长江科学院院报2018，Vol.35Issue(3)：159-163,5.DOI:10.11988/ckyyb.20171172
基于结构面几何参数的深部隧洞围岩破坏机理研究
Failure Mechanism of Surrounding Rock of Deep Tunnel in Consideration of Varying Geometric Parameters of Structural Planes
摘要
Abstract
The strength of rock mass is controlled by structural plane. On the basis of theoretical analysis on stress distribution and failure mechanism of single structural plane in surrounding rock, the influences of dip angle of structural plane and distance from structural plane to tunnel center on the failure mechanism of jointed rock mass are researched. The results are concluded as follows: 1) discontinuities are more likely to occur when structural plane is closer to the excavation contour line;2) the position where structural plane first destructs is affected by the angle of structural plane. Furthermore,the deformation of 18 groups of rock masses with different combinations of discontinuity distribution,rock strength and discontinuity strength are calculated and compared in three-dimensional element code(3DEC),and the failure mechanisms of surrounding rock with various discontinuities distribution are analyzed. The contribution of structural plane' s mechanical properties to rock failure is also studied: the distribution of structural plane determines the location of the first failure;and the failure of structural plane does not necessarily lead to the failure of surrounding rock.关键词
深部隧洞/节理围岩/结构面/几何参数/离散元/破坏机理Key words
deep tunnel/jointed surrounding rock/discontinuities/geometric parameters/discrete element/failure mechanism分类
建筑与水利引用本文复制引用
王克忠,吴慧,马菲..基于结构面几何参数的深部隧洞围岩破坏机理研究[J].长江科学院院报,2018,35(3):159-163,5.基金项目
国家自然科学基金项目(51679215) （51679215）
