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| 1 | Numerical evaluation of strength and deformability of fractured rocks显示文摘Knowledge of the strength and deformability of fractured rocks is important for design, construction and stability evaluation of slopes, foundations and underground excavations in civil and mining engineering. However, laboratory tests of intact rock samples cannot provide information about the strength and deformation behaviors of fractured rock masses that include many fractures of varying sizes, orientations and locations. On the other hand, large-scale in situ tests of fractured rock masses are economically costly and often not practical in reality at present. Therefore, numerical modeling becomes necessary. Numerical predicting using discrete element methods(DEM) is a suitable approach for such modeling because of their advantages of explicit representations of both fractures system geometry and their constitutive behaviors of fractures, besides that of intact rock matrix. In this study, to generically determine the compressive strength of fractured rock masses, a series of numerical experiments were performed on two-dimensional discrete fracture network models based on the realistic geometrical and mechanical data of fracture systems from feld mapping. We used the UDEC code and a numerical servo-controlled program for controlling the progressive compressive loading process to avoid sudden violent failure of the models. The two loading conditions applied are similar to the standard laboratory testing for intact rock samples in order to check possible differences caused by such loading conditions. Numerical results show that the strength of fractured rocks increases with the increasing confning pressure, and that deformation behavior of fractured rocks follows elasto-plastic model with a trend of strain hardening. The stresses and strains obtained from these numerical experiments were used to ft the well-known Mohr-Coulomb(MC) and Hoek-Brown(H-B) failure criteria, represented by equivalent material properties defning these two criteria. The results show that both criteria can provide fair estimates of the compressive strengths for all tested numerical models. Parameters of the elastic deformability of fractured models during elastic deformation stages were also evaluated, and represented as equivalent Young's modulus and Poisson's ratio as functions of lateral confning pressure. It is the frst time that such systematic numerical predicting for strength of fractured rocks was performed considering different loading conditions, with important fndings for different behaviors of fractured rock masses, compared with testing intact rock samples under similar loading conditions. | Majid Noorian Bidgoli Zhihong Zhao Lanru Jing | 2013 | Journal of Rock Mechanics and Geotechnical Engineering2013，5，6： | 9 |
| 2 | Anisotropy of strength and deformability of fractured rocks显示文摘Anisotropy of the strength and deformation behaviors of fractured rock masses is a crucial issue for design and stability assessments of rock engineering structures,due mainly to the non-uniform and nonregular geometries of the fracture systems.However,no adequate efforts have been made to study this issue due to the current practical impossibility of laboratory tests with samples of large volumes containing many fractures,and the difficulty for controlling reliable initial and boundary conditions for large-scale in situ tests.Therefore,a reliable numerical predicting approach for evaluating anisotropy of fractured rock masses is needed.The objective of this study is to systematically investigate anisotropy of strength and deformability of fractured rocks,which has not been conducted in the past,using a numerical modeling method.A series of realistic two-dimensional(2D) discrete fracture network(DFN)models were established based on site investigation data,which were then loaded in different directions,using the code UDEC of discrete element method(DEM),with changing confining pressures.Numerical results show that strength envelopes and elastic deformability parameters of tested numerical models are significantly anisotropic and vary with changing axial loading and confining pressures.The results indicate that for design and safety assessments of rock engineering projects,the directional variations of strength and deformability of the fractured rock mass concerned must be treated properly with respect to the directions of in situ stresses.Traditional practice for simply positioning axial orientation of tunnels in association with principal stress directions only may not be adequate for safety requirements.Outstanding issues of the present study and suggestions for future study are also presented. | Majid Noorian Bidgoli Lanru Jing | 2014 | Journal of Rock Mechanics and Geotechnical Engineering2014，6，2： | 4 |
| 3 | Antistaphylococcal activity of Zataria muhiflora essential oil and its synergy with vancomycin显示文摘 | Mahboubi M Bidgoli FG | 2010 | Phytomedicine2010，17，7： | 1 |
| 4 | Comparison of dispersive liquid-liquid microextraction and hollow fiber liquidliquid-liquid microextraction for the determination of fentanyl,alfentanil,and sufentanil in water and biological fluids by high-performance liquid chromatography显示文摘 | Saraji M Khalili Boroujeni M Hajialiakbari Bidgoli AA | 2011 | Analytical and bioanalytical chemistry2011，400，7： | 1 |
| 5 | Dispersive Liquid-liquid Microextraction Using a Surfactant as Disperser Agent 显示文摘 | SARAJI M BIDGOLI A A H | 2010 | Anal Bioanal Chem2010，397，7： | 1 |
| 6 | Group Decision Support System显示文摘 | Bidgoli H | 1996 | Journal of System Management1996，14，1： | 1 |
| 7 | Progesterone receptor positive colorectal tumors have lower thymidine phosphorylase expression: an immunohistochemical study显示文摘 | Zavarhei MD Bidgoli SA Ziyarani MM | 2007 | Pak J Biol Sci2007，10，24： | 1 |
| 8 | Association between p53 expression and Bcl-2, P-glycoprotein, topoisomerase II alpha, thymidylate synthase and thymidine phosphorylase as potential therapeutic targets in colorectal cancer patients显示文摘 | Bidgoli SA Azizi E Zavarhei MD | 2007 | Pak J Biol Sci2007，10，19： | 1 |
| 9 | Role of hormonal and en-vironmental factors on early incidence of breast cancer in Iran显示文摘 | Bidgoli SA Ahmadi R Zavarhei MD | 2010 | Sci Total Environ2010，408，19： | 1 |
| 10 | Role of exogenous and endogenous sources of estrogen on the incidence of breast fibroadenoma: case- control study in iran显示文摘 | BIDGOLI S A EFTEKHARI T | 2011 | Asian Pacific Journal of Cancer Prevention2011，12，5： | 1 |
| 11 | Composition and antioxidant and antimicrobial activity of the essential oil and extracts of Stachys inflata Benth from Iran 显示文摘 | Ebrahimabadi A H Ebrahimabadi E H Djafari- Bidgoli Z | 2009 | Food Chemistry2009，，6： | 1 |
| 12 | Group decision support system显示文摘 | Hossein Bidgoli | 1996 | Journal of System Management1996，2，3： | 1 |
| 13 | Effect of carboxymethylation conditions on the water-binding capacity of chitosan-based super- absorbents显示文摘 | Bidgoli H Zamani A Taberzadeh M J | 2010 | Carbohydrate Research2010，345，18： | 1 |
| 14 | Group support system显示文摘 | Hossein Bidgoli | 1996 | J of Systems Management1996，47，4： | 1 |
| 15 | Comparison of dispersive liquid-liquid microextraction andhollow fiber liquid-liquid-liquid microextraction for the dete-rmination of fentanyl,alfentanil,and sufentanil in water andbiological fluids by high-performance liquid chromatogra-phy显示文摘 | Saraji M Khalili Boroujeni M Hajialiakbari Bidgoli AA | 2011 | Anal Bioanal Chem2011，400，7： | 1 |
| 16 | Group Support System 显示文摘 | Hossein Bidgoli | 1996 | Journal of Systems Management1996，，4： | 1 |
| 17 | A randomised trial com- paring sufentanil versus remifentanil for laparoscopic gastroplasty in the morbidly obese patient显示文摘 | Bidgoli J Delesalle S De Hert SG | 2011 | Eur J Anaesthesiol2011，28，2： | 1 |
| 18 | Role of hor- monal and environmental factors on early incidence of breast cancer in Iran显示文摘 | BIDGOLI S A AHMADI R ZAVARHEI M D | 2010 | Sei Total Environ2010，408，19： | 1 |
| 19 | Group decision support system显示文摘 | Bidgoli H | 1996 | Journal of System Management1996，14，1： | 1 |
| 20 | Determination of desipramine in biological samples using liquid–liquid–liquid microextraction combined with in‐syringe derivatization, gas chromatography, and nitrogen/phosphorus detection显示文摘 | Mohammad Saraji Narges Mehrafza Ali Akbar Hajialiakbari Bidgoli Mohammad Taghi Jafari | 2012 | Science2012，，19： | 1 |
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