框架-密肋复合墙结构新体系研究   总被引：16，自引：0，他引：16  

郭猛  姚谦峰 《地震工程与工程振动》2009,29(5)

结合密肋复合墙结构的研究成果和框架结构抗震性能的发展趋势,提出一类新型结构体系:框架-密肋复合墙结构体系.简要介绍了密肋复合墙结构受力特点,阐述了将密肋复合墙引入框架结构的重要意义,即增强大震下框架结构的抗震能力,扩展密肋复合墙结构在工业与民用建筑中的应用范围,以及丰富多高层框架结构整体加固方法等.根据外框架类型和密肋墙对抗侧刚度贡献机制的不同,对框架-密肋复合墙结构进行了分类,详细介绍了正在进行研究的几种结构形式,并指出现阶段框架-密肋复合墙结构的研究内容和方向.  相似文献   

济阳坳陷临南洼陷油气运聚方向与分布规律   总被引：3，自引：1，他引：2  

刘惠民 《现代地质》2009,23(5):894-901

构造应力场、流体势、断面形态特征及其与输导层产状的匹配关系对油气运聚有显著影响。研究结果表明：济阳坳陷临南洼陷油气优势运移方向表现为自生油洼陷向周边,以近SN向运移为主,至临商、夏口断裂带,则上盘的断裂凹面处、断面的凸脊、下盘的断裂凸面处及输导层与断面形成的构造脊是油气运移和汇聚的优势通道和方向;油气藏分布整体表现为沿着油气优势运移通道与方向“顺藤结果”、“沿枝开花”的格局;断裂的侧向封堵性导致临南地区不同位置的含油性差异,构造样式的差异性导致不同盆地结构单元的成藏模式不同。  相似文献   

脉冲编码可控震源信号设计   总被引：2，自引：0，他引：2       下载免费PDF全文

王忠仁  高健  孙锋 《地球物理学进展》2008,23(6):1931-1935

通过脉冲编码技术使震源向地下激发出可人为控制的变步长的脉冲序列,采用解码技术将这种连续多次小能量激发情形的原始地震记录转换为等价的单次大能量激发的地震记录.文中通过数值模拟技术对脉冲编码震源信号地震响应的规律和特点进行了研究.模拟结果表明,脉冲编码信号冲击间隔的增量是压制相关噪声的关键因素,调整冲击间隔的增量对相关噪声的影响要比增加冲击次数对相关噪声的影响灵敏得多,而重复的冲击间隔对压制相关噪声不起任何作用.  相似文献   

Upper mantle anisotropy beneath central and southwest Japan: An insight into subduction-induced mantle flow   总被引：1，自引：0，他引：1  

Mohamed K. Salah  T. Seno  T. Iidaka 《Journal of Geodynamics》2008,46(1-2):21-37

Analysis of seismic anisotropy in the crust and mantle wedge above subduction zones gives much information about the dynamic processes inside the Earth. For this reason, we measure shear wave polarization anisotropy in the crust and upper mantle beneath central and southwestern Japan from local shallow, intermediate, and deep earthquakes occurring in the subducting Pacific slab. We analyze S phases from 198 earthquakes recorded at 42 Japanese F-net broadband seismic stations. This data set yields a total of 980 splitting parameter pairs for central and southwestern Japan. Dominant fast polarization directions of shear waves obtained at most stations in the Kanto–Izu–Tokai areas are oriented WNW–ESE, which are sub-parallel to the subduction direction of the Pacific plate. However, minor fast polarization directions are oriented in NNE–SSW directions being parallel to the strike of the Japan Trench, especially in the north of Izu Peninsula and the northern Tokai district. Generally, fast directions obtained at stations located in Kii Peninsula and the Chubu district are oriented ENE–WSW, almost parallel to the Nankai Trough, although some fast directions have NW–SE trends. The fast directions obtained at stations in northern central Honshu are oriented N–S. Delay times vary considerably and range from 0.1 to 1.25 s depending on the source depth and the degree of anisotropy along the ray path. These lateral variations in splitting character suggest that the nature of anisotropy is quite different between the studied areas. Beneath Kanto–Tokai, the observed WNW–ESE fast directions are probably caused by the olivine A-fabric induced by the corner flow. However, the slab morphology in this region is relatively complicated as the Philippine Sea slab is overriding the Pacific slab. This complex tectonic setting may induce lateral heterogeneity in the flow and stress state of the mantle wedge, and may have produced NNE–SSW orientations of fast directions. The ENE–WSW fast directions in Kii Peninsula and the Chubu district are more coherent and may be partly induced by the subduction of the Philippine Sea plate. The N–S fast directions in northern central Honshu might be produced by the trench-parallel stretching of the wedge due to the curved slab at the arc–arc junction.  相似文献   

Seismic anisotropy of upper mantle in Sichuan and adjacent regions   总被引：9，自引：0，他引：9  

LiJun Chang  ChunYong Wang  ZhiFeng Ding 《中国科学D辑(英文版)》2008,51(12):1683-1693

Based on the polarization analysis of teleseismic SKS waveform data recorded at 94 broadband seis-mic stations in Sichuan and adjacent regions, the SKS fast-wave direction and the delay time between the fast and slow shear waves were determined at each station using the grid searching method of minimum transverse energy and the stacking analysis method, and the image of upper mantle anisot-ropy was acquired. The fast-wave polarization directions are mainly NW-SE in the study area, NWW-SEE to its northeast and NS to its west. The delay time falls into the interval [0.47 s, 1.68 s]. The spatial variation of the fast-wave directions is similar to the variation of GPS velocity directions. The anisotropic image indicates that the regional tectonic stress field has resulted in deformation and flow of upper mantle material, and made the alignment of upper mantle peridotite lattice parallel to the di-rection of material deformation. The crust-upper mantle deformation in Sichuan and adjacent regions accords with the mode of vertically coherent deformation. In the eastern Tibetan Plateau, the crustal material was extruded to east or southeast due to SE traction force of the upper mantle material. The extrusion might be obstructed by a rigid block under the Sichuan Basin and the crust has been de-formed. After a long-term accumulation of tectonic strain energy, the accumulative energy suddenly released in Yingxiu town of the Longmenshan region, and Wenchuan MS8.0 earthquake occurred.  相似文献   

侯西金矿床地质特征及找矿方向          下载免费PDF全文

王来军  牟振山 《地质找矿论丛》1999,14(3):64-70

论述了侯西金矿床的控矿断裂特征,矿体地质特征,矿石特征;总结了矿化富集规律和找矿标志,指出了深部及外围的找矿方向,并探讨了矿床的成因  相似文献   

山东乳山石英脉型金矿侧伏规律及找矿方向   总被引：5，自引：0，他引：5  

沈远超  曾庆栋 《黄金地质》1999,5(3):1-5

山东乳山中部发育石英脉型金矿,金矿分布和产出受ＮＮＥ向及ＮＥＥ向断裂构造控制,具有棋盘格式分布规律,其中ＮＮＥ向断裂是区内金矿脉的定位构造。金矿床矿体侧伏具有同一断裂带分布的不同金矿床矿体侧伏方向两两相反,相邻断裂带中的金矿床矿体侧伏方向相同的规律。根据矿体侧伏规律指出了找矿方向。  相似文献   

总应力分析强度指标中的几个问题     

罗嗣海  潘小青  胡立明 《地质科技情报》1999,18(4):93-96

就破坏面方位、剪切前固结应力状态、剪切应力路径及主应力偏转对总应力强度指标的影响及解决的途径作了简要分析。  相似文献   

磁法考古探测应用机制及其应用效果   总被引：3，自引：1，他引：2  

张寅生 《物探与化探》1999,23(2):138-145

对地下文物的磁性通过模拟实验和实际应用研究,系统地阐明了应用磁法探测地下文物的机制、方法、特点和效果.从野外测量、资料处理到成果解释循序渐进地探索了磁法考古的工作方法、技术特点、异常规律和推断解释方法等.通过实例介绍,阐述了可操作性强,宜于推广应用的工作系统;并侧重论述了磁探考古应用的优越性及其应用前景,指出了进一步研究的内容和方向.  相似文献   

扬子地台北缘地壳演化与金成矿特征   总被引：3，自引：0，他引：3       下载免费PDF全文

涂怀奎 《地质找矿论丛》1999,9(3):17-24

文章讨论了扬子地台北缘地壳演化,地层分区,构造分带和金成矿特征,确定大部分大中型金矿位于扬子地台北缘裂谷系,微古陆内外接触带。认为该区经历了复杂的地质构造演化,形成了不同的金矿类型与矿化组合。最后总结了找矿方向。  相似文献