摘要
采用三维多层壳结构单元,用有限元法计算了青藏高原岩石圈在地形载荷下的挠曲变形;并基于地震波速度模型和莫霍面深度约束模型所得到的高原岩石圈分层的力学模型,就高原整体、东部及西部块体的热物质低速层对高原岩石圈强度的影响进行了研究。计算结果表明,热物质低速层对整个东、西块体地壳强度有着不同程度的影响,它对东部区域的影响比西部大。
The downward deflection of the Qinghai-Tibet lithosphere due to the topographical load is calculated with finite element method by use of the 3D muhilayered shell structural unit. Then, the influence of the lower-velocity layer of thermokarst on the intensity of the Qinghai-Tibet lithosphere in different regions is studied with multilayered mechanical model, based on the seismic-wave velocity structural model and the constrained Moho model. The results show that the lower-velocity layer of thermokarst has a stronger influence on the lithosphere in the eastern region of the Qinghai-Tibet plateau than that in the western region.
出处
《大地测量与地球动力学》
CSCD
北大核心
2007年第2期25-31,共7页
Journal of Geodesy and Geodynamics
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-125)
国家自然科学基金(40574033)
关键词
青藏高原
岩石圈
有限元法
挠曲
低速层
Qinghai-Tibet plateau, lithosphere, FEM （ Finte Element Method）, flexure, lower-velocity layer
