地铁施工中水头分布的影响因素分析——以上海地铁东昌路车站为例

文章以东昌路地铁车站深基坑降承压水施工为背景 ,首先论述了水位降与影响半径之间的关系及其与理论值的比较 ,又根据实测数据重点讨论了井径、井管长度、过滤器位置以及介质各向异性对水头分布的影响。并对抽水过程中水头不降反升的异常现象作出了具体的分析。     

基于GIS的抗震设计地震动查询系统

基于ArcView CIS软件开发平台，建立了设计地震动参数和最不利设计地震动数据库，建成了基于性态设计和考虑最不利设计地震动因素的设计地震动查询系统，该系统主要为基于PC机工作的结构抗震设计人员提供相应的设计地震动参数和最不利设计地震动的设计地震动信息查询服务。     

抗震设计谱的发展及相关问题综述

抗震设计谱是地震荷载的表征和工程抗震设计的基础。首先对国内外抗震设计反应谱的发展、演变进行了阐述，指出现今反应谱理论以及在此基础上建立的抗震设计谱所取得的进展；总结了被广泛使用的各种抗震设计谱所存在的问题，指出了解决问题的可能途径，简要介绍了双规准反应谱的概念和统一设计谱的思想；探讨了抗震设计谱的发展趋势以及所涉及的新课题。     

Progress and trend on near-field problems in civil engineering

Introduction The characteristics of ground motions recorded near the fault of an earthquake are quite dif- ferent from the usual far-field ground motions. After the original recognition of their differences in the Port Hueneme earthquake in 1957, a great lot of inhabited structures and lifeline systems were damaged in the major earthquakes happened in the following years. The damages were beyond minds of seismologists and engineers. A quite rational reason is the lack of enough knowledge of t…     

塞浦路斯黄铁矿矿床的成因

黄铁矿矿床的地质概况塞浦路斯岛的中心由特罗多斯火成杂岩体组成,其边部为层状沉积岩.主要的黄铁矿矿床即产于火成杂岩体与上覆沉积物的接触带上或其附近.最下部的沉积层为佩拉佩德希层,该层局部含有火山碎屑-沉积岩,但总的看来,它以独立的单位发育.主要的黄铁矿矿床与该层密切伴生,据推测,二者具有相同的成因.分类与说明浸染状、块状、脉状、洞穴和(或)空隙     

Representation of near-fault pulse-type ground motions

Near-fault ground motions with long-period pulses have been identified as critical in the design of structures. To aid in the representation of this special type of motion, eight simple pulses that characterize the effects of either the fling-step or forward-directivity are considered. Relationships between pulse amplitudes and velocity pulse period for different pulses are discussed. Representative ratios and peak acceleration amplification can exhibit distinctive features depending on variations in pulse duration, amplitude and the selected acceleration pulse shape. Additionally, response spectral characteristics for the equivalent pulses are identified and compared in terms of fixed PGA and PGV, respectively. Response spectra are strongly affected by the duration of pulses and the shape of the basic pulses. Finally, dynamic time history response features of a damped SDOF system subjected to pulse excitations are examined. These special aspects of pulse waveforms and their response spectra should be taken into account in the estimation of ground motions for a project site close to a fault.     

地震人员伤亡估算方法研究

本文将目前国内外地震人员伤亡的评估方法区分为将生命损失用货币单位来衡量和单独估算人员伤亡数量两大类,并对评估方法进行了系统归纳总结,在此基础上,利用以倒塌率为主要影响因素的6种估算方法对1976年唐山地震,1996年云南丽江7．0级地震及内蒙古包头西6．4级地震的人员伤亡进行了评估,并与三次地震人员伤亡的实际统计结构进行了比较,最后,提出了一种较精确,适用的伤亡评估方法。     

空间直角坐标计算大地坐标的抛物线逼近法

采用抛物线逼近法求解大地纬度和大地高,先计算空间点在椭球面上的子午面坐标,然后求解点的大地纬度和大地高。     

关于建立区域坐标系的再讨论

继文献 [1]后就建立区域坐标系问题 ,阐明了基本概念、原则和特点 ,并对工程测量与坐标系的关系以及长度变形等问题进行了分析 ,提供了一个地区区域的划分、组建和长度变形示例。