Surgil ESIA Report - Volume III - EKN

“O’ZLITINEFTGAZ”
open joint-stock company
FS «Complex development of Surgil 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
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