Spr�ngningens p�verkan av den injekterade zonen i infrastrukturtunnlar
| 项目名称： | Spr�ngningens p�verkan av den injekterade zonen i infrastrukturtunnlar |
| 摘要： | In tunneling, pre-grouting is the completely dominant method of sealing the rock, thus minimizing the risk of adverse consequences that may result from leakage of groundwater in the tunnel. Although a well-thought-in design design follows, there is a leakage in the tunnel, which may be due to the lack of water-bearing structures in the rock, but also that the blasting affects the grouting. For several years, the Swedish Transport Administration has carried out studies of excavation damage zones(EDZ) from above ground and tunnel projects, and these studies have shown that the EDZ at the tunnel is only about 20-40 cm for contour and 40-60 cm for the bottom charge. Therefore, the fractures formed during the blasting should not affect the grouting because, in theory, the grouting zone usually has 4-5 m thickness. However, if the natural fractures in the mountain have an unfavorable direction, the blast gases could go into these and thus affect the grouting. This could be a reason why, despite the well-thought-out design, the tunnels are never completely dense. The project will investigate how the grouted zone is affected by tunnel blasting. By mapping the zone into full scale in a real tunnel, the results of the project can help develop new methodology and workflow for how the grouting can be carried out in tunnels. |
| 资金： | 0.00 |
| 资助组织： | Trafikverket, Sweden |
| 项目负责人： | �keson, Urban |
| 执行机构： | Trafikverket, Sweden |
| 开始时间： | 20171001 |
| 预计完成日期： | 20190531 |
| 实际结束时间： | 0 |
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