摘要
以地球系统科学为研究思路 ,研究了青藏高原山地系统各圈层相互作用的统一构造动力模型、力学模型和数值模拟等。关于青藏高原山地系统动力学特征 ,主要研究高原山地系统现今构造应力场演化特征和高原山地系统统一构造动力模型 ,认为均起源于喜马拉雅运动期印度 -欧亚板块碰撞引发的统一的板块汇聚动力体系和各圈层与之相应的一系列运动学和动力学过程。关于青藏高原山地各圈层力学系统描述 ,主要把山地各圈层块体质点作为一个力学系统来描述 ,求解速度向量、位移向量、密度场、温度场、应力张量等物理量和状态空间 ,最后求解运动方程。关于青藏高原山地系统的非稳定性问题 ,将给定的载荷历史分成许多小的增量步 ,对每一个增量步求解一个非线性边值问题。使用失稳量准则判断山地系统的稳定性。关于青藏高原山地各圈层多体系统力学描述 ,青藏高原是由多圈层多块体不同物质结构组成的 ,皆可用若干塑性、流变体、流体和弹性组成的系统模型予以有效地描述。主要研究内容有 :高原山地系统碰撞隆升的分类和现象、山地主动碰撞构造体特性和山地被动碰撞体 (靶体 )特性等力学模型。文中初步分析和推断了演变的历史与现状 。
Since millions years, the formation of mountain system of Tibet plateau, which is the region of indoplate collision to Eurasia since 45 million years, is one of the most important events of the Earth history. It becomes known tothe world for its unique geology, geography and complex lithosphere structure. After decades of years research, study about Tibet plateau has turned to theme study and systematic theory. At the same time, the study now has surpassed imaginal thinking and come to abstract thinking phase. The uplifting of Tibet plateau is the result of ioter spherical dynamic acting and its effects. According to the idea of earth system science, the paper studied on the overall dynamic model, mechanical model and numerical simulation of unified inter spherical acting of mountain system of Tibet plateau, based on author's researches and other data of geology, geography, geophysics and geochemistry etc. 1 Dynamic characteristics of mountain system of Tibet plateau The paper mainly studies the evolutional characteristics of structure stress field and unified structure dynamic model of mountain system of Tibet plateau. And thinking that all these dynamic geology processes are resulted from the indoplate collision to Eurasia during the movement of Himalayas. 2 Presentation of spherical mechanical system of Tibet plateau The multi spherical blocks can be simulated as a mechanical system, and velocity vector, displacement vector, density field, temperature field, stress field can be resolved, finally a movement equation can be resolved. 3 Non stability of mountain system of Tibet plateau In this paper, the history of given load is divided into many incremental steps, and for each incremental step, it is equal to the solution to one non linear marginal problem. The stability of mountain system can be determined by using the quantitative criteria of non stability. 4 Presentation of multi body collision mechanics of mountain system of Tibet plateau Tibet plateau is composed of multi spherical and multi body substances and can be stated effectively by using some plastic, fluid, elastic system models. The paper studies the phenomenon and classification of uplifting of plateau mountain system, the active collision mechanical model of mountain. And from this, its evolution history and status quo are analyzed and inferred. Finally, the mechanical process of uplifting of Tibet plateau is discussed.
出处
《山地学报》
CSCD
2001年第3期193-200,共8页
Mountain Research
基金
中国博士后科学基金一等资助
