计算机图形软件编制地图的探讨     

路长城  黎海滨 《江苏地质》2005,29(3):165-167

阐述了利用Coreldraw8．0图形软件来完成《连云港市市区图》的设计和具体编制的方法，利用Coreldraw8．0图形软件的特性来提高制图效率、成图质量。结合在地图编制工作中遇到的问题，对计算机制图和传统地图理论的结合、发展提出一些看法。  相似文献   

氡气勘查地球化学技术的研究与应用--氡气地球化学特性、方法原理、异常模式   总被引：7，自引：1，他引：7  

贾国相  赵友方  姚锦其  黎绍杰 《矿产与地质》2005,19(1):60-65

从氧的地球化特性、氧气测量方法的原理、氧的地球化学晕的形成机理及氧气异常模式的确立等方面，阐述了氧气勘查地球化学技术在油气勘查应用研究中的概况。认为该技术在方法、原理及应用效果等方面的研究已日趋成熟，应用该项技术，在油气藏上方的土壤或岩石中，已查明氧气呈环状晕圈特征，并且，这一规律被反复得到证实和公认，可进一步在油气勘查领域推广应用。  相似文献   

从水流挟沙力和河槽形态规律分析黄河调水调沙   总被引：3，自引：0，他引：3  

张遂业  涂启华 《水文》2005,25(6):33-36

在分析水流挟沙力和河槽水力形态规律的基础上，研究调节流量、含沙量和泥沙组成的优化组合，解决河道输沙减淤和河槽相对稳定问题，提出调水调沙方向。达到合理利用水资源和河道减淤与治理相结合的目的．  相似文献   

滑坡钢筋砼格构防治"倒梁法"内力计算研究   总被引：2，自引：0，他引：2  

殷跃平 《水文地质工程地质》2005,32(6):52-56

格构锚固技术能有效地控制滑坡深部和浅表破坏,提高锚固体系的整体刚度。目前在格构 锚杆体系的设计中,大多采用经验设计钢筋砼格构,常导致配筋不合理,不仅造成浪费,而且可能埋下工程隐患。本文采用“倒梁法”对格构梁的内力计算方法进行研究,对滑坡防护钢筋格构进行如下简化:(1)锚杆对格构梁的作用以垂向力为主,轴向力可以忽略不计。(2)纵向格构梁的刚度大于横向格构梁的刚度,因而横向格构梁的内力计算可以简化,钢筋砼格构可以作为在锚杆施力下的超静定连续梁。结合三峡工程库区巫山新城秀峰寺滑坡格构防护工程设计,通过“三弯矩方程”进行了格构梁内力实例计算,为格构梁的合理设计提供了依据。  相似文献   

论"单位涌水量就是导水系数"   总被引：2，自引：0，他引：2  

兰太权 《地下水》2007,29(5):43-45,68

单位涌水量是井抽水水位降深换算为1 m时的单井出水量;导水系数是含水层宽度为1 m时,地下水水力坡度为1时的单宽流量.二者之间从定义上看毫无关系,但它们的单位(m3/d·m)(m2/d)是相同的.笔者经过多年探讨和初步试验后发现,单位涌水量就是管井抽水所利用含水层的导水系数.  相似文献   

滨海多层含水层系统中海潮引起的地下水位波动     

郭巧娜  李海龙  夏玉强  李国徽 《地下水》2007,29(2):27-31

通过对一个滨海多层含水层系统的考察,该含水层系统由上、下弱透水层和介于中间的承压含水层组成,海底露头处被淤泥层覆盖.建立了描述该系统中地下水水头随潮汐波动的数学模型,并得到其解析解.该解析解与六个基本参数有关,分别是承压含水层的海潮传播参数,淤泥层的无量纲透水系数,上下弱透层与承压含水层贮水率的比率 (无量纲)和上下弱透层的无量纲越流.当这些参数取某些特殊值时,我们的解便化简为前人考虑的几种简单情形对应的解.分析表明,承压含水层中地下水水头波幅是上、下弱透水层贮水率和越流系数的减函数,是淤泥层相对透水系数的增函数;波动相位(时滞)是上、下弱透水层贮水率和越流系数的增函数,是淤泥层相对透水系数的减函数.  相似文献   

Structural style and deformation mechanism of the southern Dabashan foreland fold-and-thrust belt, central China     

Li Zhiwu  Liu Shugen  Luo Yuhong  Liu Shun  Xu Guoqiang 《Frontiers of Earth Science》2007,1(2):181-193

The Daba Mountains define the southern margin of the East Qinling orogenic belt, and form the boundary of the Sichuan basin in the north and northeast. The Daba Mountains can be divided into two structural belts by the NW-striking Chengkou fault, namely the northern Dabashan thrust-nappe belt and the southern Dabashan foreland fold-and-thrust belt. The southern Dabashan fold-and-thrust belt is a southwestward extruding thin-skinned thrust wedge, showing obvious belted change in deformation style and deformation intensity along the dip direction, and can be divided further into three sub-belts, i.e. the imbricate thrust sub-belt characterized by imbricate stepped-thrust sheets, the thrust-fold sub-belt characterized by the combination of the equally-developed thrusts and related folds, and the detachment-fold sub-belt characterized by box folds and closed overturned-isoclinal folds on the outcrops. Several kinds of structures have been recognized or inferred, including imbricate thrust system, passive-roof duplex (triangle zone), fault-related folds, back-thrust system and pop-up structure. The NE-SW compressive stress from the Qinling orogenic belt and detachment layers in the covering strata are the two most important determinants of deformation style. After the collision between the North China block and Yangtze block at the end of the Middle Triassic, the northward intracontinental subduction along the southern edge of the Qinling orogenic belt was initiated, which led to the corresponding southward thrusting in the upper crust. The thrusting propagated towards the foreland through the Jurassic and extended to the southernmost part of the southern Daba Mountains around the end of the Early Cretaceous, with thrusting deformation to be preferentially developed along major detachment layers and progressing upwards from the Lower Sinian through the Lower Cambrian and Silurian to Middle-Lower Triassic. Translated from Geotectonica et Metallogenia, 2006, 30(3): 294–304 [译自: 大地构造与成矿学]  相似文献   

Water supply potential and optimal exploitation capacity of karst aquifer systems   总被引：1，自引：0，他引：1  

Igor Jemcov 《Environmental Geology》2007,51(5):767-773

The management of groundwater flow systems in karst regions appears, at present, to be the most important procedure for solving water deficiency problems during periods of low rainfall. Faced with a lack of data for characterizing the water supply potential of karst aquifers, analyses of spring hydrographs may provide valuable indirect information regarding the structure of karst hydrogeological systems. To estimate the optimal exploitation capacities of karstic sources, a stochastic-conceptual approach was applied in case studies from the Serbian karst. Water supply potentials were initially evaluated on the basis of groundwater budgets. Further steps towards defining optimal “exploitable” regimes included analyses of storage changes in karst water reservoirs under natural conditions and calculation of the potential expansion of currently tapped sources. The results obtained through these analyses are a significant contribution to feasibility studies and aid in the avoidance of problems of overexploitation.  相似文献   

Experimental and numerical study of soil-reinforcement effects on the low-strain stiffness and bearing capacity of shallow foundations     

Wilson Chung  Giovanni Cascante 《Geotechnical and Geological Engineering》2007,25(3):265-281

This paper presents results of meticulous laboratory testing and numerical simulations on the effect of reinforcement on the low-strain stiffness and bearing capacity of shallow foundations on dry sand. The effect of the location and the number of reinforcement layers is studied in the laboratory, whereas numerical simulations are used to study the reinforcement-foundation interaction. Laboratory tests show an increase of 100, 200, and 275% not only in bearing capacity but also in low-strain stiffness (linear load–displacement behaviour) of a square foundation when one, two, and three layers of reinforcement are used, respectively. The specimen preparation technique is found to be crucial for the repeatability and reliability of the laboratory results (less than 5% variability). Numerical simulations demonstrate that if reinforcements are placed up to a depth of one footing width (B) below the foundation, better re-distribution of the load to deeper layers is achieved, thus reducing the stresses and strains underneath the foundation. Numerical simulations and experimental results clearly identify a critical zone between 0.3 and 0.5B, where maximum benefits not only on the bearing capacity but also on the low-strain stiffness of the foundation are obtained. Therefore, soil reinforcement can also be used to reduce low-strain vibrations of foundations.  相似文献   

贵州兴仁滥木厂汞铊矿床矿物扫描电镜研究   总被引：2，自引：0，他引：2  

张杰  孙传敏  张宝贵  杨恩林 《矿物学报》2007,27(3):505-510

贵州兴仁滥木厂汞、铊矿床，矿体主要产出于上二叠龙潭组和长兴组泥岩、灰岩、泥质灰岩、硅质岩、煤岩和碳质页岩等混杂岩系。利用扫描电子显微镜及能谱分析等研究手段，对该矿床的物质组成、矿物成分特征及微观特征进行了探讨，为成矿元素汞、铊的赋存状态，生物成矿特征研究等提供矿物学资料。  相似文献