MICRO-BLOCK STRUCTURE OF THE GEOLOGICAL ENVIRONMENT AS A FACTOR OF THE GEOLOGICAL RISKS FOR URBAN TERRITORIES
Journal Title: Вісник Одеського національного університету. Географічні та геологічні науки - Year 2019, Vol 24, Issue 1
Abstract
Problem Statement and Purpose. Geological risks are the specific risks at buildings construction and operation; those risks influence decision-making connected with building, reconstruction, development of protection schemes and pre-investment feasibility studies. The results of studies performed during recent decades have shown that significant role in buildings and constructions deformation, forming and dynamics of landslide processes and peculiarities of groundwater regime is played by inhomogeneity of geological environment expressed through its hierarchical and block (including micro-block) structure. The paper aims at engineering & geodynamical assessment of the territory of Odessa Infectious Diseases Hospital and identification of the sites of potential geological risk connected with inter-block zones. We also plan to justify statement that geodynamic factor is one of geological risk key factors during designing and operation of buildings and constructions. Data & Methods. Data from geological drilling (stratigraphic affiliation, lithology, absolute layer elevations отметки слоев, groundwater layers) of 83 boreholes and instrumental measurements of technological tunnel constructive elements’ deformation and displacement collected during 40 years long operation period (1970-2011) have been used to study the main structural and tectonic features of the Infectious Diseases Hospital area. Cartographic modeling based on the gradient zones found (i.e. the zones within which abnormally quick changing of geological surfaces elevation marks was revealed in this or that direction) has been used as the method to determine the highest geological risk zones. As is known, such zones are the indicators of differential movement of different scale geoblocks, including the smallest ones having typical size of dozens of meters. Maps of gradients of relief of the top of plastic sand and clay Meotain depositions and «fragile» pontic limestones have been built. To reveal spatial periodicity of deformation and displacement of the technological tunnel constructive elements spectrum and harmonic analysis (Fourier transform) has been done. Statistical and cartographic analysis of the above datasets was done according to traditional methodologies realized in the software Statistica, Matlab and Surfer. Results. Based on engineering & geodynamical analysis (geo-historical studies, geological data and instrumental measurements) disjunctive dislocations forming hierarchical and block structure of geological environment of Odessa Infectious Diseases Hospital and being the zones of increased engineering & geodynamical risks were revealed. It is shown that key role in the strategy of geological risks studying should be played by structural & tectonic factor. The regularities identified at the territory of the city Infectious Diseases Hospital are typical of the entire Odessa region and show that significant role at engineering & geological assessment of the city area is played by micro-block structure of geological environment whose main elements are inter-block zones. Extreme gradients of speed and deformation caused by differentiated character of blocks movement are typical of such zones; the zones can lead to selective destruction of buildings, constructions and communications, and be a prerequisite to decrease of slopes stability. The methodological complex proposed can be used successfully in many urban regions for identification of the sites of potential geological risk connected with inter-block zones.
Authors and Affiliations
T. V. Kozlova, Ye. A. Cherkez, K. K. Pronin
Keywords
Related Articles
- EP ID EP662472
- DOI 10.18524/2303-9914.2019.1(34).169718
- Views 56
- Downloads 0
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