Every geotechnical engineer knows E. Hoek and his significant contribution to rock mechanics. Here you can find his first on line lecture titled “The Development of Rock Engineering”, you just need to enter your name, e-mail and company and you get the password to view the on line lecture. This lecture provides interesting historical background … Continue reading Development of Rock Engineering and updating EC7
November – December issue of Geo-Strata which is a published forum of the Geo-Institute of the American Society of Civil Engineers (ASCE) featured an article by Patrick C. Lucia, Chairman Emeritus of Geosyntec Consultants, titled “As I See It: Geotechnical Forensic Engineering in Defense of Geotechnical Engineers”. In the article Patrick shares his over 25 … Continue reading Geotechnical engineering standard of care
Geotechpedia enters 2014 with the ambition to provide more geotechnical information and contribute to the geosociety with interesting and valuable publication links, software from the industry and equipment used in the sector. Geotechpedia now has an updated look and feel more appropriate for today’s web. We hope we can make your experience more efficient and pleasurable … Continue reading Geotechpedia 2014
A brief feedback from Chrys Steiakakis A brief summary for all the people that could not make it to the 18th International conference on soil mechanics and geotechnical engineering held on Paris between Monday 2 and Friday 6th of September 2013. The conference main theme was “Challenges and Innovations in Geotechnics”. The conference commenced with … Continue reading ISSMGE Paris 2013. What did you miss?
I am sure that many geotechnical designers have either been asked this question or have had to answer it internally in order to price a project. After the offer has been prepared, comes the negotiation phase, where the owner of the project starts asking questions about the “high” price (in his opinion) or about a … Continue reading How much does a geotechnical design cost?
Greece is a country with high seismicity rates. As a consequence evidences of faulting are spread throughout the country. In this blog a particular fault mirror has come into our notice in central Greece, Fthiotida area, known as Arkitsa fault. This spectacular fault mirror is a subvertical feature 65m tall and about 300m long. The … Continue reading Impressive fault mirror study in central Greece
NATM or New Austrian Tunneling Method has been for long time under scrutiny. Many disagree that was “NEW” in 1957 (Kovari 2003, Jaeger 1979) when it was introduced by L. von Rabcewicz. Many more have disagreed with the term “METHOD” such as Kovari 1993. The term “NEW” was introduced by Rabcewicz to distinguish what he … Continue reading NATM is it New, Austrian or a Method?
When tunnels are excavated with conventional drill and blast operations or via mechanical excavation for softer material, the quickest way to support is the use of shotcrete. This method is called Sprayed Concrete Lining (SCL) in the UK and in other countries it is named as New Austrian Tunneling Method (NATM). In reality NATM is … Continue reading Fiber reinforced shotcrete or wire mesh for tunnel support
Things to remember when using the Mohr – Coulomb failure criterion: The linear failure envelope is just an approximation to simplify calculations The failure envelope is stress dependent and will produce some kind of curvature if shear strength tests are executed in much different confining stresses (fig 1, from Duncan and Write, 2005). According … Continue reading Mohr – Coulomb failure criterion continued
This is something that all geotechnical engineers should know but it is surprising how many do not! Just a brief overview of how the Mohr – Coulomb strength criterion came about. The Mohr – Coulomb criterion is the outcome of inspiration of two great men, Otto Mohr born on 1835 and passed away on 1918 … Continue reading The Mohr – Coulomb strength criterion