煤层断层构造演化应力场分布特征数值模拟研究

Numerical simulation reaseach on stress field distribution of coal bed fault structure formation and evolution

采用有限元数值模拟软件ADINA,模拟了一次构造作用下煤层断层构造的形成过程以及煤层断层形成后受现代构造应力场作用下煤层的破坏情况及地应力的分布规律.模拟结果表明,一次构造作用下煤层断层构造的形成过程中,在接近断层面的下盘煤层底部和接近断层面的上盘顶部,煤体容易遭到破坏;断层构造形成后在不同的铅直应力和水平应力组合情况下,正逆断层的下盘断层面附近区域均存在应力集中现象,逆断层的应力场方向主要由最大应力的方向决定,而正断层仅在水平应力与铅直应力比较接近时,应力场方向主要由铅直应力决定.

Using the finite element numerical simulation software ADINA,simulated the tectonic fault structures under the action of the formation of coal seam,and the coal-bed fault after the formation of the modern tectonic stress field in the destruction of coal under conditions and the distribution of stress.Simulation results show that the tectonic fault structures under the action of the formation of coal seam,in the footwall near the fault plane of the seam and near the bottom of the fault plane of the plate at the top,coal vulnerable to damage;The fault structures after the formation of lead in different direct stress and horizontal stress combinations,the footwall fault plane of the normal and reverse faults exist in the vicinity of stress concentration phenomena,reverse fault stress field in the direction of maximum stress is from the direction of the main decisions,and when the normal faults only in the level of stress and lead vertical stress is closer,the stress field in the direction of the major decisions is made by the lead vertical stress.