• ISSN 2097-1893
    • CN 10-1855/P

    超重力构造物理模拟研究综述

    A review of hypergravity structural analog modeling

    • 摘要: 地球构造演化涉及宏大时空尺度,直接观测其动力学机制面临根本性挑战. 构造物理模拟实验通过构建满足相似性原理的缩比模型,为实验室定量解析构造过程提供了关键手段. 然而,传统常重力模拟受限于模型自重应力不足与材料强度畸变,难以真实复现深部地质环境中的应力状态及长期演化. 超重力构造物理模拟应运而生. 该方法利用离心机产生的高倍重力场,在缩尺模型中实现与自然原型的应力等效,并利用“缩时效应”显著加速缓慢的地质流动过程. 本文系统综述了该方法的发展与应用. 首先,阐述相似性理论及常重力实验的固有局限;进而,重点解析超重力实验通过增强体力场,支持采用更高强度、更宽流变谱的材料,构建更为逼真的模型,并实现非破坏性连续观测实验. 本文详细梳理了超重力技术在板块俯冲起始、褶皱-冲断带形成、区域伸展构造、以及膏盐/岩浆底辟等构造领域的应用案例. 展示了其在揭示低角度俯冲机制、拆离断层演化、盐构造驱动以及深部韧性流动等方面的独特见解. 相较于常重力模拟,其核心优势在于应力场精确匹配、实验时间的有效压缩、宽流变差异材料的兼容使用,以及变形过程的定量刻画. 尽管超重力模拟已在鼓式离心机上取得丰硕成果,但臂式离心机大尺寸模型的潜力仍待挖掘. 展望未来,该技术与粒子图像测速、数字图像相关、X射线计算机断层扫描等观测手段的深度融合,将极大提升数据维度与空间分辨率. 超重力构造物理模拟将持续为板块相互作用、造山带三维演化及深部物质循环等重大前沿地质问题提供不可替代的实验约束,持续推动地球动力学理论的创新发展.

       

      Abstract: The Earth’s tectonic evolution involves immense spatial and temporal scales, posing fundamental challenges for direct observation of its dynamic mechanisms. Analog modeling of tectonic processes provides a key approach for quantitative analysis in the laboratory by constructing scaled models that satisfy similarity principles. However, conventional normal-gravity analog modeling is limited by insufficient self-weight stress of the model and scale effects of material strength, making it difficult to faithfully reproduce the stress state and long-term evolution of deep geological environments. Hypergravity tectonic analog modeling has emerged as a solution to these limitations. By using a centrifuge to generate a high-gravity field, this method achieves stress equivalence between the scaled model and the natural prototype, while the “time-scaling effect” significantly accelerates slow geological flow processes. This paper systematically reviews the development and application of hypergravity analog modeling. It first outlines the similarity theory and the inherent limitations of normal-gravity experiments. It then focuses on the core principles of hypergravity experiments: by increasing the body force field, it becomes possible to use materials with higher strength and a wider rheological spectrum, thereby constructing more realistic models and enabling non-destructive, successive observations of progressive deformation. The article reviews in detail the application of hypergravity technology in key tectonic fields, including plate subduction initiation, fold-and-thrust belt formation, regional extensional tectonics, and evaporite/magmatic diapirism. It highlights unique insights gained from hypergravity simulations that are difficult to obtain from normal-gravity experiments, such as the rotation mechanism of low-angle subduction, the evolution of detachment faults, the driving mechanisms of salt tectonics, and the behavior of deep ductile flow. Compared with normal-gravity simulations, the core advantages of hypergravity modeling are: accurate matching of the stress field, effective compression of experimental time, compatibility with materials having widely varying rheological properties, and detailed quantitative characterization of deformation processes. Although hypergravity simulations have achieved substantial results using drum centrifuges, the potential of large-scale models in beam centrifuges remains to be further explored. Looking forward, the deep integration of hypergravity technology with modern observation techniques such as Particle Image Velocimetry (PIV), Digital Image Correlation (DIC), and X-ray Computed Tomography (CT) will greatly enhance the spatial resolution and quantitative analysis dimensions of experimental data. Hypergravity tectonic analog modeling will continue to provide irreplaceable experimental constraints on major frontier geological problems, including plate interaction, three-dimensional evolution of orogenic belts, and deep material cycling, thereby driving innovation in geodynamic theory.

       

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