保护层厚度对钢筋混凝土等肢异形柱延性性能的影响   总被引：2，自引：2，他引：0  

宋家璐  张翼  张新培  高少波 《世界地震工程》2009,25(1)

采用非线性全过程数值计算方法,计算并分析了不同保护层厚度的L形、T形和十字形钢筋混凝土等肢异形柱在多种工况下的截面曲率延性值,发现了保护层厚度对混凝土等肢异形柱的截面曲率延性有重要的影响,进而提出了不同保护层厚度的混凝土等肢异形柱在各抗震等级下的轴压比限值的调整及其保护层厚度的控制标准的建议.  相似文献   

关于工程场地地震安全性评价中设计地震动反应谱的讨论   总被引：1，自引：1，他引：0  

王绍博  李斌  徐海云 《震灾防御技术》2006,1(4):302-308

本文对目前上海市工程场地地震安全性评价工作中设计地震动反应谱的确定方法进行了讨论。根据上海市地震环境和场地条件,以及地震安全性评价工作中尚存在的一些问题,对设计地震动反应谱的确定方法提出了建议。  相似文献   

Comprehensive Assessment of Inland Spatial Accessibility of the Northeast Seaports     

Han Zenglin  Shang Yanyan  Guo Jianke  Wang Shaobo 《地球科学进展》2017,32(5):502-512

The spatial accessibility between inland city and seaport plays a very important role in the process of industrial transformation and upgrading and reasonable layout of port and hinterland. Firstly, this paper began with the difference between seaport and inland-city about the property and the traffic flow on traffic network to define the meaning of inland spatial comprehensive accessibility of port. Then, the modified gravity model was used to measure the comprehensive accessibility level of the inland ports in the Northeast China, analyze the different spatial characteristics and explore finally the mechanism of its internal. The results showed that: ①The accessibility level of the Yingkou Port grew fast and surpassed the Dalian Port at last, the Jinzhou Port followed the Dalian Port, the Dandong Port caught up later, with the Panjin Port and the Huludao Port being slightly behind, but it was contrast with the “n” structure feature measured by the shortest travel time index and the weighted average travel time index. At the same time, the difference among the six ports was more significant in the hinterland of the overall improvement of the traffic network. ②The inland spatial accessibility of the six major ports is presented along the Harbin Dalian traffic. The level of spatial accessibility in western Liaoning and eastern Mongolia is higher than other areas. There exists a kind of “enclave” phenomenon about the port-inland spatial accessibility of the capital city and the resource type city which have strong comprehensive economic strength. ③Traffic cost between port and inland resistance promotes the formation of the basic pattern of inland space in the port, and the important traffic lines and the comprehensive “quality” promote the change of this basic pattern.  相似文献   

Oil and Gas Accumulation in the Foreland Basins, Central and Western China     

SONG Yan  ZHAO Menjun  LIU Shaobo  HONG Feng  FANG Shihu 《《地质学报》英文版》2010,84(2):382-405

<正>Foreland basin represents one of the most important hydrocarbon habitats in central and western China.To distinguish these foreland basins regionally,and according to the need of petroleum exploration and favorable exploration areas,the foreland basins in central and western China can be divided into three structural types:superimposed,retrogressive and reformative foreland basin(or thrust belt),each with distinctive petroleum system characteristics in their petroleum system components(such as the source rock,reservoir rock,caprock,time of oil and gas accumulation,the remolding of oil/gas reservoir after accumulation,and the favorable exploration area,etc.).The superimposed type foreland basins,as exemplified by the Kuqa Depression of the Tarim Basin, characterized by two stages of early and late foreland basin development,typically contain at least two hydrocarbon source beds,one deposited in the early foreland development and another in the later fault-trough lake stage.Hydrocarbon accumulations in this type of foreland basin often occur in multiple stages of the basin development,though most of the highly productive pools were formed during the late stage of hydrocarbon migration and entrapment(Himalayan period).This is in sharp contrast to the retrogressive foreland basins(only developing foreland basin during the Permian to Triassic) such as the western Sichuan Basin,where prolific hydrocarbon source rocks are associated with sediments deposited during the early stages of the foreland basin development.As a result, hydrocarbon accumulations in retrogressive foreland basins occur mainly in the early stage of basin evolution.The reformative foreland basins(only developing foreland basin during the Himalayan period) such as the northern Qaidam Basin,in contrast,contain organic-rich,lacustrine so urce rocks deposited only in fault-trough lake basins occurring prior to the reformative foreland development during the late Cenozoic,with hydrocarbon accumulations taking place relatively late(Himalayan period).Therefore,the ultimate hydrocarbon potentials in the three types of foreland basins are largely determined by the extent of spatial and temporal matching among the thrust belts,hydrocarbon source kitchens,and regional and local caprocks.  相似文献   

Pool-Forming Stages and Enrichment Models of Medium-to High-Rank Coalbed Methane     

SONG Yan  ZHAO Mengjun  HONG Feng  LIU Shaobo  QIN Shengfei  WANG Hongyan 《《地质学报》英文版》2010,84(6):1539-1546

<正>The pool-forming mechanism of coalbed methane has its own characteristics.In this paper, based on studies on the typical coal-bearing basins in China,it is pointed out that the reservoir formation of medium- to high-rank coalbed methane has experienced three critical stages:the coalbed methane generation and adsorption stage,the coalbed adsorption capacity enhancement stage,and the coalbed methane desorption-diffusion and preservation stage.The regional tectonic evolution, hydrodynamic conditions and sealing conditions play important roles in the stage of coalbed methane desorption-diffusion and preservation.Medium- to high-rank coalbed methane has three types of enrichment models,that is,the most favorable,the relatively favorable,and the unfavorable enrichment models.  相似文献   

一次超级单体风暴多普勒天气雷达资料的低层风场反演研究   总被引：3，自引：9，他引：3       下载免费PDF全文

张少波  陆汉城  康建伟 《气象科学》2007,27(2):147-154

本文使用二维变分风场反演方法对浙江台州2003年4月12日一次超级单体风暴的多普勒天气雷达探测资料进行低层风场反演研究。二维变分方法以均匀风场反演结果作为初猜场,在目标泛函中加入散度和涡度约束作为正则项来降低不适定性的影响。反演得到的低层水平风场比较好的符合超级单体风暴的组织化的气流结构和强的风切变,通过对散度场垂直积分获得垂直速度,上升气流主要集中在强回波区域,下沉气流一个位于风暴前进的左侧的弱回波区,一个位于钩状回波的内侧。  相似文献   

济阳拗陷孤岛油田渤21断块砂岩油藏流动单元研究   总被引：7，自引：0，他引：7  

谭成仵  乔明全等 《地质论评》2002,48(3):330-334

根据流动层带指标、孔隙度、渗透率、泥质含量、粒度中值等参数，采用灰色系统理论，将济阳拗陷孤岛油田渤21断块砂岩储层定量划分为5类流动单元。结合该地区的实际地质和生产状况等综合研究表明，各类流动单元分布对应于不同的沉积相带，具有不同的渗流特征，其与储层吸水、产液以及剩余油分布之间有密切的关系。流动单元I区水淹严重，流动单元Ⅳ、Ⅴ区为低孔、低渗，原始含油性本身较差，而流动单元Ⅱ、Ⅲ区是油田目前剩余油分布的主要区域。  相似文献   

丹江口水库诱发地震趋势研究   总被引：4，自引：0，他引：4  

黄乃安  张绍波 《华南地震》1991,11(4):67-74

本文研究了丹江口水库地震的特征和地震地质条件。据此，应用灰色系统方法，建立了水库地震的灰色聚类预测模型及水 库地震趋势的灰色灾变预测模型，运用灰色关第分析原理研究了水库规模与水库地地夺震级的关系。结果表明，丹江口水库的4.7级地震是第一期工程的最大地震，第二期工程竣工蓄水后诱发地震的最大震级不超过5.5级，该库坝按原定抗震烈度Ⅷ度设防是合理的。  相似文献   

莲花山斑岩型W－Au矿床成矿流体来源及其演化     

柳少波  王联魁 《世界地质》1996,(2)

莲花山斑岩型Ｗ－Ａｕ矿床矿化脉的流体包裹体氢氧同位素特征表明，成矿流体来自岩浆水与大气水的混合水，从早到晚，岩浆水成分减少，大气水成分增加。成矿流体的氧同位素、流体包裹体的盐度和成矿温度表明，较早的黑钨矿一石英脉形成于岩浆热能及热液向上推进的过程中，而后的白钨矿－硫化物－石英脉和碳酸盐－石英脉形成于岩浆热能及热液向下退缩的过程中。  相似文献   

侵入体中黑云母含铜性研究进展   总被引：1，自引：0，他引：1  

柳少波  王联魁 《地质科技情报》1995,14(3):67-72

总结了侵入体中黑云母铜含量的几种测试方法，概述了铜在不同地质环境黑云母中的含量变化特征、存在形式以及黑云母含铜性的实验研究的进展，并提出了黑云母含铜性研究中存在的问题及今后的研究方向。  相似文献