Effects of shallow tunnels on the groundwater table levels

Marinos, PG; Kavvadas, MJ

dc.contributor.author	Marinos, PG	en
dc.contributor.author	Kavvadas, MJ	en
dc.date.accessioned	2014-03-01T01:45:56Z
dc.date.available	2014-03-01T01:45:56Z
dc.date.issued	1997	en
dc.identifier.issn	00741612	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24800
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0031245833&partnerID=40&md5=651d9da3767953ec25c71848f70c92f6	en
dc.subject.other	Aquifers	en
dc.subject.other	Computational fluid dynamics	en
dc.subject.other	Finite element method	en
dc.subject.other	Groundwater flow	en
dc.subject.other	Hydraulics	en
dc.subject.other	Mathematical models	en
dc.subject.other	Mechanical permeability	en
dc.subject.other	Tunnels	en
dc.subject.other	Groundwater table	en
dc.subject.other	Hydraulic gradient	en
dc.subject.other	Groundwater	en
dc.title	Effects of shallow tunnels on the groundwater table levels	en
heal.type	journalArticle	en
heal.publicationDate	1997	en
heal.abstract	The paper investigates the steady-state rise of the groundwater table upstream of a shallow tunnel due to the obstruction of the groundwater flow in the direction normal to the tunnel axis. The effects are studied using a steady-state finite-element groundwater flow model. Based on the results of the finite-element analyses, the paper proposes a simplified analytical method which gives reasonably accurate predictions of the magnitude of the water table rise via a closed-form analytical expression. It is shown that the predicted magnitude of the steady-state water table rise is proportional to the tunnel height and to the original hydraulic gradient in the direction normal to the tunnel axis. The predicted rise of the water table also depends on the depth of the tunnel below the original groundwater table. For uniform ground permeability, the predicted steady-state rise is independent of the hydraulic parameters of the aquifer, while the time required for the water table to gradually rise and eventually reach the steady-state condition is obviously dependent on the permeability and storativity characteristics of the aquifer. For typical values of the hydraulic gradient (2-5%), the predicted water table rise is in the order of 5-20% of the tunnel height for tunnels located just below the original level of the water table.	en
heal.publisher	Int Assoc of Engineering Geology, Paris Cedex 15, France	en
heal.journalName	Bulletin of the International Association of Engineering Geology	en
dc.identifier.issue	56	en
dc.identifier.spage	61	en
dc.identifier.epage	64	en