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| Formation Mechanism and Treatment Measures for Volcanic Cavity Found in the Construction of Ethiopian Railway
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| WANG Mao-jing, ZHAO Ping |
| China Railway Eryuan Engineering Group Co.Ltd, Chengdu, Sichuan 610031, China |
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Abstract Abstract：Research purposes：Sebeta～Mieso section of the new Ethiopian railway is located in the Great Rift Valley, passing partly through the slope toe plains of Fantale dormant volcano, where a lot of small explosive volcanic cones are distributed and several developed ground fissures cross under the railway, the volcanic cavities concealed in the underground will endanger the safety of the railway works. Through the comprehensive ways of regional geological information collecting, geological investigation, geophysical prospecting and mechanical drilling in fieldwork, the distribution law of the volcanic cavities is found out to correctly evaluate the influence of cavities on the railway engineering, which is good for taking corresponding treatment measures to ensure the safety of the engineering.
Research conclusions：(1) Fantale volcano and plains region at the slope toe are the active district of the crustal plate and the quaternary volcano aggravating activity district. (2) Lava cavity, erosional cavity and ground fissure cavity are distributed along the railway. These cavities are closely related respectively to magmation, crustal motion and hydrodynamic activities. (3) There is no lava cavity existing underneath the subgrade. As for the ground fissure cavity and erosional cavity that endanger the safety of the railway engineering, the available treatment measures are put out for the cavities and the increasing expenditure is controllable.(4) This research conclusions can be applied to the geotechnical investigation field in volcanic activity region.
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