造山动力学定量研究——理论与方法

doi:10.11867/j.issn.1001-8166.2005.05.0533

造山动力学定量研究近10年来取得了重要进展，形成了较完整的理论技术体系，并获得了大量有说服力的实例分析结果，成为当前大陆变形研究的热点之一。造山动力学定量研究采用数值方法求解控制方程，获得造山带演化动态过程的图像，了解不同因素对该过程的影响作用，从力学解析的角度确定造山动力学模型的合理性。研究造山演化过程需要耦合固体力学、流体力学和热力学方程进行描述。造山演化过程中发生的强烈大位移、大应变（几何非线性）使得数值求解过程更复杂。对于强烈大应变可能需要采用重分网格技术。断裂的发生、运动与变形涉及岩石破裂准则与内部边界处理。同时，还必须综合分析地表剥蚀与沉积、重力均衡等作用。

关键词: 动力学, 数值模拟, 非线性, 耦合, 造山

In the last decade, great advances have been made on the numerical simulation of the orogenic dynamics. Not only an integrated theory has been built up, but also many convincing results were obtained from the concrete example analysis. The quantitative study of the orogenic dynamics has been a hot research point of the continental deformation. In the quantitative study of the orogenic dynamics a series of control equations need to be solved by means of the numerical technique. The results will provide the image of the orogenic dynamic evolution. This makes it possible to understand the role of different factors in the orogenic process and to identify the acceptability of an orogenic model from the mechanical analysis. The investigation of the orogenic evolution requires an equation system integrated from the solid-mechanics and fluid-mechanics as well as the thermodynamics. The intensive largedisplacement and large-strain taking place in the orogenic evolution make the numerical simulation more complicated. The re-meshing technique becomes necessary in this case. The criterion of rock failure and inner boundary condition need to be considered carefully while processing the fault growth, movement and deformation. In addition, the surface erosion and sediment as well as the isostatic compensation must be considered comprehensively in the orogenic simulation.

Key words: Orogen, Dynamics, Numerical simulation, Nonlinear, Couple.

中图分类号:

P542

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摘要

A QUANTITATIVE STUDY OF THE OROGENIC DYNAMICS THEORY AND APPROACH