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   

地下水出流单断沙关系的回归分析     

马丽英 《水文》2007,27(4):59-62,79

阐述回归分析理论，根据南洞1：1站8年的实测输沙率成果资料作回归分析。从而了解和认识地下水出流的泥沙在横向和垂向上的分布规律及各垂线单沙与断沙之间的相关系数、回归效果、回归误差的多少。掌握泥沙的变化规律，对该地区的工、农业用水，城市用水，水资源的合理化利用和保护有着十分重要的意义。  相似文献   

基于断面基准面点云模型的隧道管片分割与断面提取     

余建伟  廖江海  陈智鹏  熊永钢  熊智敏 《测绘通报》2021,(10):159-162

隧道变形的精确测量对于掌握隧道衬砌结构的变化及其发展规律、保障隧道的安全运行具有重要意义。本文首先借助轨载移动三维激光测量系统获取地铁隧道的激光点云,结合隧道呈柱面的几何特点,提出一种基于断面基准面投影的盾构隧道点云模型构造方法;然后利用断面基准面点云的高度梯度与三维特征分割隧道管环并提取隧道断面,从而获取盾构隧道的连续横断面,为隧道变形监测提供基础。  相似文献   

平衡计分卡在地质勘查单位管理工作中应用的探讨          下载免费PDF全文

向桂芬 《甘肃地质》2022,(1):88-93

本文通过对平衡计分卡原理及战略地图的介绍,重点阐述地质勘查单位在管理工作中如何创新构建平衡计分卡,并对地质勘查单位管理工作中应用平衡计分卡的作用进行了分析,旨在提高地质勘查单位管理工作水平,促进地质工作高质量发展,推动生态文明建设。  相似文献   

A Structural Interpretation Model and Restoration of the Mesozoic Proto-basin for the Kuqa Depression, Tarim Basin     

QI Jiafu  LI Yong  XU Zhenping  YANG Shujiang  SUN Tong 《《地质学报》英文版》2023,97(1):207-225

A thrust-fold belt consisting of a series of thrusts and buckling folds developed in the Mesozoic and Cenozoic strata within the Kuqa Depression, Tarim Basin. In this study, a structural interpretation model of the Kuqa Depression is established and the Mesozoic proto-basin is reconstructed on the basis of outcrop geology along the basin margin, seismic,well-log and CEMP data. The model is called ‘delaminate contractional deformation’, which emphasizes the decoupling between the Cenozoic, Mesozo...  相似文献