摘要
基于强度折减法,利用有限元软件ANSYS建立二维边坡模型,采用Plane82单元进行网格划分,并对可能出现的滑坡体细化网格,研究爆破荷载作用下的边坡动力稳定性。以计算不收敛作为边坡失稳的判定准则,求得边坡静力安全系数为2.36;以边坡坡底节点位移突变作为边坡动力失稳的判定准则,求得爆破动荷载作用下的边坡动力安全系数为2.24。模拟结果表明:给定边坡在当前爆破动荷载作用下,其动力安全系数相对于静力安全系数降低了5.08%。通过对坡底节点位移时程曲线的变化规律进行研究发现,随着边坡抗剪强度参数的折减,边坡坡底节点的水平最大位移也在缓慢增加,主要是由于边坡强度折减造成的塑性位移增加。
Based on the strength reduction method, the finite element software ANSYS was used to establish two- dimensional slope model, by meshing the slope model with Plane82 element, and refining the grid at the potential landslide body, by which the slope stability under blasting loading was studied. Taking the non-convergent of calculation as a criterion for judging the instability of the slope,the slope safety factor under static load is 2.36. Taking displacement mutation of the slope bottom node as the criterion for judging the dynamic instability of the slope, the slope safety factor under blasting dynamic load is 2.24. The simulation results show that, compared with the static safety factor, the dynamic stability safety factor of the given slope decreases by 5.36% under the current blasting dynamic load. In addition, through the research on the change law of the displacement time-history curve of slope bottom node, it is found that with the reduction of the shear strength parameters of slope, the maximum horizontal displacement of the node at the bottom of the slope is also increasing, which is mainly due to the plastic displacement increasing caused by the strength reduction of the slope.
出处
《爆破》
CSCD
北大核心
2016年第4期140-145,共6页
Blasting
关键词
爆破荷载
强度折减法
有限元软件ANSYS
位移时程曲线
边坡安全系数
blasting load
strength reduction method
finite element software ANSYS
displacement time-history curve
slope safety factor
