基于3DEC的节理岩体边坡地震影响下的楔体稳定性分析  

WEDGE STABILITY ANALYSIS OF JOINTED ROCKMASS SLOPE CONSIDERING SEISMIC INFLUENCES BASED ON 3DEC

作　　者：周家文[1] 徐卫亚[1] 石崇[1] 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098

出　　处：《岩石力学与工程学报》2007年第A01期3402-3409,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2002CB412707);国家自然科学基金重点项目(50539110)

摘　　要：首先,对于地震影响下节理岩体边坡的楔体滑动破坏,给出不同情况下楔体滑动安全系数的计算公式;然后,分析滑面上法向力作用点位置变化的距离li和楔体的安全系数与剪切力和水平面的夹角βi,水平地震力系数kh和竖向地震力系数和水平地震力系数的比值λ之间的关系。分析结果表明,li随着βi和kh的增大而增大,但随着λ的增大而减小;楔体的安全系数随着βi和k h的增大而减小,但在同样大小的水平地震力系数下,随着λ的增大而增大。最后,分析考虑地震影响下楔体安全系数计算在3DEC中的实现过程,并且给出计算过程中的2个重要步骤:确定空间三角形的面积和四面体的体积以及确定两节理面的交线矢量。最后,通过实例分析,说明该理论分析的正确性及合理性。According to the wedge sliding failure of jointed rockmass slope under seismic loadingt,he safety factor calculation formulae of wedge sliding are given under different conditions,and the relationships among distance li of normal stress action point,the safety factor of wedge sliding and the angle of shear stress and horizontal plane β i,horizontal seismic factor kh,the ratio of vertical seismic factor and horizontal seismic factor λ are analyzed.Its shows that,li increases with β i,k h increasing,but decreases with λ increasing;at the same condition of horizontal seismic loadingt,he safety factor of wedge decreases with βi,k h increasing,but increases with λ increasing.Then the computation processes of the wedge sliding safety factor considering seismic influences in 3DEC are carried out,and two important steps in the compute process are givent：he determination of the area of triangle,the volume of tetrahedron in 3D and the intersect line vector of two joint faces.Finally,an example is presented to explain the rationality of theoretical analysis.

关 键 词：岩石力学 节理岩体 边坡 楔体滑动 稳定性分析 

分 类 号：TU457[建筑科学—岩土工程]