Single-Layer Buckle Folding in Non-Linear Fluids and Rocks

岩石的褶皱现象非常普遍，但人们对它的了解还不够充分。非常缓慢的自然应变速率和大应变在极长时间内的发展使得直接的实验室建模是不可能的。理论处理只能充分说明折叠的初始阶段。本研究将尝试通过适当选择本构关系的二维有限元模型来研究褶皱随时间的发展，从而规避这些问题。然后，由模型得出的形状和应变分布预测将与自然褶皱的数据进行比较。其目的是为从自然褶皱中获得关于变形历史和在缓慢自然条件下变形的岩石流变学的信息提供标准。

Folding in rocks is very common, yet is still imperfectly understood. Very slow natural strain rates and development of large strains over extremely long times make direct laboratory modeling impossible. Theoretical treatment only adequately account for initial stages of folding. This research will attempt to circumvent these problems by using a two-dimensional finite- element model with appropriate choice of constitutive relation- ships to study development of folds with time. Predictions of shape and strain distribution resulting from the model will then be compared with data on natural folds. The aim is to provide criteria for gaining information from natural folds about deformational history and about rheology of rocks deformed under slow natural conditions.