.... The method to obtain water in these volcanic areas involves digging horizontal galleries with explosives. The galleries cross the dikes and drain the water from the water saturated area. The main problem of this type of perforation is to obtain the water continually, without the possibility of water...

... a series of small galleries above the cavern roof and from these gal- leries to install reinforcing elements before excava- tion of the cavern commences. These reinforcing elements will induce compressive stresses in the rock mass immediately above the cavern roof that will provide the confinement required...

...Volcanic Rock Mechanics Olalla et al. (eds) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-58478-4 An access gallery to the underground Fuente Santa spring, La Palma, Spain C. Soler Dirección General de Aguas del Gobierno de Canarias, Spain ABSTRACT: This paper presents the work done...

... of the soil nails quantity defined in the natural slopes, translated into an economy for this type of works of about 1200 m, corresponding to 14% of the previewed total. During the works execution six natural water storage galleries were found, from which only two had already been identified but without any...

... tunnels along the referred expressway, as well as a number of safety aspects related to these tunnels. Reservoir Characterization volcanic complex characteristic cross-section layby rock bolt geotechnical zone zg2 application expressway double tunnel gallery shotcrete excavation...