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| 1 | Cracks coalescence mechanism and cracks propagation paths in rock-like specimens containing pre-existing random cracks under compression显示文摘The mechanism of cracks propagation and cracks coalescence due to compressive loading of the brittle substances containing pre-existing cracks(flaws)was modeled experimentally using specially made rock-like specimens from Portland Pozzolana Cement(PPC).The breakage process of the specimens was studied by inserting single and double flaws with different inclination angles at the center and applying uniaxial compressive stress at both ends of the specimen.The first crack was oriented at 50° from the horizontal direction and kept constant throughout the analysis while the orientation of the second crack was changed.It is experimentally observed that the wing cracks are produced at the first stage of loading and start their propagation toward the direction of uniaxial compressive loading.The secondary cracks may also be produced in form of quasi-coplanar and/or oblique cracks in a stable manner.The secondary cracks may eventually continue their propagation in the direction of maximum principle stress.These experimental works were also simulated numerically by a modified higher order displacement discontinuity method and the cracks propagation and cracks coalescence were studied based on Mode I and Mode II stress intensity factors(SIFs).It is concluded that the wing cracks initiation stresses for the specimens change from 11.3 to 14.1 MPa in the case of numerical simulations and from 7.3 to 13.8 MPa in the case of experimental works.It is observed that cracks coalescence stresses change from 21.8 to 25.3 MPa and from 19.5 to 21.8 MPa in the numerical and experimental analyses,respectively.Comparing some of the numerical and experimental results with those recently cited in the literature validates the results obtained by the proposed study.Finally,a numerical simulation was accomplished to study the effect of confining pressure on the crack propagation process,showing that the SIFs increase and the crack initiation angles change in this case. | Hadi Haeri Kourosh Shahriar Mohammad Fatehi Marji Parviz Moarefvand | 2014 | Journal of Central South University2014，21，6： | 16 |
| 2 | Experimental study of post-peak behavior of bimrocks with high rock block proportions显示文摘Design and construction of engineering structures in geomaterials with block-in-matrix texture(referred as bimrock) such as conglomerates,breccias and agglomerates are challenging tasks for engineers.When dealing with these materials in important structures such as open pits with high walls and pillars of deep underground mines,understanding the complete stress-strain behavior,including post-peak region,is a formidable yet crucial engineering practice.To study the post-peak behavior of bimrocks,artificial specimens were fabricated with a mixture of rock blocks and a cementing agent.All the experiments were conducted under uniaxial compression using a servo-control testing machine.The results show that the specimens with the highest block proportion(around 90% by mass) showed a small decrease in stress with strain increment in the post-peak region.The specimens with lower block proportions were characterized by an approximately steep fall in stress and following to residual stress.Based on the study,it is inferred that all the artificial specimens undergo post-failure deformation and the type of post behavior depends on rock block proportions. | Mohammad Afifipour Parviz Moarefvand | 2014 | Journal of Central South University2014，21，2： | 4 |
| 3 | Experimental and numerical study of crack propagation and coalescence in pre-cracked rock-like disks显示文摘 | Hadi Haeri Kourosh Shahriar Mohammad Fatehi Marji Parviz Moarefvand | 2014 | International Journal of Rock Mechanics and Mining Sciences2014，，： | 2 |
| 4 | Triaxial creep tests and back analysis of time-dependent behavior of Siah Bisheh cavern by 3-Dimensional Distinct Element Method显示文摘 | S. Nadimi K. Shahriar M. Sharifzadeh P. Moarefvand | 2010 | Tunnelling and Underground Space Technology incorporating Trenchless Technology Research2010，，1： | 1 |
| 5 | Application of Number-Size (N-S) Fractal Model to Quantify of the Vertical Distributions of Cu and Mo in Nowchun Porphyry Deposit (Kerman, Se Iran)显示文摘 | Lili Daneshvar Saein Iraj Rasa Nematolah Rashidnejad Omran Parviz Moarefvand Peyman Afzal Behnam Sadeghi | 2013 | Archives of Mining Sciences2013，，1： | 1 |
| 6 | Mechanical behavior of bimrocks having high rock block proportion显示文摘 | AFIFIPOUR M MOAREFVAND P | 2014 | International Journal of Rock Mechanics and Mining Sciences2014，65，1： | 1 |
| 7 | Geochemical anoma- ly separation by multifractal modeling in Kahang (Gorgor) porphyry system,Central Iran显示文摘 | Afzal P Khakzad A Moarefvand P | 2010 | Journal of Geochemical Ex- ploration2010，104，： | 1 |
| 8 | Application of fractal mod- els to outline mineralized zones in the Zaghia iron ore deposit, Central Iran显示文摘 | Sadeghi B Moarefvand P Afzal P | 2012 | Journal of Geochemical Exploration2012，122，： | 1 |
| 9 | Mechanical Behavior of Bimrocks Having High Rock Block Proportion显示文摘 | AFIFIPOUR M MOAREFVAND P | 2014 | In- ternational Journal of Rock Mechanics & Mining Sci- ences2014，65，4： | 1 |
| 10 | Geochemical Anomaly Separation by Multifractal Modeling in Kahang (Gor Got) Porphyry System, Central Iran 显示文摘 | Afzal P Khakzad A Moarefvand P | 2010 | Journal of Geochemical Exploration2010，104，： | 1 |
| 11 | Application of the strain energy to estimate the rock load in squeezing ground condition of Eamzade Hashem tunnel in Iran显示文摘 | M. Soleiman Dehkordi K. Shahriar P. Moarefvand M. Gharouninik | 2013 | Arabian Journal of Geosciences2013，，4： | 1 |
| 12 | Gold anomaly ranking based on stream sediment geochemistry in the Fariman–Kashmar axis, NE Iran显示文摘One of the essential tasks accelerate the decision-making process in mineral exploration projects is ranking anomalous areas.In this study,we used fourteen geologic maps(at scale 1:100,000)in areas where systematic geochemical explorations were conducted in the Fariman-Kashmar axis in northeast Iran to conduct the anomaly ranking.On all these maps,samples were consistently prepared to be analyzed through statistical and geostatistical methods.At first,anomaly separation was carried out by fractal methods that resulted in the detection of 308 anomalous samples in 128 areas.These samples were classified into three groups of first,second,and thirdorder anomalies,whose number of anomalous samples were calculated based on this ranking technique.Three factors,including the average concentration of each anomaly,its surface area,and the number of its samples,were used to rank the areas.According to this technique,the maximum anomaly score obtained was 172 for the Taknar area,and the minimum score was 3 for several areas.To validate the ranking results,some exploration operations were carried out in some of these anomalous areas in which mining operations started later.Several significant gold anomalous areas were introduced,which is considered an important result of this study. | Hassan Azmi Parviz Moarefvand Abbas Maghsoudi | 2021 | Acta Geochimica2021，40，2： | 0 |
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