Abstract
AbstractImproper recognition of the subsoil is the most common cause of problems in the implementation of construction projects and construction facilities failures. Most often, their direct cause is the mismatch of the scope of geotechnical diagnosis to the appropriate geotechnical category, or substantive errors, including incomplete or incorrect interpretation in the creation of a geological-engineering model and often overlooked hydrogeological conditions. In many cases, insufficient recognition and documentation of geotechnical and/or geological and engineering conditions leads to damage and construction failures, delays in consider construction, and the increase of the investment budget. That’s why, in order to avoid the above, particular attention should be paid to proper geotechnical and geological-engineering documentation at the design and construction stages. The selected example of the investment analyzed errors in the geological-engineering documentation, which mainly concerned the lack of recognition of locally occurring organic soils, the incorrectly determined location of the groundwater table and the degree of compaction of non-cohesive soils, and numerous errors of calculated values of soil uplift pressure. The detection of the errors presented in the paper made it possible to select the correct technology for the construction of the sanitary sewage system and to increase the thickness of the horizontal shutter made of jet grouting columns in the area of the excavation. In addition, the article discusses the principles of proper calculation of limit states and subsoil testing, which have a significant impact on the implementation of planned investments.
Highlights
The foundation of buildings includes the design of foundations, and the way of transferring loads from foundations to the subsoil and preventing deformation of installations laid directly in the subsoil
The main goal of this study is to show the errors in documenting the subsoil as a result of overinterpretation of field test result
On the basis of the obtained test results and design documentation, calculations of the bearing capacity of the subsoil were made due to hydraulic failure – limit state of uplift (UPL) regarding the horizontal stability of the shutter from the columns planned to be made by high-pressure injection technique in the subsoil of planned investments
Summary
The foundation of buildings includes the design of foundations, and the way of transferring loads from foundations to the subsoil and preventing deformation of installations laid directly in the subsoil. The examples of problems in the implementation of construction works and failures of construction works known from engineering practice result from insufficient fulfillment of formal conditions. Their direct causes are most often substantive errors, including incomplete or incorrect interpretation in the preparation of geologicalengineering and geotechnical documentation, including frequently overlooked hydrogeological conditions [4]. It often happens that the scope of the subsoil research is not adjusted to the geotechnical category, i.e., the complexity of the planned investment [5,6]
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