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通过使用RFPA(Rock Failure Process Analysis System)二维模拟软件,分别研究了断层相交角度θ、破碎带宽度、关键层强度、破碎带强度、埋深5个参数对X型正断层交汇处垂直和水平方向应力场分布的影响。研究表明,这些因素在不同范围内,都对断层交汇处地应力场的分布有不同程度的影响,且这些因素对垂直和水平两个方向的主应力影响程度并不是完全一致的。相交角度不同时,垂直应力可能表现为应力集中或应力降低,而水平应力只表现为应力降低;破碎带宽度不同时,垂直应力只表现为应力集中,而水平应力可能表现为应力集中或应力降低;破碎带强度越小对垂直应力的影响越大,而对水平应力的影响则呈线性关系;埋深较浅对垂直应力的影响较大,而随着埋深增加,埋深对水平应力的影响不变;关键层强度对垂直和水平方向应力的影响程度却极为相似。
By using RFPA (Rock Failure Process Analysis System) two-dimensional simulation software, the relationship between fault intersection angle θ, fracture zone width, key zone strength, crushing zone intensity and buried depth is studied respectively for vertical and horizontal X-normal fault intersections The influence of directional stress field distribution. The research shows that these factors all affect the distribution of stress field in the fault intersection to different extents, and the influence of these factors on the principal stress in the vertical and horizontal directions is not exactly the same. When the intersecting angles are different, the vertical stress may appear as stress concentration or stress reduction, while the horizontal stress only shows as stress reduction. When the broken width is different, the vertical stress only shows stress concentration, while the horizontal stress may show as stress concentration or stress reduction ; The smaller the intensity of the broken belt, the greater the influence on the vertical stress, but the horizontal stress has a linear relationship; the shallow depth of the greater impact on the vertical stress, and as the depth increases, the depth of the horizontal stress The effect is not affected; the influence of key strength on vertical and horizontal stress is very similar.