共查询到20条相似文献，搜索用时 547 毫秒
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本文运用系统论的观点，对瓮安丁家源地岩溶地下水系统微观及宏观结构的组合形式及空间分布规律，地下水流场，动态与均衡进行了系统分析，对岩溶地下水系统进行了条件概化，建立了水文地质概念模型及数值模型，对岩溶地下水系统的转换功能特征进行了分析探讨，在系统分析的基础上，进行了子系统的划分，并对丁家寨－白水河子系统及草塘子系统的Ｆ４边界进行了分析讨论，提出了系统局部分水岭及Ｆ４不确定边界预报处理方法存在某些问 相似文献
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青海拉脊山造山带早古生代火山岩 总被引：8，自引：0，他引：8
作者对青海拉脊山造山带早古生代火山岩的时空分布进行了简介，对火山岩的系列、类型、名称、组合进行了确定，对火山岩产出的构造环境及演化过程进行了分析，对开合作用的距离、时间、速度进行了估算，对蛇绿岩套特点与古幔事件进行了讨论，对火山岩岩浆的来源及演化进行了探索。 相似文献
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以密云水库北部地区为例，对遥感技术在土壤侵蚀调查中的应用进行了阐述。在调查中，首先利用遥感图像进行判读并进行实地验证。然后，根据影响土壤侵蚀的生态环境因子，建立了数学评判模型，对该区的土壤侵蚀情况进行了评判。这为该区的水土保持规划、管理和决策提供了科学依据。 相似文献
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山东省第二轮区域地质调查主要进展 总被引：5，自引：0，他引：5
山东省第二轮区调工作始于70年代末，完成了1：20万填图面积112326km^2和1：5万填图面积63137km^2，基础地质研究取得巨大进展：地层方面，建立了一些新的岩石地层单位，重新厚定了地层层序，进行了以岩石地层为主的地层多重划分对比，对各时代地层的沉积作用进行了探讨；侵入岩方面，初步完成了我省侵入岩岩石谱系单位的统一划分工作，研究了侵入岩的演化，成因、侵位机制和形成时代，尤其是从前寒武纪基底中识别出大量变形变质或未变形变质侵入岩，并对其进行了岩石谱系单位划分；变质岩方面，分析了原岩建造及形成环境，划分了变质岩系的变质相，变质相系和叠加变质作用，测定了大量pT数据，确定了一些变质岩的PTt轨迹，对变质作用类型进行了研究，发现了高压，超高压变质带并对其进行了探讨；构造方面，发现了研究了大量韧性变形带，对胶南－威海造山带7和郯庐断裂带进行了深入研究，矿产方面，主要是对各种矿产的成因和形成规律进行了探讨。 相似文献
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云南大姚凹地苴铜矿床数学模型的建立 总被引：1，自引：0，他引：1
大姚铜矿是我国重要铜矿山，对该矿床的最大矿体之一Ⅱ-1号矿体进行了研究，在地质规律研究的基础上，收集了与该矿体相关的铜、银品位数据，建立原始资料数据库，并对所收集的数据进行了可靠性讨论；对9061件铜样品和4160件银样品进行了统计分析，结果表明，铜、银品位服从对数正态分布；铜、银共生相关关系，为弱相关关系，需要分别建立其数学模型。计算了铜、银走向、倾向、厚度方向及平均实验变异函数，并进行了理论拟合和验证，结合矿体的地质特征对获得的参数进行了讨论。 相似文献
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大河口滑坡坏了铁路沿线设施和附近的建筑，为保证铁路的安全运营，必须立即进行整治，本文通过滑坡区的地形地貌，地质环境，对大河口滑坡的特征进行了分析，同时对滑坡整治措施及施工情况进行了回顾。 相似文献
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文章对扬子电厂粉煤灰的物质成分进行了研究，采用选矿联合工艺流程进行分选，并对所获得的系列产品开发应用前景进行了详细的探讨，论述了粉煤灰高层次产品的开发利用，在技术上可行，工业应用广泛，市场潜力大，经济效益显著。为粉煤灰的产品的深加工了新途径。 相似文献
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本钢郑家屯潜水含水层弥散试验研究 总被引：3，自引：0，他引：3
在本钢郑家屯潜水含水层中进行了弥散试验，以Ｃｌ＾－为示踪剂，瞬时投放，根据流场条件，建立了二维水质运移模型。利用标准曲线法进行处理，得到了各监测井处的弥散度，对该试验结果进行分析，得到了在试验范围内，多孔介质中水动力弥散度的变化。 相似文献
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Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
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Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
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Chronological analyses of correlations between certain global repeating events (mass extinctions of marine organisms, meteorite impacts, and flashes in the frequency of geomagnetic reversals) during the Phanerozoic Eon and the motion of the solar system in the Galaxy are presented for five rotationally symmetrical models for the regular Galactic gravitational field. Thirteen of sixteen mass-extinction events can be described by a repetition interval of 183±3 million years. This is in agreement with the anomalistic period (interval between two subsequent passages of the Sun through the apocenter of its Galactic orbit) in the model of Allen and Martos. The positions of the minima and maxima in Gaussian functions approximating the frequency distribution for geomagnetic reversals also agree with the times of passage of the Sun through the apocenter and pericenter, respectively, of its Galactic orbit in this model. The maximum in the distribution of the deviations of the dates of mass extinctions from the nearest dates of impacts of large, crater-forming bodies is close to zero, providing evidence that many such events are correlated. As a rule, extinctions follow impact events. The impacts of large bodies have occurred most often when the solar system passes through the Galactic plane, while mass extinctions occur more often at some distance from the Galactic plane (about 40 pc). As a rule, intervals of increases in the frequency of geomagnetic reversals coincide with dates of impacts of large bodies. At the same time, these intervals do not show a clear correlation with the dates of mass extinctions. The intensity of mass extinctions, like the energy released by impacts, is consistently higher in periods when the Sun is moving from the apocenter toward the pericenter of its orbit, than when it is moving from the pericenter toward the apocenter. Thus, there is evidence for a variety of relationships between repeating global events in the Phanerozoic and the motion of the Sun in the Galaxy. Long-period variations in the frequency of geomagnetic reversals are correlated with the orbital motion of the Sun, and increases in the frequency of geomagnetic reversals are correlated with impacts. Mass extinctions are correlated with the impacts of large bodies, whose motions may have been perturbed by clouds of interstellar material concentrated toward the Galactic plane and by the shock front associated with the Perseus spiral arm, through which the solar system passes. The velocity of the Sun relative to the spiral pattern is estimated. 相似文献
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摩擦桩基桩土间极限摩阻力取值问题探讨 总被引：1，自引：0，他引：1
通过对广珠东线高速公路横沥大桥的试桩及土体的工程地质条件分析,总结出影响摩擦桩基桩土间极限摩阻力取值的一般问题以及解决问题的方法和措施。 相似文献
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位于华北和扬子两板块碰撞带中的苏鲁榴辉岩形成的温压条件不但是超高压，而且是高温。榴辉岩的PTt轨迹表明其为陆-陆磁撞俯冲带的产物。榴辉岩的区域性围岩花岗质片麻岩为新元古代同碰撞期花岗岩，榴辉岩及其他直接围岩皆呈包体存在于其中，并见新元古代花岗岩呈脉状侵入榴辉岩包体中。区域性围岩新元古代花岗岩的锆石中发现有柯石英、绿辉石等包裹体，表明新元古代花岗岩的组成物质也经受过超高压变质作用，且榴辉岩与围岩新元古代花岗岩的锆石U-Pb体系同位素年龄基本相同。但新元古代花岗岩所记录的变质作用和变形作用期次（或阶段）却少于榴辉岩。椐上述可得如下推断：超高压榴辉岩与新元古代花岗岩岩浆是同时在碰撞带底部（俯冲板块前部）形成的；榴辉岩的第一折返阶段是由新元古代花岗岩岩浆携带上升的，其第二折返阶段是和新元古代花岗岩一起由逆冲及区域性隆起而上升，遭受剥蚀。 相似文献
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某高速公路下伏煤矿采空区稳定性分析 总被引：10，自引：0，他引：10
在论述某高速公路下伏砦脖煤矿采空区地质、采矿和工程地质特征的基础上, 进行了稳定性数值模拟分析, 定性与定量地分析与评价了该煤矿采空区的地表变形特征及稳定性。研究结果表明: 该煤矿采空区的变形尚未完成, 对拟建的高速公路将产生很大的危害, 必须采取相应的工程治理措施。 相似文献
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The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning. 相似文献
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The structure of the eastern Pyrenees consists mainly of south-directed thrusts involving basement and cover rocks. An antiformal stack developed by the piling up of basement thrust sheets which outcrop in the Axial zone. These structures account for a thin-skinned thrust model rather than a vertical fault model in which the Axial zone would be essentially autochthonous, and the North-Pyrenean fault the axial plane of a fan thrust system. New data from the Eastern Pyrenees and the thin-skinned model suggest that(1) the structure east of the Pedraforca nappe is similar to that of the Central Pyrenees; (2) the cover rocks of the South-Pyrenean units and of the Axial zone-after restoration—built up a northwards-thickening prism consistent with the existence of a unique Pyrenean sedimentary basin during Mesozoic time; (3) the Axial zone is only a complex antiformal stack developed as a part of South-Pyrenean system related to the Paleogene thrusting-tectonics. The Axial zone palaeogeographic area had no special meaning during Mesozoic time. 相似文献