桩承载力时效对桩土相互作用及沉降的影响分析

对软土中两根47 m长灌注桩分别在成桩28 d和1 750 d后进行了承载力试验，其极限承载力提高幅度达到30％左右。分析了单桩承载力随时间提高(称为时效)的机理，提出了单桩承载力时效对桩筏基础桩土相互作用影响的分析方法，并结合工程实例进行了分析。     

武汉长江底钻孔同位素单井法地下水流速、流向测试

本文论述了在武汉市长江底部第四纪孔隙含水层中用单井稀释法测定地下水流速、流向实验的过程和结果。并对在这种试验条件下所得的测定结果进行分析讨论,得出了相应的结论。测试结果表明:武汉长江底部JC II 6号钻孔处地下水流向从上到下都受到地表长江水流的影响。上部受到影响大,而深部较弱,地下水流向从上到下逐渐向东偏转35°左右。上部中细砂层中的地下水流速,大于下部粗中砂层中地下水流速。本次测试由于测定点靠近江心地下水排泄带,其地下水和地表水的水头差0 5m左右,试验虽然采取了特殊的施工工艺,也还可能受到垂向流的微小影响,使测试结果中的水流速度比实际地下水水流速度可能要稍偏大些。但因本点水文地质条件决定了三段之间或地下水流和江水之间无明显的水头差,所以引起的误差不大,可以忽略不计。     

Inelastic displacement ratios for evaluation of existing structures

Results of a detailed statistical study of constant relative strength inelastic displacement ratios to estimate maximum lateral inelastic displacement demands on existing structures from maximum lateral elastic displacement demands are presented. These ratios were computed for single‐degree‐of‐freedom systems with different levels of lateral strength normalized to the strength required to remain elastic when subjected to a relatively large ensemble of recorded earthquake ground motions. Three groups of soil conditions with shear wave velocities higher than 180m/s are considered. The influence of period of vibration, level of lateral yielding strength, site conditions, earthquake magnitude, distance to the source, and strain‐hardening ratio are evaluated and discussed. Mean inelastic displacement ratios and those associated with various percentiles are presented. A special emphasis is given to the dispersion of these ratios. It is concluded that distance to the source has a negligible influence on constant relative strength inelastic displacement ratios. However, for periods smaller than 1s earthquake magnitude and soil conditions have a moderate influence on these ratios. Strain hardening decreases maximum inelastic displacement at a fairly constant rate depending on the level of relative strength for periods of vibration longer than about 1.0s while it decreases maximum inelastic displacement non‐linearly as the period of vibration shortens and as the relative‐strength ratio increases for periods of vibration shorter than 1.0s. Finally, results from non‐linear regression analyses are presented that provide a simplified expression to be used to approximate mean inelastic displacement ratios during the evaluation of existing structures built on firm sites. Copyright © 2003 John Wiley & Sons, Ltd.     

A procedure for evaluating seismic energy demand of framed structures

Energy serves as an alternative index to response quantities like force or displacement to include the duration‐related seismic damage effect. A procedure to evaluate the absorbed energy in a multistorey frame from energy spectra was developed. For low‐ to medium‐rise frames, it required a static pushover analysis of the structure to determine the modal yield force and ductility factor of an equivalent single‐degree‐of‐freedom system for the first two modes. The energy spectra were then used to determine the energy contribution of each mode. A procedure was also developed to distribute the energy along the frame height based on energy shapes. This study showed that the second‐mode response in some cases needs to be considered to reflect the energy (or damage) concentration in the upper floors. Copyright © 2002 John Wiley & Sons, Ltd.     

数字地籍测绘实施中的技术问题

数字地籍测绘是目前土地管理部门的首选方案,需要制定街坊划分、界址线设定、工作底图与采集草图一体化作业、数据文件管理、街坊线、图斑的绘制等技术措施。     

基于图像区域特征的细胞识别方法及实现

先提取目标物体的面积、中心矩、圆形度、细长度、核浆比等区域特征。然后采用单原型模式表征方法，利用集群分析技术中最小距离分类器，构造判别函数，并依此作为识别类型的依据。最后，通过对鳞细胞的区域特征进行计算比较，选择出能够较明显地辨别出类别的特征向量，建立判别函数并对结果的可信度进行了讨论。     

按不同气候背景制作单站MOS预报方程

在基层业务体制的框架基本形成以后，县局在参考上级指导预报的同时，初步开展对单站数值预报模式的研究，注意中、小尺度天气的变化规律，以提高订正预报的精度。     

单块积云降水参数的直接估算

介绍了单块积云的雷达回波参数与降雨参数的一元、二元回归分析分析结果表明，单块积云的降雨量、雨强和持续时间与雷达皮的顶高、面积的相关性较好。     

激光探针质谱及单颗粒矿物^40Ar／^39Ar法年龄的测定

将掺钕的钇铝榴石（Ｎｄ：ＹＡＧ）激光器与高精密ＭＭ１２００质谱计、电子倍增器联网，应用连续激光质谱对单颗粒矿物、光片样品进行微区４０Ａｒ／３９Ａｒ测年、坪年龄和等时线年龄研究。在光片上测定南极乔治王岛北海岸玄武岩等时线年龄（５２．３８±１．０５）Ｍａ和贵州绿豆岩年龄（２３９．１６±１４．１３）Ｍａ，两者与实际地质背景吻合。对两个中生代和太古代单颗粒黑云母进行连续激光质谱阶段升温４０Ａｒ／３９Ａｒ坪年龄谱测定，获得与常规法相一致的坪年龄谱     

硫酸盐渍土膨胀规律的综合影响因素的试验研究

对含氯化钠硫酸盐渍土的膨胀规律作了综合影响因素的研究，首次提出了５因素盐胀率的计算公式，并得出了盐胀率的单因素和交互作用影响的规律；另外找出了某些因素的定量指标。