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| 侧导硐超前掘进当地质条件复杂且不甚清楚时,在隧道掘进过程中如采取先拱后墙法，有可能发生上覆岩体压力骤然增大,拱部围岩承载力降低和拱部下沉冒顶的事故。在这种情况下应采取先从两侧超前开挖导硐，并作好边墙的混凝土衬砌，然后再开挖拱部的施工方法 | |||
| 侧导坑; 侧壁导坑 (法); 边墙导坑; 隧道的侧壁导洞 | |||
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| 侧缘标题 | |||
| 侧标题 | |||
| 侧栏 | |||
| 侧冒口 | |||
| 打印件侧标题; 边缘标题 | |||
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side heading : 27 phrases in 6 subjects |
| Automobiles | 3 |
| Hydraulics | 1 |
| Plastics | 5 |
| Rail transport | 6 |
| Sports | 1 |
| Technology | 11 |
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