底拱 meaning in English
invert
Examples
- With the increase of lateral pressure modulus , the magnitude of principal stress decreases and the direction of it is hardly changeable ; with the increase of the angle between the direction of the maximal horizontal principal stress on magnitude and the fault bearing , the magnitude of principal stress increase and its direction can hardly change ; with the increase of the elastic modulus of rocks , the magnitude of principal stress increases and the direction changes more ; with the increase of pr , the magnitude of principal stress decreases and the direction changes more ; with the increase of lateral pressure modulus , the principal stress at hance , the tress at topmost arch , bottom arch and principal stress at lateral arch decreases , with the increase of the depth of tunnel , the stress of surrounding rock also increases , and the poorer the quality of surrounding rock is , the little its principle stress is
分析得出，随着侧压力系数的增大，主应力量值减小，主应力方位难改变；随着与断层走向的夹角增大，主应力量值增大，应力方向难改变：随着岩石的弹性模量的增大，主应力量值增大，方向变化越大；随着泊松比的增大，主应力量值减小，方位变化越大。随着侧压力系数的增大，顶、底拱处的各应力值增大，拱腰处的主应力减小，剪应力增大，侧拱处的各主应力减小，同一侧压力系数的条件下围岩质量越差，各应力值也越小；随着洞室埋深的增加，围岩压力也增大，围岩质量越差，其应力值也减小。 - When there is original stage support only , the load ratio of surrounding rock gets more and more bigger with the increasing of crust stress , correspondingly , the load ratio of initial stage support gets smaller . when the initial stage support and the second support act each other , the load ratio of surrounding rock is more than fifty percent , and it has little change with the increasing of crust stress . the whole analysis of the surrounding rock and support shows that the bottom arch of liner and the feet of liner have serious stress concentration , so do the sidewalls and the foot of a wall of the surrounding rock
通过屈曲理论分析结果对比表明，弹性屈曲和突变失稳分析的结果比非线性屈曲分析的结果要大得多，非线性分析由于考虑了材料非线性和几何非线性，因而结果与实际接近实际；当只有初期支护时，随着地应力的增加，围岩的荷载分担率增大，相应地，初期支护的荷载分担率就减小了；当有初期支护和二次衬砌共同作用时，围岩的荷载分担率在50以上，这一分担率随地应力的增加其变化不大；支护和岩体的整体分析表明，衬砌底拱及拱脚处应力集中严重，隧道岩体侧墙及墙角围岩的应力集中也较大。