| 1 | As a result, the tunnel face was stable during construction and the project progressed smoothly. | |
| 2 | Site control for the sampling from heading faces, blasted holes, blasted piles and stone stock piles; | |
| 3 | Collapse at tunnel face may occur during construction in this kind of ground without advance consolidation. | |
| 4 | The results show that the excavations of tunnel face CRD1 - 4 have the most important influence on building settlement. | |
| 5 | Bring a thing into play first working face geology inquires into the portent reaching pencil sketching , judging that karst causes disaster within the earth's surface and the hole; |
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