Papers by Davood Fereidooni
Rock Mechanics and Rock Engineering, Feb 18, 2016
Geotechnical characteristics and relationships between various physical and mechanical properties... more Geotechnical characteristics and relationships between various physical and mechanical properties were assessed for eight types of hornfelsic rock collected from southern and southwestern parts of the city of Hamedan in western Iran. Rock samples were subjected to mineralogical, physical, index, and mechanical laboratory tests and found to contain quartz, feldspar, biotite, muscovite, garnet, sillimanite, kyanite, staurolite, graphite, and other fine-grained cryptocrystalline matrix materials. Samples had a porphyroblastic texture, and the mineral contents and physical properties influenced various rock characteristics. Some rock characteristics were affected by mineral content, while others were affected by porosity. Dry unit weight, primary and secondary wave velocities, and slake-durability index were noteworthy characteristics affected by mineral content, while porosity had the greatest influence on water absorption, Schmidt hardness, point load index, Brazilian tensile strength, and uniaxial compressive strength. Empirical equations describing the relationships between different rock parameters are proposed for determining the essential characteristics of rock, such as secondary wave velocity, slake-durability index, point load index, Brazilian tensile strength, and uniaxial compressive strength. On the basis of these properties, the studied rocks were classified as being strong or very strong.
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Geomechanics and Engineering, 2018
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International Journal of Geotechnical Earthquake Engineering, 2015
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Journal of entomology and zoology studies, Jun 1, 2015
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Earth Sciences Research Journal, Dec 17, 2015
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Rock Mechanics and Rock Engineering, Aug 14, 2015
The compressive strength and deformability are the most important mechanical properties of rocks ... more The compressive strength and deformability are the most important mechanical properties of rocks in engineering applications. The critical factors influencing these parameters include constituent mineral composition, porosity, water content, temperature, anisotropy, and confining pressure (Li et al. 2012). Some rocks show well-defined fabric elements in the form of bedding, stratification, layering, foliation, fissuring or jointing. In general, these anisotropic rocks have physical, mechanical and hydraulic properties that are varied in different directions. Metamorphic rocks usually display the highest degree of anisotropy (Ramamurthy et al. 1993). The strength anisotropy of various rock types has been studied in compression tests by different researchers such as Donath (1964), McLamore and Gray (1967), Hoek (1968), Attewell and Sandford (1974), and Brown et al. (1977) on shales and slates, Ramamurthy et al. (1988) on phyllites, Akai et al. (1970), McCabe and Koerner (1975), Behrestaghi et al. (1996), Nasseri et al. (1997, 2003), Singh et al. (2001) and Zhang et al. (2011) on gneisses and schists. A review of the mentioned work shows that the maximum failure strength occurred when anisotropy angle (b) equals to 0 or 90 and it reaches to the minimum point when anisotropy angle (b) is about 30 . Saroglou et al. (2004a, b) tested Athens schist and gneiss under triaxial compression and they found that when anisotropy angle increases from 0 to 90 , the maximum principal stress (r1) declines and it reaches to the minimum value at b & 30 , and after that is rises again. With increasing confining pressure, the maximum values of r1 increase, and the mode of the curves between r1 and b are also U shape. According to Akai et al. (1970), the strength reduction of schists at b = 30 and 20 MPa confining pressure is about 50 %. According to Goshtasbi et al. (2006), slates of Sanandaj-Sirjan zone in Iran had a U-shaped anisotropy and their highest and lowest triaxial compressive strengths occurred at b = 90 and b = 30 , respectively. In these rocks, the maximum values of internal friction and cohesion occured at b = 90 and the minimum values occured at b = 30 . Li et al. (2012) studies on meta-sedimentary rocks show that triaxial compressive strength of rocks in perpendicular direction of the bedding planes was higher than the parallel direction under certain confining pressures. According to Ramamurthy et al. (1993) and Nasseri et al. (2003), the values of compressive strength and elasticity modulus in anisotropic rocks have a nonlinear relationship with anisotropy angle and confining pressure. Behrestaghi et al. (1996) found that the maximum strength happened at b = 90 in schists, throughout the range of confining pressure. They found that the minimum strength took place at b = 30 , nevertheless at confining pressures higher than 15 MPa, the minimum point of the curve shifted to b = 45 . A similar observation has been reported by McLamore and Gray (1967) for slate and Singh & Davood Fereidooni d.fereidooni@du.ac.ir
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Iranian Journal of Science
It is clear that the engineering properties of various rocks in dry and wet conditions are differ... more It is clear that the engineering properties of various rocks in dry and wet conditions are different. In general, the properties decrease with the presence of water. The present research investigates the effect of rock saturation on the strength and deformation properties of serpentinites collected from central Greece. A comprehensive laboratory test program was planned to evaluate unit weight, effective porosity, uniaxial compressive strength, elasticity modulus, and Brazilian tensile strength in saturated states. All the results of the above-mentioned saturated properties were compared with the respective properties measured in dry conditions taken from previous studies. Simple regression analyses were used to correlate the physical and mechanical properties of the two referred states. The obtained results revealed that the values of the considered physical and mechanical properties of the studied serpentinite rocks are deceased with the presence of water. There are good relations...
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International Journal of Rock Mechanics and Mining Sciences
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Construction and Building Materials
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Journal of entomology and zoology studies, 2015
The study of Diptera provide useful complementary data to estimate the post-mortem interval in fo... more The study of Diptera provide useful complementary data to estimate the post-mortem interval in forensic cases. For the use of insects in criminal investigations, study of insect fauna in each region is essential. This is the first report studying the flies associated with indoor carrion of two carcasses of rats (Rattus norvegicus), in Iran. Rat carcasses were exposed in an old room (6 m 2 ) of a house for 6 weeks in the Fars Province, Iran. In this period during; 3 families, 6 genera and 9 species were collected viz. Muscidae: Musca domestica and Ophyra sp,; Calliphoridae: Calliphora vicina‚ Chrysomya albiceps, Lucilia sericata, Calliphora vomitoria and Lucilia caesar; Sarcophagidae: Sarcophaga haemorrhoidalis and Sarcophaga sp. Chrysomya albiceps and Musca domestica were collected in all stages of decomposition. The first flies egg mass seen in fresh stage of decomposition belonged to Calliphora vicina species. Information from this study can be helpful in forensic entomology.
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Arabian Journal of Geosciences, Sep 1, 2018
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Materials
Rock is used as a foundation and building material in many engineering projects and it is importa... more Rock is used as a foundation and building material in many engineering projects and it is important to determine/predict its engineering properties before project construction. Petrographic and textural characteristics are useful parameters for predicting engineering properties of rocks in such applications. In this research, fifteen rock samples were taken and their engineering characteristics, namely dry and saturated unit weights, porosity, water absorption, slake durability index (SDI), Schmidt rebound hardness (SRH), ultrasonic P-wave velocity (UPV), and uniaxial compressive strength (UCS), were measured in the laboratory. Petrographic and textural characteristics of the rocks, determined from thin section and X-ray diffraction investigations, led to the evaluation of the texture coefficient (TC). Based on simple regression analysis (SRA), the TC values have direct relationships with density, SDI, SRH, UPV, and UCS, and inverse relationships with porosity and water absorption. ...
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Geotechnical and Geological Engineering
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Schmidt hammer is used for calculation of joint compressive strength and elasticity modulus of ro... more Schmidt hammer is used for calculation of joint compressive strength and elasticity modulus of rocks. Today, application of Schmidt hammer is a common method for evaluation of engineering properties of rocks. This method is quick, inexpensive and non-destructive which are benefits of this method. In this regard, different experimental equations proposed by Barton & Choubey (1977), Deere (1960), Kidybinski (1980), Aufmuth (1973) and ISRM (1981) can be employed in order to calculate the Joint Compressive Strength (JCS) of rocks. Due to the importance of this research, new experimental equations are introduced. Using this equations show a very good results in comparison with the results of other researchers. It should be noted that these equations are achieved from 827 records of Schmidt Hammer results from different types of hard rocks such as granite, diorite and hornfels from the Ganjnameh-Shahrestaneh road in south west of Hamedan province, west of Iran.
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Papers by Davood Fereidooni