This is a guest post by Mr. Ian Gray, Managing Director of Sigra Pty Ltd. Towards a technology for shallow testing in civil projects We have found that the equipment and methodology being employed for permeability testing in shallow wells to be, if not inadequate, at the very least misapplied. We propose a cross-disciplinary approach — involving … Continue reading Measuring Permeability and Fluid Storage in the Ground
Proposal for estimated Earth Pressures on Cut and Cover Sidewall in rock cuts A common design issue many Geotechnical Engineers have come across in their career is the estimation of earth pressures on a Cut and Cover (C&C) sidewall located close to a rock cut. Usually, a C&C structure is designed and constructed close to … Continue reading Estimated Earth Pressures on Cut and Cover Sidewalls
“I like to listen. I have learned a great deal from listening carefully. Most people never listen.” Ernest Hemingway First of all we would like to thank you all for participating in our online survey (16 June – 17 July 2016) regarding Geotechpedia’s future. As we truly value your opinion we made the first step … Continue reading Geotechpedia Online Survey Questionnaire Results
An anchor is a structure consisting of a tendon free length (designed to satisfy overall structural stability) and a restraint (designed to transmit tensile forces to the surrounding ground). According to Eurocode 7 (EC7) – Part 1 , the design pull-out resistance of an anchorage Ra,d must satisfy the following inequality: Pd ≤ Ra,d ,where … Continue reading Ultimate Bond Strength of Anchors in Rock
A major milestone at Klokova tunnel has been reached on June 23rd, as part of IONIA Odos Motorway overall progress, with the breakthrough of the twin tunnel right branch (length: 2,900m approximately). TERNA S.A. engineers tunneled through the final few meters connecting the two segments of the right branch on Thursday afternoon (23/06/2016), after less than 2-years since mobilisation … Continue reading Geosysta at Klokova Tunnel Breakthrough (photos and videos)
Training and professional development have always been integral to operations at Geosysta. It is our priority to keep our team learning new skills and maintain our strong connections with academia and professionals by always trying to share our knowledge in the fields of geotechnical and mining engineering. As part of our constant evolvement, Geosysta participated … Continue reading Geosysta at 12th International Symposium on Landslides (ISL)
Greetings to all Geotechpedia’s fans! First I would like to thank all of you for making Geotechpedia one of the most popular sites on the online world of geotechnical engineering. We have our google analytics reports continuously improving to prove that! Your ideas and needs led us to add new sections in our site such … Continue reading Geotechpedia: A geotechnical portal that is constantly evolving!
In my previous entry regarding the Yeager airport landslide where I hypothesize for a possible shear zone somewhere near the foundation, I got some interesting comments from fellow engineers. In this entry I would like to clarify some issues. The hypothesis made about a shear zone was based on published information regarding intercalation of sandstone … Continue reading Yeager Airport Expansion slide additional comments
Recent news and photographs present the spectacular slide that occurred in the Yeager Airport Expansion Runway 5. The slide occurred in the South slope which was among the highest if not the highest (~74m) reinforced earth slope in the US. The project had received the award of Excellence – TenCate Geosynthetics in 2007 International Achievement … Continue reading What could have gone wrong in Yeager Airport Expansion slide?
This is a very controversial topic in which a straightforward answer is not possible. In this entry I would like to tackle some issues related to our own profession since we are responsiblefor the “acceptable” amount of investigation. Recently I attended the IAEG 2014 (Engineering Geology) conference in Torino. In this conference numerous interesting … Continue reading Geotechnical investigation data, always not enough?