed result of many complex rules, and their analysis needs the special geological methods and software; on the other hand, data cube for mass and complex geo-data will devour too much store space to be practical. On this point, the main purpose of GDW may be fit for data integration unlike CDW for data analysis.     

Reliability level III method in design of square pillar resting on weak floor stratum

Summary Current methods of design of pillars resting on weak floor strata involve only a deterministic, conventional safety factor calculation, based on material parameters treated as the mean values taken from observations. In a case where high parameters variability occurs, these methods may lead to fatal design errors resulting in excessive pillar settlement and roof falls. Therefore, to include the influence of parameters quality, the new approach based on reliability level III method was developed. Consideration was given to the identification of the system parameters importance, and to density function for the safety factor treated as a random variable. Design procedure involving floor probability of failure was illustrated by numerical examples.     

云南曲靖地区筇竹寺组泥页岩储层发育特征与影响因素

以云南曲靖地区筇竹寺组泥页岩为例,利用氩离子抛光-场发射扫描电镜、高压压汞、常规扫描电镜等实验技术手段,探究泥页岩储层微观储集空间的发育类型与特征。结果表明：筇竹寺组泥页岩储层孔隙成因复杂,类型多样,主要发育的微观储集空间类型包括有机质孔隙、粘土矿物孔隙、颗粒矿物孔隙、微裂隙等,以有机质孔隙最为发育,提供了主要的储集空间;孔隙度介于1.59%~11.33%之间,平均值达到了5.0%,小孔、微孔所占储集空间比例约56.5%,中孔和超大孔所占比例为34.0%,大孔相对较少。控制筇竹寺组页岩孔隙发育的因素主要有TOC、矿物组分和成岩作用,TOC是影响筇竹寺组页岩储层孔隙发育的主控因素,也是提供页岩气主要储存空间的重要物质。     

四川盆地侏罗系大安寨段湖相含云质储层成因研究

四川盆地侏罗系大安寨段是典型的致密油发育层段,勘探开发成果揭示,大安寨储层岩性主要为介壳灰岩致密储层。侏罗系大安寨段致密油勘探开发成效引人关注,特别是近期川中南部侏罗系大安寨段滨浅湖相的GSTMX地区,大安寨段显示频繁,部署的GQ1H在大安寨段获得高产工业油流。根据对最新钻探的GQ1H井解剖表明,含云质岩具有更好的储集条件和含油气性,是储层"甜点"有利分布岩性。通过老井复查、岩心、岩屑、薄片、测井等综合分析表明,含云质储层岩性包括云质灰岩、灰质云岩和泥-粉晶云岩,储集空间主要为粒间、粒间溶孔和微裂缝,储层储集条件好,成像显示溶蚀孔洞发育,川中南部云化程度高于北部。根据碳氧同位素、X衍射、地层水特征以及古地形综合分析初步认为,四川盆地大安寨沉积时期虽然为淡水湖泊,但在古地形、古气候、沉积环境以及湖平面变化共同控制下,局部地区仍然发育一定规模的含云质储层,该认识为川中侏罗系大安寨段相对优质储层深化认识奠定了坚实的地质基础。     

基于概念设计的长短桩复合地基典型工程应用模式

本文从长短桩复合地基各组成部分的功能角度,阐述了长桩、短桩、褥垫层的作用机理,提出长短桩复合地基概念设计应遵循的设计原则。应用概念设计思想,建立了长短桩复合地基的五种典型工程应用模式,并在各典型模式的分析说明中,提出设计与施工参数的选用建议。通过在北京某工程的实际应用,显示长短桩复合地基的典型工程应用模式具有较好的实用性。