景观建筑挡土墙优化设计后抗震性能的实验测试研究

目前的景观建筑设计中往往更注重建筑的景观性,而忽略了建筑的安全稳定性,导致景观建筑的整体抗震效果较差,在景观建筑设计中加入挡土墙设计可以有效提高其抗震性。为此,设计一种具有一定抗震性能的景观建筑挡土墙,利用建筑施工过程中保留的复合纤维材料、建筑垃圾以及纤维绳等作为土墙填充物,并加入具有一定抗拉能力的拉筋材料,以保持土墙内部的稳定性。考虑景观建筑通常注重外观视觉效果,使用"平改坡"设计,在墙体表面种植具有一定视觉冲击的植物,增加土墙自重,促进土墙整体结构的稳定性。分析挡土墙后面无限倾斜填土受力状态,选取菱形微小单元体作为研究对象,计算景观建筑的挡土墙土压力强度。实验证明,优化设计的景观建筑挡土墙结构可以有效增强景观建筑的整体抗震能力。     

保国寺大雄宝殿抗震性能分析及加固对策探讨

通过对保国寺大殿结构振动特性现场测试,得到大殿时程分析和频谱分析,结合建筑结构、材料以及使用现状,建立有限元分析模型,并用模态分析验证该建模的真实性。结合宁波地区场地条件,通过该有限元模型在不同烈度地震作用下的反应,评定地震破坏程度。根据现场调查及模型分析结果给出保国寺大殿维护与加固建议。     

地理信息技术发展的新方向——网格GIS初探

网格GIS是网格及网格计算技术与GIS相结合而形成的新的GIS发展方向,具有空间资源共享、海量空间数据存储与处理、异地协同工作与异构系统支持等功能,在城市管理、房地产管理、资源勘测与调查等方面具有十分重要的作用。本文在分析网格GIS的概念及其特征的基础上,提出了网格GIS的四层结构体系,并简要介绍了网格GIS实现的关键技术。     

Palynofacies classification of submarine fan depositional environments: Outcrop examples from the Marnoso-Arenacea Formation,Italy

Basin floor fans contain some of the largest deep-water hydrocarbon accumulations discovered, however they also demonstrate extremely complex stratigraphic architecture, understanding of which is crucial for maximum recovery. Here we develop a new method, based upon palynofacies analysis, for the distinction of the different depositional environments that are commonly associated with basin floor fans. Previous studies and our sedimentological analysis allow good confidence in the discrimination of the different depositional environments of the outcropping Marnoso-Arenacea Formation fan system. One hundred and thirty-five samples were collected from mudstones in conjunction with sedimentary logging of 871 m of outcrops. Six lithofacies associations are described and interpreted to represent lobe axis, lobe fringe, fan fringe, contained interlobe, basin plain, and starved high depositional sub-environments. Palynofacies of these elements demonstrate turbidites to be rich in terrestrial organic matter, with sixteen categories of matter recognised. The abundances and proportions of particles varies between sub-environments, with lobe axis deposits containing the largest, densest particles, with a transition to ever smaller and lighter particles moving toward the basin plain. Fuzzy C-means statistical analysis was used to explore this trend. Distribution of organic matter is not random, but is dominated by hydrodynamic sorting and sequential fall-out of particles as turbidity currents passed across the basin. This allows a palynofacies classification scheme to be constructed to assist the identification of depositional environments of submarine fans, which may be combined with subsurface data to assist reservoir characterisation.     

Examining fault architecture and strain distribution using geospatial and geomechanical modelling: An example from the Qaidam basin,NE Tibet

The investigation of complex geological setting is still dominated by traditional geo-data collection and analytical techniques, e.g., stratigraphic logging, dip data measurements, structural ground mapping, seismic interpretation, balance section restoration, forward modelling, etc. Despite the advantages of improving our understanding in structural geometry and fault architecture, the geospatial modelling, applying computer-aided three-dimensional geometric design, visualization and interpretation, has rarely been applied to such complex geological setting. This study used the Lenghu fold-and-thrust belt (in Qaidam basin, NE Tibetan Plateau) to demonstrate that the application of geospatial and geomechanical modelling could improve our understanding and provide an effective technique for investigating the fault architecture and strain distribution. The three-dimensional configuration of the Lenghu fold-and-thrust belt was initially derived from traditional analysis techniques, such as regional stratigraphic logging, cross section construction, meso-scale ground mapping and landsat image interpretation. The high-resolution field data and landsat image were integrated to construct the geospatial model, which was subsequently used to quantitatively investigate the fault throw changes along the Lenghu thrust fault zone and to understand its control on the lateral structural variation. The geospatial model was then restored in three dimensions to reveal the kinematic evolution of the Lenghu fold-and-thrust belt. Geomechanical modelling, using a Mass-Spring algorithm, provided an effective three-dimensional tool for structural strain analysis, which was used to predict the strain distribution throughout the overall structure, e.g., normal faults with throws ranging from meters to tens of meters in the hanging-wall. The strain distribution predicted by geomechanical modelling was then validated by the natural normal faults in the hanging-wall. The high accordance between the strain prediction and statistics of natural normal faults demonstrates good applicability of geospatial and geomechanical modelling in the complex geological setting of the Lenghu fold-and-thrust belt. The geospatial models and geomechanical models, therefore, can provide a robust technique for analyzing and interpreting multi-source data within a three-dimensional environment. We anticipate that the application of three-dimensional geospatial modelling and geomechanical modelling, integrating both multi-source geologic data and three-dimensional analytical techniques, can provide an effective workflow for investigating the fault architecture and strain distribution at different scales (e.g., ranging from regional-to meso-scale).     

地磁台网高压直流输电判别处理系统设计

介绍地磁高压直流输电干扰自动判断处理系统的主要功能、架构设计和运行流程,并对其核心功能的实现过程进行描述。本系统为全国地磁观测人员处理高压直流输电干扰提供具体时间、幅度参考标准,有利于地磁预处理数据质量的提高。     

解读建筑工程防震标准

本文在概述建筑工程防震标准的同时, 提出了工程地震需要注意的9个问题, 以便更好地为其工程建设服务.     

网格计算的应用--构建随需应变的IT基础架构

随着网络和分布式计算技术的发展,网格作为一种新型的IT基础架构在企业得到了越来越多的应用。本文介绍了网格计算的基本架构,并通过一组实际应用的案例说明了如何构建数据网格、计算网格和服务网格。     

改进SPIHT算法及硬件高速实现

基于小波变换的SPIHT图像压缩方案是一种实用高性能图象压缩编码算法,但原始SPIHT算法链表式编码限制了其在高速处理中的应用。本文提出了一种改进的SPIHT压缩编码算法,在确保恢复图像质量与原始算法基本相当的基础上,改进算法可以采用并行流水结构实现,有利于高速处理中的应用,可以对高达40×8Mbit／s的原始图像实时压缩和去压缩。     

Computerised development control and approval system for City Hall of Kuala Lumpur

This paper will discuss the computerised development control and approval system being developed for the Planning and Development Control Department, City Hall of Kuala Lumpur, with stress on the GIS architecture developed within the system. The prospects and challenges towards implementation of the system are also discussed.