逆冲推覆构造最新研究进展评述   总被引：7，自引：0，他引：7  

张开均  施央申 《地质与勘探》1996,32(2):23-28

逆冲推覆构造最新研究进展包括以下４个方面：１．创立新型逆冲推覆构造几何体系，其主要构造要素为台阶式逆冲断层，强调断裂与褶皱的相互关联性，可划分为断裂与褶皱两个分支系统。２．发展平衡构造剖面的研究方法，用于计算造山缩短量并检验构造解释。３．发现韧性推覆产生糜梭岩、混合岩、花岗岩三位一体的成岩作用和对金矿床的控制作用；清表推覆构造对油气藏的控制作用；浅表台阶式逆冲断层对金属矿藏的控制作用，这种控矿作用  相似文献   

Erratic shortening from balanced cross-sections of the western Himalayan foreland basin: causes and implications for basin evolution   总被引：1，自引：0，他引：1  

A. K. Dubey  R. Misra  S. S. Bhakuni 《Journal of Asian Earth Sciences》2001,19(6)

Balanced cross-sections from the western Himalayan foreland foothill belt reveal a variation in shortening amounts from 22 to 71.3% over a lateral distance of 85 km. The large variation may be attributed to the fact that the method of cross-section balancing considers the initial layering as horizontal, which is an unlikely situation in foreland basins. Simple trigonometric relationships are used to minimize the error in shortening estimates. However, the suggested corrections could not be applied to the Himalayan foreland basin because of unavailability of the required data on initial basin geometry. The study also indicates that shortening rates for the area based on these shortening amounts cannot be used for earthquake prediction.  相似文献   

利用实验资料检验扁椭球形雨滴和冰粒后向散射DDA算法   总被引：1，自引：2，他引：1  

许小永  王振会  王庆安  巢增明 《高原气象》2002,21(1):31-36

简要介绍了DDA法理论，并根据后向散射截面测量实验所选用的扁椭球形粒子，运用DDA法计算了它们在微波段，电磁波垂直于粒子旋转轴入射情况下的后向散射截面。经过对比，DDA法计算结果与实验测量资料一致性较好。同时评价了DDA算法计算的特点，分析了扁椭球雨滴和冰粒的后向散射特性并描述了实验测量技术。  相似文献   

确定隧道外水压力的地下水流模型--读<深埋隧道外水压力计算的解析-数值法>一文随笔   总被引：12，自引：0，他引：12  

陈崇希  刘文波  彭涛 《水文地质工程地质》2002,29(5):62-64

分析当前普遍使用的“折减系数法”确定隧道外水压力中存在的问题，建议采用地下水流数值模拟法，并提出建模中的注意事项，特别是边界条件的确定。  相似文献   

临界细沟水力几何形态问题的研究     

王协康  方铎 《山地学报》1997,(1)

从分析细沟床面上切应力出发，在细沟全断面泥沙处于临界起动条件下，导出了细沟临界断面方程并讨论其水力几何要素的变化，进一步提出用细沟密度去分析坡地的土壤侵蚀程度．  相似文献   

Subsidenz und tektonik des Saar-Nahe-Beckens (SW-Deutschland)     

Andreas Henk 《International Journal of Earth Sciences》1993,82(1):3-19

The Saar-Nahe-Basin in SW-Germany is one of the largest Permo-Carboniferous basins in the internal zone of the Variscides. Its evolution is closely related to movements along the Hunsrück Boundary Fault, which separates the Rhenohercynian and the Saxothuringian zones. Recent deep seismic surveys indicate that the Saar-Nahe-Basin formed in the hanging wall of a major detachment which soles out at lower crustal levels at about 16 km depth. Oblique extension along an inverted Variscan thrust resulted in the formation of a half-graben, within more than 8 km of entirely continental strata accumulated. The structural style within the basin is characterized by normal faults parallel to the basin axis and orthogonal transfer fault zones. Balanced cross-section construction and subsidence analysis indicate extension of the orogenically thickened lithosphere by 35%. Subsidence modeling shows discontinuous depth-dependent extension with laterally varying extension factors for crust and mantle lithosphere. Thus, the offset between maximum rift and thermal subsidence can be explained by a zone of mantle extension shifted laterally with respect to the zone of maximum crustal extension.

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兰坪金顶地区推覆－滑动构造及其平衡剖面     

覃功炯  彭斯震 《现代地质》1994,8(2):177-186

本文选择横切哀牢山隆起，经金沙江－红河大断裂，金顶铅锌矿区至澜苍江大断裂的剖面进行平衡．确认该剖面的构造样式为一喜马拉雅期的背负式对冲模式，即较老的Ｊ－Ｔ３地层分别从东西方向向兰坪盆地内部逆冲，可以分为东西两个推覆带．东推覆带发育较全，由根带、中带和前缘带组成．在推覆事件之后雪邦山隆起带迅速抬升，其西坡下有同生断裂活动，雪邦山隆起之上的推覆体转换成重力滑覆，由此形成了金顶矿区和莱龙、金－一带颇具特色的滑覆构造带．经平衡复位该剖面在以喜马拉雅构造期为主的阶段压缩了４３ｋｍ．本文为金顶起大型铅锌矿床形成的区域构造背景提供了新的认识．  相似文献   

Modelling Spatial Variability Along Drainage Networks with Geostatistics   总被引：1，自引：0，他引：1  

Jean-Stéphane Bailly  Pascal Monestiez  Philippe Lagacherie 《Mathematical Geology》2006,38(5):515-539

Local characteristics of drainage networks such as cross-section geometry and hydraulic roughness coefficient, influence surface water transfers and must be taken into account when assessing the impact of human activities on hydrological risks. However, as these characteristics have not been available till now through remote sensing or hydrological modelling, the only available methods are interpolation or simulation based on scarce data. In this paper we propose a statistical model based on geostatistics that allows us to take account of both the spatial distribution and spatial uncertainties. To do this, we modify the geostatistical framework to suit directed tree supports corresponding to drainage network structures. The stationarity concept is specified assuming conditional independence between parts of the network; variogram fitting and modelling are then modified accordingly. A sequential multi Gaussian simulation procedure going upstream along the network is proposed. We illustrate this approach by studying the width of an 11-km long artificial drainage network in the south of France.  相似文献   

隧道限界测量若干问题探讨     

郑书强 《中国煤田地质》2006,18(1):69-70

隧道的中线测量和限界（横断面）测量是非常重要的工作。本文结合隧道限界测量，探讨采用常规测量方法替代断面仪进行断面测量的的隧道断面的确定及精度。  相似文献   

变截面桩的力学性能及工程意义   总被引：5，自引：0，他引：5  

胡培进  汪中卫  李强  ZAI Jinzhang 《上海国土资源》2007,(3):27-31,58

通过对变截面桩的荷载传递性质及变形特性详细分析,指出其具有受力合理,沉降小等优点,并通过工程实例进行了验证。  相似文献