复合地基垫层的减振作用分析     

王凤池  朱浮声  林勇 《世界地震工程》2004,20(3):109-113

从垫层桩基的减振机理出发，分析了垫层桩基和复合地基的等效性，提出了复合地基的减振机理和减振动力模型。复合地基的减振性能主要体现在减小振幅、粘滞阻尼耗能和摩擦耗能上。根据复合地基的减振机理，可把基础和垫层简化为多自由度的质、阻、弹振动体系，同时考虑滑动摩擦作用。最后，提出了按减振思想设计和施工复合地基的要求。  相似文献   

地震数据处理解释一体化在隐蔽油气藏勘探中的应用     

ZhouJinming 《应用地球物理》2004,1(2):95-102

Nowadays, it becomes very urgent to find remain oil under the oil shortage worldwide.However, most of simple reservoirs have been discovered and those undiscovered are mostly complex structural, stratigraphic and lithologic ones. Summarized in this paper is the integrated seismic processing/interpretation technique established on the basis of pre-stack AVO processing and interpretation.Information feedbacks occurred between the pre-stack and post-stack processes so as to improve the accuracy in utilization of data and avoid pitfalls in seismic attributes. Through the integration of seismic data with geologic data, parameters that were most essential to describing hydrocarbon characteristics were determined and comprehensively appraised, and regularities of reservoir generation and distribution were described so as to accurately appraise reservoirs, delineate favorite traps and pinpoint wells.  相似文献   

Effect of ‘species weighting’ on conservation status evaluation: a case study with light-traped adult caddisflies (Insecta: Trichoptera)     

Dnes Schmera 《Limnologica》2004,34(3):274-278

Wildlife conservation requires methods to express the conservation status of assemblages in order to identify those of importance. Expressions of diversity and a number of different conservation status indices are widely used techniques for assessing assemblages. Some of these indices are based on species lists, while others use abundances. In this study, the conservation statuses of 21 light-traped adult caddisfly assemblages were compared using species lists and abundance data. The results showed that the assessment based on species list provided a higher conservation status than that based on species abundances. Consequently, indices incorporating species abundances were not comparable with indices using only species lists. The difference between the two measures might be derived from the unequal weighting of species categories. In conclusion, incorporating species abundance reduces sampling method bias and increases the precision of the conservation status evaluation.  相似文献   

云母复合材料板的合成研制     

黄和明  徐文炘  郭陀珠 《矿产与地质》2004,18(6):594-597

选择了云母作为纤维矿物材料替换石棉，填料选用叶蜡石、方解石和方镁石等矿物，进行云母复合材料板合成，并详细解析分别由云母、云母 方解石、云母 叶蜡石 方解石、云母 方解石 叶蜡石 方镁石等一元、二元、三元和四元等材料合成的复合材料板的物理性质和机械性能，得出了以多元矿物材料合成的制品的质量优于单元矿物材料合成的制品，以四元矿物材料合成的云母复合材料板可任意切割，复合材料的厚度可达到5mm左右。  相似文献   

Types of Karst-fractured and Porous Reservoirs in China＇s Carbonates and the Nature of the Tahe Oilfield in the Tarim Basin     

ZHANGKang WANGDarui 《《地质学报》英文版》2004,78(3):866-872

Almost all the oil and gas reservoirs developed in marine sedimentary strata of China have undergone processes of multi-phase reservoir formation and later modification. The irregular reservoirs are classified into three types as the Naxi, Tahe and Renqiu ones, increasing successively in the development degree of karstificated pores and fissures and the connection degree of independent reservoirs. In these reservoirs, the unity in the fluid feature, pressure and oil-gaswater interface also increases successively from the Naxi to the Renqiu type. The main body of Ordovician reservoirs of the Tahe Oilfield in the Tarim Basin is a network pool rather than a stratified, massive, stratigraphically-unconformed or weathering-crust one. The fluid nature of oil, gas and water, the interface positions and the pressures, as well as the dynamic conditions of fluids within the reservoirs during the production are all different from those in stratified or massive oil and gas reservoirs. Carbonates in the Akekule uplift and the Tahe Oilfield are assemblages of various types of reservoirs, which have an overall oH-bearing potential and obvious uneven distribution. Testing and producing tests are the major means to evaluate this type of reservoirs and acid fracturing improvement is a key link in petroleum exploration and development.  相似文献   

基于边-节点和原子属性的多比例尺GIS数据模型     

黄慧 《武汉大学学报(信息科学版)》2004,29(12):1067-1070

针对当前多比例尺GIS存在的数据冗余问题，提出并实现了一种基于边-节点和原子属性的数据模型，在模型中较好地解决了复合属性问题，并讨论了该模型在实际应用中的适应性和可扩展性。  相似文献   

组合砌体房屋抗震性能试验研究及分析     

王新平  钟岱辉  胡伟 《地震工程与工程振动》2005,25(1):88-91

对1／4比例的9层组合砌体房屋模型进行了拟静力试验，得到此类结构的有关抗震性能指标，在此基础上，对试验模型和原型房屋进行了非线性地震反应分析，探讨了此类房屋的动力反应特性，对组合砌体房屋的抗震能力作出了较为客观的评价，并对应采取的抗震措施提出了建议。  相似文献   

碎石桩复合地基振动响应试验分析     

齐迪冯志仁  陈剑平 《地震工程与工程振动》2005,25(5):132-136

采用激振法和衰减测试对碎石桩复合地基块体振动响应进行现场试验，分析了该复合地基在不同激振方式下的振动反应规律，提出了碎石桩复合地基抗压、抗弯、抗剪刚度系数线性关系。同时通过试验对比，分析了自由振动与强迫振动两种测试方法对于碎石桩复合地基测试结果的适宜性，这对复合地基的理论研究及动力基础的天然地基的设计、试验和研究都具有实际意义。  相似文献   

西北地区春季和夏季降水异常特征分析   总被引：7，自引：0，他引：7  

黄山江  王谦谦  刘星燕 《南京气象学院学报》2004,27(3):336-346

用EOF分析方法选取西北地区29个代表站,分别对其春季和夏季近50a降水进行年际变化和年代际变化时空特征分析,发现西北地区近50a降水时空趋势变化以103°E为基准线,以西为正,以东为负,并有准3a的振荡周期;20世纪80年代中期西北地区春季降水出现了气候突变,西北地区多、少雨与500hPa高度场和副热带高压的位置和强弱密切相关。  相似文献   

烃浓度盖层封闭天然气的有效性及其研究意义   总被引：7，自引：1，他引：7  

严俊君  金之钧 《沉积学报》1997,15(1):141-151

本文在烃浓度盖层封闭机理及其形成地质条件分析的基础上，通过烃浓度盖层封闭能力形成时期的确定，利用其与气源岩排气门限的匹配关系，探讨了烃浓度盖层封闭天然气的有效性。烃浓度盖层封闭能力形成时期只有早于或相近于气源岩排气门限时，才能有效地封闭气源岩排出呈分子扩散相运移的天然气；否则其封闭的有效性变差。并以松辽盆地三肇凹陷青山口组烃浓度盖层对下伏侏罗系气源岩天然气封闭的有效性为例进行分析，阐明其在天然气远景资源评价中的重要意义。  相似文献