神华煤液化项目浩勒报吉水源地地下水开发研究

摘要：浩勒报吉水源地位于鄂尔多斯的白垩系自流水盆地的中东部，白垩系下统志丹群三、四岩段承压水含水层为主要供水含水层，地下水量丰质优，是神华煤直接液化项目的理想供水水源。本次施工的20眼探采结合井，单井涌水量约在3000m^3／d以上，对神华煤液化一期需水3.0万m^3／d是有保证的。     

剪切波速测试技术及场地土液化势判别

文章简要地介绍了剪切波测试技术的基本原理、野外测试方法及其在工程中的主要用途.结合工程实例,对于在资料处理中碰到的场地液化势判别的问题,采用石兆吉判别式,丁伯阳判别式,谢生荪判别式及标准贯入试验法等目前运用较多的多种液化判别方法进行对比分析,最后得出在本次工程中石兆吉判别式结果最切合本次工程,其结果予以采用,并且就液化判别问题提出了一些建议.     

湿陷性土地区工程建设质量问题综述

对湿陷性土地区勘察、设计、施工问题进行了论述 ,给出一些工程实例 ,对以后湿陷性土地区工程建设具一定的指导意义     

Modelling local GPS/levelling geoid undulations using artificial neural networks

The use of GPS for establishing height control in an area where levelling data are available can involve the so-called GPS/levelling technique. Modelling of the GPS/levelling geoid undulations has usually been carried out using polynomial surface fitting, least-squares collocation (LSC) and finite-element methods. Artificial neural networks (ANNs) have recently been used for many investigations, and proven to be effective in solving complex problems represented by noisy and missing data. In this study, a feed-forward ANN structure, learning the characteristics of the training data through the back-propagation algorithm, is employed to model the local GPS/levelling geoid surface. The GPS/levelling geoid undulations for Istanbul, Turkey, were estimated from GPS and precise levelling measurements obtained during a field study in the period 1998–99. The results are compared to those produced by two well-known conventional methods, namely polynomial fitting and LSC, in terms of root mean square error (RMSE) that ranged from 3.97 to 5.73 cm. The results show that ANNs can produce results that are comparable to polynomial fitting and LSC. The main advantage of the ANN-based surfaces seems to be the low deviations from the GPS/levelling data surface, which is particularly important for distorted levelling networks.     

Inversion of source parameters for moderate and small earthquakes in Beijing region

Introduction Beijing and the adjacent regions is a significant seismically active area and many geoscien- tists have studied to different extents the non-elastic attenuation and source parameters in the area. GAO et al (1986) and ZHUO et al (1990) studied the coda Q in the Beijing region by the method of dominant frequency and mechanical frequency division with the simulated data. With the con- tinuous construction of digital seismic station network, the digital data are more favorably used…     

2003年西藏波密南Ms5.7地震现场考察

2003年8月18日在西藏林芝地区发生的MS5．7地震的宏观震中位于波密县城扎木镇南13km的高山无人区。极震区烈度达到Ⅶ度。Ⅶ和Ⅵ度区面积分别为3200和11000km^2。这次地震的发生与NW向的嘉黎断裂和NE向的扎木-马尼翁断裂的活动有关。震区建筑物遭到一定程度的破坏或影响，地面破坏现象较明显。     

燕郊等测点迁移优化与地磁观测研究

为优化地磁观测条件，开展了燕郊、夏垫等测点迁移工作；按照测眯迁移原则与实施技术方案，完整地收集并整理了地质构造与地球物理等方面的基本资料；进行了野外实地勘察，磁场梯度的测量，确定了新测点，在新老测点上进行了较长时间的地磁场对比观测；应用多种方法分析研究了地磁对比观测资料，结果表明，新老测点与有关测点的地磁变化具有良好的一致性，并得到了新老测点之间的地磁数据的按点差。     

Site effects in Mexico City: Constraints from surface wave inversion of shallow refraction data

In order to understand and simulate site effects on strong ground motion records of recent earthquakes in Mexico City, it is fundamental to determine the in situ elastic and anelastic properties of the shallow stratigraphy of the basin. The main properties of interest are the shear wave velocities and Q-quality factors and their correlation with similar parameters in zones of the city. Despite population density and paved surfaces, it is feasible to gather shallow refraction data to obtain laterally homogeneous subsoil structures at some locations. We focused our analysis in the Texcoco Lake region of the northeastern Mexico City basin. This area consists of unconsolidated clay sediments, similar to those of the lake bed zone in Mexico City, where ground motion amplification and long duration disturbances are commonly observed. We recorded Rayleigh and Love waves using explosive and sledgehammer sources and 4.5 Hz vertical and horizontal geophones, respectively. Additionally, for the explosive source, we recorded three-component seismograms using 1 Hz seismometers. We obtained phase velocity dispersion curves from ray parameter-frequency domain analyses and inverted them for vertical distribution of S wave velocity. The initial model was obtained from a standard first-break refraction analysis. We also obtained an estimation of the Q_S shear wave quality factor for the uppermost stratigraphy. Results compare well with tilt and cone penetrometer resistance measurements at the same test site, emphasizing the importance of these studies for engineering purposes.     

中国早期的地震科学考察

叙述了翁文灏、谢家荣、王竹泉、李善帮等地震科学研究的开拓者对１９１３年云南峨山、１９１７年安徽霍山、１９２０年海原、１９３３年四川叠溪、１９３６年灵山、１９３７年山东菏泽等大地震进行的现场科学考察情况以及研究成果，指出这些成果和论著是中国近现代地震科学的奠基之作。认为，认真借鉴前人的研究成果，对地震科学的进步与发展，大有裨益。