Geotechnical characteristics and empirical geo-engineering relations of the South Pars Zone marls, Iran

2019-12-10
Azarafza, Mohammad
Ghazifard, Akbar
Akgün, Haluk
Asghari-Kaljahi, Ebrahim
This paper evaluates the geotechnical and geo-engineering properties of the South Pars Zone (SPZ) marls in Assalouyeh, Iran. These manly beds mostly belong to the Aghajari and Mishan formations which entail the gray, cream, black, green, dark red and pink types. Marls can be observed as rock (soft rock) or soil. Marlstone outcrops show a relatively rapid change to soils in the presence of weathering. To geotechnically characterise the marls, field and laboratory experiments such as particle-size distribution, hydrometer, Atterberg limits, uniaxial compression, laboratory direct-shear, durability and carbonate content tests have been performed on soil and rock samples to investigate the physico-mechanical properties and behaviour of the SPZ marls in order to establish empirical relations between the geo-engineering features of the marls. Based on the experiments conducted on marly soils, the USCS classes of the marls is CL to CH which has a LL ranging from 32 to 57% and PL ranging from 18 to 27%. Mineralogical analyses of the samples revealed that the major clay minerals of the marls belong to the smectite or illite groups with low to moderate swelling activities. The geomechanical investigations revealed that the SPZ marls are classified as argillaceous lime, calcareous marl and marlstone (based on the carbonate content) which show variations in the geomechanical properties (i.e., with a cohesion ranging from 97 to 320 kPa and a friction angle ranging from 16 to 35 degrees). The results of the durability tests revealed that the degradation potential showed a wide variation from none to fully disintegrated. According to the results of the experiments, the studied marls have been classified as calcareous marl, marlstone and argillaceous lime due to the variations in the carbonate and clay contents. The results have shown that an increase in the carbonate content leads to a decrease in the degradation potential and an increase in the density and strength parameters such as durability and compressive strength. A comparison of the empirical relationships obtained from the regression analyses with similar studies revealed that the results obtained herein are reasonably reliable.
GEOMECHANICS AND ENGINEERING

Suggestions

Geotechnical characterization and rock mass classification of the Antalya karstic rock masses
Sopacı, Evrim; Akgün, Haluk; Department of Geological Engineering (2012)
This thesis identifies the geotechnical parameters of the Antalya karstic foundation rocks (travertine/tufa), which are highly variable in nature, by means of geological observations, geotechnical site investigations, and field and laboratory geomechanics tests to examine karstic (mainly tufa) rock mass behavior. Several geotechnical parameters such as porosity, seismic wave velocity, uniaxial compressive strength, Young’s modulus, tensile strength, etc. that are thought to have significant influence on roc...
Landslide susceptibility assessment of South Pars Special Zone, southwest Iran
Azarafza, Mohammad; Ghazifard, Akbar; Akgün, Haluk; Asghari-Kaljahi, Ebrahim (2018-12-01)
This study assesses the landslide susceptibility of the South Pars Special Zone (SPSZ) region that is located in southwest Iran. For this purpose, a combinatorial method containing multi-criteria decision-making, likelihood ratio and fuzzy logic was applied in two levels (regional and local) at three critical zones (northwest, middle and southeast of the project area). The analysis parameters were categorised in seven main triggering factors such as climatology, geomorphology, geology, geo-structure, seismi...
Reactivity of limestones from different sources in Turkey
Hoşten, Çetin; Gulsun, M (Elsevier BV, 2004-01-01)
This paper presents a study on the reactivity of natural limestones from five deposits in Turkey. The conversion rates of carbonates in size fractions of the samples were measured in a stirred suspension of 2.5 1 at 20 degreesC and a constant-pH value of 5 obtained with the addition of HCl solutions by a pH control pump. Particle size and the dolomite content of the limestones were found to be the most influential parameters in the reactivity measurements.
Seismic response of base isolated liquid storage tanks to real and simulated near fault pulse type ground motions
Uçkan, Muhittin Eren; Umut, Onder; Sisman, Fatma Nurten; Karim Zadeh Naghshineh, Shaghayegh; Askan Gündoğan, Ayşegül (2018-09-01)
In this paper, the seismic response of base-isolated liquid storage tanks subjected to real and simulated near-fault ground motions is investigated. It is assumed that the tanks are seismically isolated by single surface Concave Sliding Bearings (CSB) with different isolation periods. For the input data, the recorded and simulated ground motions having pulse type characters and their dominant waveforms are considered.
Seismic hazard assessment for Cyprus
Cagnan, Zehra; TANIRCAN, GÜLÜM (Springer Science and Business Media LLC, 2010-04-01)
In the present study, probabilistic seismic hazard assessment was conducted for Cyprus based on several new results: a new comprehensive earthquake catalog, seismic source models based on new research, and new attenuation relationships. Peak ground acceleration distributions obtained for a return period of 475 years for rock conditions indicate high hazard along the southern coastline of Cyprus, where the expected ground motion is between 0.3 and 0.4 g. The rest of the island is characterized by values repr...
Citation Formats
M. Azarafza, A. Ghazifard, H. Akgün, and E. Asghari-Kaljahi, “Geotechnical characteristics and empirical geo-engineering relations of the South Pars Zone marls, Iran,” GEOMECHANICS AND ENGINEERING, pp. 393–405, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46135.