深切河谷应力场分布特征研究

摘要

利用数值模拟分析软件,研究了构造应力及卸荷带存在情况下深切河谷应力场分布特征及应力场分带标准.结果表明:1)结合初始应力场特征,可自自重应力与构造应力角度提出应力场分区标准.2)对于无卸荷带的均质弹性边坡,无构造应力作用时,可分为应力释放及应力平稳2个区.有构造应力作用时,可分为应力集中及应力平稳2个区.3)对于存在卸荷带的边坡,则从坡表到坡里可分为应力降低区、应力升高区及应力平稳区3个区.4)由于构造应力场的存在,使得河谷内应力集中的水平明显提高,集中的范围明显变大.5)随着卸荷带厚度的增加,应力集中区向坡体内部相应移动.%Using the numerical simulation software, the stresses field and grade standard to stress of a high valley slope with tectonic stress and unloading district are presented. Conclusions can be drawn as follows: 1) the stress field could be classified from self-weight stress and tectonic stress, combining with the in-situ stress field characteristic. 2) the homogeneous elastic slope without unloading district could be classified into two zones as the stress-releasing zone and the stress - stable zone from surface to inside without tectonic stress, stress-concentrating zone and stress-stable zone with tectonic stress. 3) the slope with unloading district could be classified into three zones as the stress-releasing zone, stress-concentrating zone and the stress - stable zone from surface to inside. 4 ) the stress concentrating zone and value would be increasing with tectonic stress increasing. 5 ) the stress concentrating zone transfers into the slope inside with the depth of unloading increasing.