断陷盆地K型同沉积构造的理论和实验研究

THEORETICAL AND EXPERIMENTAL STUDY OF K-SHAPED SYNSEDIMENTARY STRUCTURE IN FAULT BASINS

断陷盆地中 K 型同沉积构造是一种新提出的地质构造形式,该理论对找煤与煤田勘探具有重要意义。本文应用弹性大挠度板稳定理论和非线性有限元方法,对其力学模型做了理论分析和数值计算。同时还做了 K 型构造的实验研究,数值分析与实验研究的结果均与实际情况吻合较好,表明所做的模型假设是合理的。从而对 K 型构造形成的机理在力学上给出了恰当的解释。

K-shaped synsedimentary structure in fault basins is a new type of geological structure so far presented.It is of significance in coal searching and exploration.In this paper,a theoretical analysis and numerical calcul- ation of the mechanicl model of such a structural type has been made by analysing the stability of an elastic plate in large deflection applying nonlinear finite element method.An experimental study of the structure has also been conducted.The results are in good agreement with the natural type observed.The proposed model thus gives a reasonable explanation to the mechanism of the formation of the structural type.