| 张社荣,梁礼绘.考虑三维应力旋转的隧洞衬砌支护时机研究[J].水利学报,2007,38(6):704-709 |
| 考虑三维应力旋转的隧洞衬砌支护时机研究 |
| Analysis on tunnel liner supporting time considering three dimensional stress rotation |
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| DOI： |
| 中文关键词: 隧洞开挖 数值模拟 应力路径 衬砌支护 应力旋转 |
| 英文关键词: tunnel excavation numerical simulation stress path liner supporting rotation of principle stress direction |
| 基金项目: |
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| 中文摘要: |
| 基于岩体裂隙的扩展机理对隧洞开挖过程进行数值模拟，通过对模型中计算点岩体的应力路径分析表明，随着隧洞挖掘的深入，其顶部岩体的第三主应力方向由竖直向下旋转至沿洞壁的切线方向，隧洞边墙岩体的第三主应力方向一直维持不变。当掌子面推进至超过计算点3m左右时，顶部计算点岩体的应力旋转趋于稳定。对隧洞顶部计算点岩体的位移路径分析表明，沿隧洞纵剖面观察，其顶部岩体的位移方向与竖直方向(向下为正)的夹角随掌子面地推进逆时针从42°变化至-3°，同样也是在掌子面推进至超过计算点3m左右时位移方向变化趋于稳定，因此应该在此时对围岩进行衬砌支护。 |
| 英文摘要: |
| The mechanism of the fracture propagation in rock in the process of tunnel excavation is numerically simulated using explicit finite difference method. The calculated stress path of the calculation point at the top of tunnel indicates that the orientation of the third principle stress rotates from its initial vertical direction to the tangential direction along the tunnel wall, but the direction of the third principle stress on the runnel wall maintains unchanged. When the excavation face advances to the distance from the calculation point exceeding 3m, the rotation tends to stable. The analysis on the displacement of the calculation point located at the top of tunnel also shows that its direction will counter clockwise rotate 45° until the excavation face advances distance exceeding 3m. It may conclude that this is the suitable moment for tunnel liner supporting. |
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