Surgil ESIA Report - Volume III - EKN

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“O’ZLITINEFTGAZ” open joint-stock company FS «Complex development of <strong>Surgil</strong> field with extracting of valuable components» Complex of Paleogene deposits is practically anhydrous and serves as the regional waterproof rock. 2) Marlaceous-limestone complex of deposits is bedded over the described above complex and is from late Neogene (Miocene) period (carbonate formation – group of semihard rocks) and presented with limestones having interbeds of marls, argillas, gypsum and sandstones. The thickness of these deposits is 40-110m. Described complexes are overlain with thin cover of overburden such as loamy sands, loams and sands. In hydrogeological regard ground water in the area in question occur at a depth of over than 25.0m. Ground water has low pressure rate, 3-30g/l salinity rate and clearly defined sulfate and sulfatechloride aggressiveness. This water can be used for the service purposes only. Soils are characterized with the solid residue rate which is 9,560-28,160mg/kg, chlorine ions concentration which is 1,240-10,560mg/kg and sulfate ions concentration which is 2,950-17,950mg/kg. In accordance with BC 2.03.11-96 «Corrosion protection for building structures» the soils with such chlorine ions concentration are strongly aggressive to the concretes based on Portland cement and Portland-slag cement according to SS 10178-85 and sulfate-resistant cements according to SS 22266- 94. According to research performed by «O'ZLITINEFTGAZ» open joint-stock company the foundation soils in question are ranged from low to high degree of corrosive aggressiveness. During carrying out of geological engineering study at UGCC site they assigned three engineering-geological elements according to lithological profile (Attachment 1). The first engineering-geological element (EGE-1) is presented with interstratified loamy sands and loams with non-clearly defined interfaces which are plastered, macroporous and subsiding. Type of subsidence – I due to minor thickness. EGE-1 soils are widely spread in the upper part of profile. The thickness of the bed is up to 1.0m. Design resistance of soil in normal condition R 0 = 250kPa (2.5kgf/cm 2 ), in water-saturated condition R 0 = 150kPa (1.5kgf/cm 2 ). Group of soil according to mining – p.366. EGE-1 soils are recommended to be removed due to their strength properties and deformation behavior. Table 1 – Physical-mechanical properties of EGE-1 soils Characteristic Unit Normative value Specific weight of soil particles g/cm 3 2.67 Specific weight of soil g/cm 3 1.60 Specific weight of dry soil g/cm 3 1.56 Porosity % 41.6 Porosity factor 0.712 Natural humidity % 2.4 Humidity 0.1 Humidity at the yield point % 19.1 Humidity at the rolling point % 13.3 Plasticity number % 5.8 Consistency index > 0 Permeability coefficient m/d > 3.0 Book 5. Declaration of environmental impact concerning UGCC construction 12
“O’ZLITINEFTGAZ” open joint-stock company FS «Complex development of <strong>Surgil</strong> field with extracting of valuable components» The second engineering-geological element (EGE-2) is presented with marls with interbeds of limestones and argillas from Neogene period. EGE-2 soils are spread in the middle part of profile. Penetrated thickness of the bed varies from 2.0 to 12.0m. Group of soil according to mining – p.24a. EGE-2 soils are recommended to be removed due to their physical-mechanical properties particularly due to unevenness of limestones spreading and thickness as well as for marlaceous and argillaceous deposits dilatation. Table 2 – Physical-mechanical properties of EGE-2 soils Characteristic Unit Normative value Specific weight of soil particles g/cm 3 2.71 Specific weight of soil g/cm 3 1.87 Specific weight of dry soil g/cm 3 1.58 Porosity % 41.7 Porosity factor 0.715 Natural humidity % 18.8 Humidity 0.7 Humidity at the yield point % 38.8 Humidity at the rolling point % 18.7 Plasticity number % 20.1 Consistency index 0.3 The third engineering-geological element (EGE-3) is presented with limestones, limestones-shell rocks, slab-morphe limestones with interbeds of argillas and marls. EGE-3 soils are spread in the lower part of profile. The thickness of bed is over than 25.0m. Design resistance of soil to uniaxial compression R e = 5.0-15.MPa (50.0-150.0kgf/cm 2 ). Group of soil according to mining – p.16c. Table 3 – Physical-mechanical properties of EGE-3 soils Characteristic Unit Normative value Specific weight of soil particles g/cm 3 2.71 Specific weight of soil g/cm 3 1.89 Specific weight of dry soil g/cm 3 1.87 Porosity % 31.0 Porosity factor 0.449 Natural humidity % 0.8 Recommended engineering measures: 1. Anticorrosion; 2. Antiseismic; 3. Antisubsiding for EGE-1 soils; Recommendations on soil stabilization: • EGE-1 are recommended to be removed due to their strength properties and deformation Book 5. Declaration of environmental impact concerning UGCC construction 13
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Surgil ESIA Report - Volume III - EKN

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