南海东北部下地壳高速层的成因探讨

通过对南海北部大陆边缘地壳结构分析,指出南海东北部存在下地壳高速层,大致分布在112°E~120°E,19°N~22°N的陆坡和拉张程度大的陆架地区,呈NEE向延伸,在海底地震仪剖面上最大的厚度有8km,向南海海盆方向减薄。通过对比综合分析认为,高速层物质组成是底侵作用形成的熔岩垫,由于伸展作用,南海海底扩张（30Ma）前后底侵作用形成了熔岩垫,并促使南海北部大陆边缘地壳抬升,导致区域性抬升剥蚀。     

柴达木盆地三湖地区磁力异常形成机理研究与异常分析

柴达木盆地的油气资源丰富,近年来在该区发现了大量异常显示,但是各种异常形成机理各不相同,存在较大多解性,使得该区油气储量探明率很低.根据柴达木盆地以往开展的常规非地震勘探的现状及效果,以磁测找油机理为基础,采用磁力资料化极、剩余磁力异常提取和磁力平剖图等处理手段,对三湖地区生物气藏磁异常进行分析研究,取得明显的异常显示效果.     

Slope stability FEM analysis and retaining wall design: a case study of clinker in Benxi of Liaoning

Stability is always the most important problem after high slope was excavated. The study analyzed the stress and strain inside the slope by Finite Element Method (FEM) and carried through stress distribution and failure zone, then analyzed the stability of the slope using three different methods and came to the conclusion that it is in unstable condition, so the designed retaining wall was put forward which makes the slope stable.     

两次区域性暴雨过程副高三维结构对比分析

为探讨夏季不同大气环流背景下区域性暴雨过程副高结构特征及其对降水的贡献,利用2005年6-7月降水量和NCEP／NCAR逐日再分析等资料,采用特征指数分析和物理量诊断方法,对比分析了2005年夏季两次区域性暴雨的副高三维结构特征。结果发现,夏季不同的大气环流背景下,两次区域性暴雨过程副高结构性质分别表现为热力性高压脊和动力性高压脊特征,从而导致两次暴雨过程的水汽供应条件和产生强烈上升运动的大尺度背景场存在差异。     

登陆广东热带气旋特征及其与副热带高压的关系

2004年登陆广东的热带气旋只有2个,个数明显偏少,粤西无热带气旋登陆;登陆广东的初台偏迟,终台结束早,登陆时间集中于7月;热带气旋移速快,强度弱(为热带风暴),对广东影响利大于弊。对1951~2004年7~9月登陆广东的热带气旋进行统计分析,发现各月登陆广东的热带气旋次数差异较大,最多时一个月有5个,最少时没有。登陆广东的热带气旋个数与西北太平洋副热带高压位置、强度有密切关系,可以将有利于和不利于热带气旋登陆广东的副热带高压各分为3种环流形势。     

Geotechnical Properties of Low Calcium and High Calcium Fly Ash

In this paper, a comparative study has been made for physical and engineering properties of low calcium and high calcium Indian fly ash. The grain size distribution of fly ash is independent of lime content. Fly ash particles of size >75 μm are mostly irregular in shape whereas finer fractions are spherical for low calcium fly ash. For high calcium fly ash, chemical and mineralogical differences have been observed for different size fractions. Compared to low calcium fly ash, optimum moisture content is low and maximum dry density is high for high calcium fly ash. Optimum moisture content is directly proportional and maximum dry density is inversely proportional to the carbon content. The mode and duration of curing have significant effect on strength and stress–strain behavior of compacted fly ash. The gain in strength with time for high calcium fly ash is very high compared to that of low calcium fly ash due to presence of reactive minerals and glassy phase.     

Deformation Mechanism and Stability of a Rocky Slope

A high slope is located on the side of the spillway at a hydropower station in Southwest China, which has some weak inter-layers inclining outwards. Parts of the slope show heavy weathering and unloading. There appeared deformation and tensile crack either on the surface or on the afteredge of the slope during excavation, and under a platform （elev. 488 m）, two levels of slopes collapsed on the downriver side. Based on the investigation in situ and the analysis of the geological structure, the conceptual model of deformation and failure mechanism was erected for this slope. Furthermore, the deformation characteristics were studied with FLAC^3D numerical simulation. Comprehensive analysis shows that the whole deformation of the slope is unloading rebound in certain depth scope and the whole body does not slide along any weak interlayer. In addition, two parts with prominent local deformation in the shallow layer of the slope show the models of ＂creep sfiding-tensile cracking＂ and ＂slidlng-tensile cracking＂, respectively. Based on the above analysis, the corresponding project of support and reinforcement is proposed to make the slope more stable.     

江苏丰、沛、铜地区高氟地下水成因探讨

通过该区太古界一新生界氟的地层地球化学剖面及岩浆岩和土壤中氟的丰度的研究,论证了该区为一高氟的地球化学区。根据重矿物对比研究和地貌分析,阐明了泰沂隆起区太古界和元古界的高氟古老岩系为该区土壤沉积物源,黄河多次泛滥堆积（粘土矿物对氟的吸附）对土壤氟起了叠加富集的作用。研究揭示该区土壤水溶氟较高,经降水淋滤和浸取作用氟转入地下水,并在凹陷区或河间洼地中聚集,水体停泄、蒸发浓缩形成高氟地下水区。     

高温炉燃烧-红外吸收法测定重铀酸盐中硫质量分数

建立了高温燃烧红外碳硫仪测定重铀酸盐中硫质量分数的分析方法。样品以五氧化二钒为助熔剂,在高温炉燃烧后,用红外吸收测定重铀酸盐中的硫,样品分析重现性好,精密度高,相对标准偏差为0.26%;样品加标回收率在97.1%~103%之间。     

高温高压下石英砂岩的电导率实验研究

利用交流阻抗谱实验技术,在0.5~2.0 GPa、573~873 K和10-1~106 Hz条件下,借助YJ-3000t紧装式六面顶高压设备和Solartron-1260阻抗/增益-相位分析仪测定了石英砂岩的电导率。实验结果表明:在测定的频率范围,样品的复阻抗的实部、虚部、模和相角对频率有很强的依赖性。随着温度升高,电导率增大,lgσT与1/T之间符合Arrhenius线性关系。通过拟合计算,获得了表征样品电学性质的指前因子、活化焓、活化能、活化体积等物性参数。杂质离子导电机制对高温高压下石英砂岩的导电行为提供了合理的解释。