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断裂构造及活动强度对斜坡体的应力场分布具有重要的影响。采用基于强度折减法的有限元法,分别以正断层和逆断层与斜坡体的组合关系为例,剖析了断裂构造对斜坡体应力场的影响及成灾机理,揭示了含有断层的斜坡体塑性区的贯通过程。研究表明,包含断层的斜坡体在应力分布特征及斜坡变形破坏机理方面与无断层的斜坡体有较大差别:含断层的斜坡体在坡面和断层面附近的最大主应力迹线与坡面或断层面相平行,在天然状态下,塑性区同时出现在坡脚和断层面后方,随着折减系数的增大,塑性区分别从坡脚和断层面后方向坡体深部和上部发展,直至断层面前后两个塑性区相贯通,坡体发生破坏,并且对坡体变形破坏的影响程度以逆断层最强,其次为正断层,断层不活动时较弱。
The fault structure and activity intensity have an important influence on the stress field distribution of slope body. Using the finite element method based on strength reduction method, taking the combination of normal fault and reverse fault and slope body as an example, the influence of fault structure on the stress field of slope body and the disaster mechanism are analyzed respectively. The plasticity of slopes with faults District through process. The results show that the slope body with fault has great difference from the slopeless body in stress distribution and slope deformation and failure mechanism. The maximum principal stress trace and slope surface near fault surface and fault plane In the natural state, the plastic zone also appears at the foot of the slope and behind the fault plane. With the increase of the reduction coefficient, the plastic zone develops from the bottom of the slope and the back of the fault plane to the top and bottom of the slope, respectively Before and after the fault plane, the two plastic zones interpenetrate, and the slope body is damaged. The influence degree of deformation on the slope body is the strongest in the reverse fault, the second is the normal fault and the fault is not active.