云冈双窟窟室围岩变形分析

双窟是云冈石窟中最具历史与艺术价值的对称性洞窟形式。以典型双窟第9~10窟为对象建立有限差分模型,利用实测力学参数进行数值分析以研究静况下窟室围岩受力变形情况。结果表明双窟整体受压-局部受剪:窟间隔墙、室间隔墙底部和列柱中上部受压最大,达1.20~1.57 MPa;室间隔墙上部及柱顶受剪作用达0.1~0.3 MPa。模型塑性应变为零,说明目前工况下双窟整体结构未受破坏。切片y=20 m的位移矢量云图显示后室窟顶沉降值达1.1 mm,前后室地面有相对隆起,应重视其变形趋势。

Research on Stress and Deformation of Cave Chambers in Yungang Double-cave

The double-cave is the symmetrical caves of the most historical and artistic value in Yunang Grottoes. Take typical double-cave of 9_th -10_th to build finite difference model, utilize the measured mechanical parameters for numerical analysis to study stress and deformation of chamber sorrouding rock under static condition. Results show that the double-cave endure pressure stress and local shear stress: the large pressure stress is in the bottom of partition wall between caves and between chambers as well as the upper of column for 1.20-1.57 MPa, the large shear stress is in the upper of partition and the top of column for 0.1-0.3 MPa. No plastic strain shows that the double-cave structure is unbroken under current condition. The displacement-vectoer nephogram of Slice(y=20m) shows the maximum settlement on the top of the main chamber for 1.1mm, the groud of the front and the main chamber have relative uplift, it should pay attention to.