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Issues

ISSN 1470-9236
EISSN 2041-4803

Thematic set: Keeping lessons alive in engineering geology

Quarterly Journal of Engineering Geology and Hydrogeology October 24, 2019, Vol.52, 399-400. doi:https://doi.org/10.1144/qjegh2019-128
Quarterly Journal of Engineering Geology and Hydrogeology April 01, 2019, Vol.52, 401-413. doi:https://doi.org/10.1144/qjegh2018-171
Quarterly Journal of Engineering Geology and Hydrogeology April 26, 2019, Vol.52, 414-424. doi:https://doi.org/10.1144/qjegh2018-184
Quarterly Journal of Engineering Geology and Hydrogeology May 15, 2019, Vol.52, 425-434. doi:https://doi.org/10.1144/qjegh2018-156
Quarterly Journal of Engineering Geology and Hydrogeology May 15, 2019, Vol.52, 435-444. doi:https://doi.org/10.1144/qjegh2018-187
Quarterly Journal of Engineering Geology and Hydrogeology October 04, 2019, Vol.52, 445-458. doi:https://doi.org/10.1144/qjegh2018-186
Quarterly Journal of Engineering Geology and Hydrogeology September 13, 2019, Vol.52, 459-480. doi:https://doi.org/10.1144/qjegh2018-198
Quarterly Journal of Engineering Geology and Hydrogeology October 03, 2019, Vol.52, 481-500. doi:https://doi.org/10.1144/qjegh2019-024
Quarterly Journal of Engineering Geology and Hydrogeology September 26, 2019, Vol.52, 501-518. doi:https://doi.org/10.1144/qjegh2018-189

Research article

Quarterly Journal of Engineering Geology and Hydrogeology April 08, 2019, Vol.52, 519-528. doi:https://doi.org/10.1144/qjegh2017-142
Quarterly Journal of Engineering Geology and Hydrogeology April 17, 2019, Vol.52, 529-535. doi:https://doi.org/10.1144/qjegh2018-195
Quarterly Journal of Engineering Geology and Hydrogeology May 15, 2019, Vol.52, 536-546. doi:https://doi.org/10.1144/qjegh2018-174

Photographic feature

Quarterly Journal of Engineering Geology and Hydrogeology May 15, 2019, Vol.52, 547-556. doi:https://doi.org/10.1144/qjegh2018-115

Technical note

Quarterly Journal of Engineering Geology and Hydrogeology May 17, 2019, Vol.52, 557-562. doi:https://doi.org/10.1144/qjegh2018-199

Discussion

Quarterly Journal of Engineering Geology and Hydrogeology August 19, 2019, Vol.52, 563-568. doi:https://doi.org/10.1144/qjegh2019-073

Discussion Reply

Quarterly Journal of Engineering Geology and Hydrogeology August 19, 2019, Vol.52, 569-570. doi:https://doi.org/10.1144/qjegh2019-100

Book review

Quarterly Journal of Engineering Geology and Hydrogeology July 15, 2019, Vol.52, 571. doi:https://doi.org/10.1144/qjegh2019-078
  • Cover Image

    Cover Image

    issue cover

    The journey-time between Gundewein and Mekane Selam, two towns located at approximately 2660 m a.s.l. in the Ethiopian Highlands, has been cut by more than 75% by the construction of 129 km of mountain road and a 300 m long bridge. The bridge is across the Blue Nile and 58 km of this new road descends and ascends the steep sides of the 1300 m deep BlueNile gorge on an alignment with a cumulative rise and fall of over 2500 m over a straight-line distance of 21 km. The terrain is one of the most challenging of any for new road construction. Its underlying geology comprises Oligocene–Miocene basalt and pyroclastic rocks (pictured) overlying Cretaceous sandstone and siltstone which, in turn, overlie Late Jurassic limestone mudstone and shale. Its geomorphology comprises lithologically-controlled benches separated by sheer cliffs, with extensive deposits of colluvium, taluvium and rafted rock debris. Geohazards include large-scale rock toppling, rock falls, deep-seated and shallow landslides, flash flooding, shifting stream channels, slope erosion, stream erosion, debris flows, debris fans, seepage erosion and cavity collapse. The Total Geology Approach to design and construction involved landscape modelling, geotechnical reference condition mapping, engineering geological mapping and targeted ground investigation, implemented by a team of national and international specialists between 2006 and 2015. The dynamism of the terrain, and in particular the adjustment of its geomorphology to earthworks and road drainage systems, meant that slope stability and erosion problems required careful attention during construction, as they will during the operational lifetime of the road. The Gundewein – Mekane Selam road was designed initially by Renardet SA/SABA Engineering. This design was reviewed and revised by ScottWilson (now AECOM). Construction was undertaken by CGC Overseas Construction Group, Beijing under the supervision of ScottWilson/Dana & Associates and on behalf of the Ethiopian Roads Authority. Further details can be found at https://doi.org/10.1007/s10064-015-0724-y and https://doi.org/10.1144/qjegh2018-058

    Photograph by: G J Hearn

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