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The conspicuous curved structures located at the eastern front of the Eastern Cordillera between 25° and 26° south latitude is coincident with the salient recognized as the El Crestón arc. Major oblique strike-slip faults associated with these strongly curved structures were interpreted as lateral ramps of an eastward displaced thrust sheet. The displacement along these oblique lateral ramps generated the local N–S stress components responsible for the complex hanging wall deformation. Accompanying each lateral ramp, there are two belts of strong oblique fault and folding: the upper Juramento River valley area and El Brete area.On both margins of the Juramento River upper valley, there is extensive map-scale evidence of complex deformation above an oblique ramp. The N–S striking folds originated during Pliocene Andean orogeny were subsequently or simultaneously folded by E–W oriented folds. The lateral ramps delimiting the thrust sheet coincident with the El Crestón arc salient are strike-slip faults emplaced in the abrupt transitions between thick strata forming the salient and thin strata outside of it. El Crestón arc is a salient related to the pre-deformational Cretaceous rift geometry, which developed over a portion of this basin (Metán depocenter) that was initially thicker. The displacement along the northern lateral ramp is sinistral, whereas it is dextral in the southern ramp. The southern end of the Eastern Cordillera of Argentina shows a particular structure reflecting a pronounced along strike variations related to the pre-deformational sedimentary thickness of the Cretaceous basin. 相似文献
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通过对遥感图像解译中传统的几何位置校正方法的研究,提出了一种曲面样条函数算法,从而能解决传统的方法校正不完全的缺陷。 相似文献
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根据瞬变电磁场扩散方程与波动方程间存在的数学对应形式,将已知瞬变电磁场数据转换为虚拟波场数据,在此基础上,提出了用克希霍夫积分法将所转换的波场从地面向地下反向延拓的方法.在延拓的数值计算中,为提高计算效率,采用三维边界元技术,把边界积分分解为诸三角单元积分的积分之和, 建立了曲面延拓方程式;通过地面测点的波场值,求出地下某一点的波场值,实现了地表为曲面的向下延拓成像计算.通过对理论模型计算和实际资料处理,证明了该方法可以增强瞬变电磁法识别地下电性分界面的能力,使瞬变电磁法对地下目标体的三维精细探测成为可能. 相似文献
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The need to assess the structural capability of curved marine composite structures that support the keel of high performance yachts has increased due to the rise in the number of accidents and human casualties. The top hat stiffener is the basic structural member of the yacht to sustain the tensile and bending load of the keel. This paper characterises the mechanical strength of E-glass/vinylester composite top hat stiffeners subjected to transverse loading. The out-of-plane load transfer was studied and failure modes were identified for the three different composite layups which were tested to failure. Experimental results obtained from mechanical testing were compared with FEA predictions, based on the quadratic interlaminar stress criterion. Secondary reserve strength from the unidirectional fibres was identified and the potential to use this secondary strength was further investigated. 相似文献
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根据等效原理及理论自洽的要求，把光速不变原理推广到弯曲时空。并在此基础上阐明了坐标、坐标变换，物理量的描述与测量等最基本问题的物理意义。 相似文献
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Jian-Fei Lu Dong-Sheng Jeng Tsung-Lin Lee 《Soil Dynamics and Earthquake Engineering》2007,27(9):875-891
Recently, considerable efforts have been devoted to evaluation of seismic dynamic response of a circular tunnel. Conventional approaches have considered integral liners embedded in an elastic medium. In this study, we re-examine the problem with piecewise liners embedded in a porous medium. Surrounding saturated porous medium of tunnels is described by Biot's poroelastic theory, while the liner pieces and the connecting joints are treated as curved beams and characterized by curved beam theories. The scattered wave field in the porous medium is obtained by the wave function expansion method. The differential equations governing the vibration of a curved beam is discretized by the General Differential Quadrature (GDQ) method. The domain decomposition method is used to establish the global discrete dynamic equations for the piecewise tunnel. The surrounding soil and the tunnel are coupled together via the stress and the displacement continuation conditions which are implemented by the boundary collocation method. Numerical results demonstrate that the stiffness difference between the liner piece and the connecting joints has a considerable influence on the internal forces of the liner piece. 相似文献
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通过“面拟合物理蛳诊断和三维图形显示系统”获得适合华东区域使用的多种物理量咕维图形，摸索用立体图形制作天然气预报的着眼点，初步分析表明物理量立体图是有非常广阔应用前景的工具之一。 相似文献
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地震波的散射与盆地的场地效应 总被引：3，自引：0，他引：3
根据射线理论对二维盆地型试场地与Ｐ波波列特征的关系，波列中震相的性质及其产生的原因等进行了研究，对决定震相振幅大小的散射系数，几何扩散和波阻抗３个因子等的研究表明，因界面弯曲引起的广角反射和聚焦分别Ｐ波波阵中出现大能量团的第一和第二位的重要因素，在层内纵，横波波速比和层间波速比大范围变动的条件下，对界面散射系数的计算表明，介质内界面上Ｐ到Ｓ的反射转换波是指示界面两侧速度反差强弱以及入射波所在介质层 相似文献