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ASSESSMENT OF THE ENCLOSING WALL FOR PREVENTING OF GROUND DEWATERING CAUSED BY BUILDING OF UNDERGROUND CONSTRUCTIONS IN THE TOWN RIGA, LATVIA
Abstract
In order to erect an underground construction, it is necessary to drain its trench by pumping out groundwater. If information on hydrogeological data of the place and on the trench are available then it is possible to estimate, by using modelling, the necessary pumping rate and to compute lowering of groundwater head at the trench surroundings (depression cone) developed by the pumping. There ground dewatering happens that may cause subsidence of buildings and streets and to worsen life of plants. For this reason, the dewatering must be considerably minimized. It can be done by enclosing the trench by a watertight wall. In the town Riga, a many storied house will be built. It includes underground floors that can be created only in the drained trench. To find the wall depth and permeability, the detailed hydrogeological model (HM) has been built (size 400m?400m, 7 layers, plane approximation step 0.5m). To run HM, the commercial software Groundwater Vistas 6 was applied. The impact of the most probable failures of the wall was investigated. The original methodology of modelling has been applied. It may of interest for modelers dealing with finding of depression cones caused by groundwater withdrawals.
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References7
Environmental Simulations, Inc. Groundwater Vistas. Version 6, Guide to using, 2011
Harbaugh W., MODFLOW-2005, U.S. Geological Survey Modular Ground-Water Model: the ground-water flow process, chap 16, book 6, US Geological Survey Techniques and Methods 6-A16, USGS, Reston, VA
Golden Software, Inc., SURFER-12 for Windows, Users manual, Guide to Using, 2015. 11, Dec. 2016
Map of Riga was prepared by Jana Seta Ltd.
Report on hydrogeological study for the living house in Riga, 72 Terbatas str., prepared by SIA DEKO division Geology, Topology, Design Riga, 2006, 23 page (in Latvian)
Information provided by the joint stock company VentEko on the underground construction of the living house in Riga, 72 Terbatas str. (in Latvian)
Report on modelling changes of groundwater regime for the house in Riga, 74 Terbatas str., Riga Technical University, 2018, 6 Pages, 18 Figures (in Latvian)
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