DBPapers
DOI: 10.5593/sgem2017/12/S02.018

COMPARATIVE ANALYSIS OF SOLUTIONS FOR EXECUTION DEEP EXCAVATIONS

N. Calin, I. Bica
Sunday 10 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7105-99-5 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 12, 135-142 pp, DOI: 10.5593/sgem2017/12/S02.018

ABSTRACT

Foundation construction issues have emerged from ancient times, since antiquity, along with the constructions of dams, canals, ports and buildings with different destinations. On the occasion of these constructions, practice has shown that are obtained a low strain and a high stability if are included in their composition a distinct part that is lowered below the natural ground.
The construction of foundations by ordinary methods becomes even more difficult if is made under the underground water level. Also when the constructions are carried out in winter, the cost and execution time are increasing. Therefore, is necessary to search for new technological processes of a high technical and economic efficiency.
One of the most difficult problems to be solved by the civil engineer on the foundations execution is linked to the presence of surface water and underground water. Current technology offers a whole range of methods to solve these problems, but the use of these methods must be made discerning, depending on the specific condition of the site and the work.
Working methodologies adopted to achieve excavations in the presence of groundwater depend on a number of factors that are including the construction size, the foundation level, foundation soil, etc.
The authors propose to carry out a description of the solutions adopted for the implementation of deep excavations, theirs environmental impact and also which will be the influence of these solutions for deep underground foundations on hydrogeological conditions.
This paperwork addresses a number of issues related to the choice of solutions for achieve deep excavations, as well as a number of issues regarding the dewatering and drainage works.
These aspects take into account the problems that may occur in dewatering works or drainage works may be classified as:
• Risks related to mechanical effects (for example: hydrodynamic entrainment);
• Hydraulic breaking of the excavation base;
• Differential settlement

Keywords: dewatering, underground water, subsidence, geotechnical.