珠江口盆地白云北坡珠江组下部陆架边缘沉积演化

根据层序地层学理论,运用地震相、地震沉积学等分析手段,结合钻井、测井等资料,对珠江口盆地白云北坡珠江组下部的沉积演化进行了研究,研究发现:珠江组下部发育陆架边缘三角洲-海相沉积体系,地震剖面中陆架边缘三角洲前缘分布在Y2井区及以南区域,平面上呈菱形,其两侧发育改造的滨海砂坝,南部发育斜坡浊积扇,这三者形成了海退体系中的主要岩性圈闭;X1、Y1井区及以北发育海进体系中的滨海砂坝圈闭。海平面升降、物源供给和构造古地貌对沉积演化和圈闭形成过程中起明显的控制作用。21.0~19.0Ma期间,海平面下降和河流回春作用是形成陆架边缘三角洲的主要原因,构造古地貌及其控制的古水深控制了相带展布与边界。     

城市气象与边界层数值模拟研究

综合评述关于城市气象与边界层数值模拟的近期研究进展,主要就城市气候研究、城市能量平衡、城市热岛研究以及城市陆面过程与城市地表能量平衡模式等方面国内外主要研究工作,结合作者近期的研究工作和认识作一评述.从中提出一些现实与观点方面的问题,给出一些看法和讨论.最后,就当今比较流行并显示十分有效的城市气象和城市边界层数值模拟作一些讨论,着重对这一领域面临的现行研究和未来的挑战,提出一些思考.评述结果表明:①今后需针对我国不同气候区、不同城市特点和建筑物形态特征,开展城市气候、城市地表能量平衡、城市热岛等方面的观测与模拟研究;②在城市气象观测方法与技术导则、观测站网布局、新型观测手段的综合使用等方面的深入研究需进一步展开;③需建立基于时间、天气条件、建筑特征的简单的城市热岛强度预报方法;④可探索采用计算流体力学(CFD)模式作为桥梁,检验并改进中尺度模式对城市地区的模拟效果.     

Temperature-dependent water retention curve model for both adsorption and capillarity

Acta Geotechnica - A temperature-dependent water retention curve (WRC) model is necessary in numerous geotechnical engineering cases such as the disposal and storage of nuclear waste, buried...     

Influences of Tibetan Plateau uplift on provenance evolution of the paleo-Pearl River

Acta Geochimica - A comparative analysis of the geochemical characteristics of sediments from the Oligocene Zhuhai Formation (32–23.8 Ma), the Miocene Zhujiang Formation...     

Development of Soil Mechanics and Present Situation of Centrifugal Modelling Test

This paper firstly describes the development history and the present situation of soil mechanics, them shows features and the complicacy of geotechnical engineering and soil mechanics. All this may lead to the conclusion that the problems concerning soil mechanics and geotechnical engineering cannot be perfectly solved only with the present soil mechanics theory and numerical method. The centrifugal modelling test, owing to its replication property of in-situ stress level of structures, can be used to predict the working condition of geotechnical engineering, or to verify some principles of soil mechanics. For this reason, this testing method is getting popular. However the centrifugal modelling test just play a complementary role rather than a repellent role to the present research methods.     

变形对非饱和土渗透系数影响规律模拟研究

渗透系数是非饱和土渗流分析中最重要的参数。本文以概率、统计理论为基础,结合流体力学的基本方程,建立了一个能够考虑孔隙结构影响的饱和土渗透系数计算模型,而后结合Mualeum(1976)的相对渗透系数模型以及Assouline(2006)提出并验证的孔隙结构参数随变形的变化规律,模拟了变形对非饱和土渗透系数的影响,通过和试验数据以及已有的模型对比。     

油藏数值模拟技术现状分析

对目前国际上油藏数值模拟技术的发展现状及今后的发展方向作了简要介绍 ;对我国目前在这一领域的研究现状以及与国际先进水平间存在的差距进行了分析 ,并指出了今后努力的方向。     

Environmental Geochemistry of Fluorine in the Rock—Soil—Water System in the Karst Region of Central Guizhou Province

Systematic determination of and adsorption experiment on fluorine in the carbonate rock-soil-water system in the karst region studied in Guzhou Province,in conjunction with the mineral surface and soil chemistry data,have revealed the geochemical characteristics of F and the mechanisms of its transport and entrichment in the rock-soil-water-system of the karst region central guizhou province,Deep-seated underground waters(-100m or lower)and soil layers in the karst region of central Guizhou are characterized by high-F anomalies whereas shallow-level underground and surface waters by low contents of F(mostly lower than 05mg/L).Fluorine in soil and water in the region studied comes largely from Triassic marine strata dominated by gypsum-bearing carbonate rocks.The special adsorption and desorption of F on the surface of geothite in soil layers are the important mechanisms of its transport and enrichment in the rock-soil-water system of the karst region studied.     

不同围压下板岩三轴压缩过程能量及损伤分析

根据不同围压下板岩三轴试验的结果,研究不同围压下板岩的能量变化规律和损伤分析。研究结果表明,不同变形阶段板岩的弹性应变能、耗散能的变化情况不同,弹性应变能先增加后减小,耗散能加载初期几乎为零,进入屈服段急剧增加。根据弹性应变能与总吸收能之比将岩石压缩过程中裂隙发展划分为3个阶段：裂隙稳定发展阶段、裂隙加速发展阶段和裂隙贯通阶段。岩样破坏后总吸收能、耗散能与围压的关系表明,从开始加载到屈服段,畸变比能和体变比能之和U^e'大体等于弹性应变能U^e;从屈服段到峰值强度,U^e'小于U^e且差值越来越大。从能量角度定义损伤变量,认为：低围压状态对应较低的耗散能、较高的损伤值;高围压状态对应较高的耗散能、较低的损伤值。     

GPS/CORS精密区域地表位移动态监测技术研究

提出一种同时适用于中等距离和短距离范围的GPS/CORS准实时动态监测技术,并详细论述该技术实现厘米级甚至毫米级动态监测的算法模型和实现方法.基于GDCORS数据进行了准实时地表形变位移动态监测的试验,监测结果不仅验证了上述动态定位模型的正确性,也为基于GPS/CORS监测技术对省级区域地质灾害进行连续高时空分辨率监测的应用提供了参考.