ORCID Profile
0000-0002-8139-1079
Current Organisations
Curtin University
,
Kyushu University
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Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 04-2009
Publisher: Springer Science and Business Media LLC
Date: 07-06-2013
Publisher: Elsevier BV
Date: 2010
Publisher: Elsevier BV
Date: 10-2015
Publisher: Springer Science and Business Media LLC
Date: 26-11-2016
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 02-2022
Publisher: Springer Science and Business Media LLC
Date: 14-03-2016
Publisher: Emerald
Date: 07-03-2016
Abstract: – The purpose of this paper is to find a convenient contact detection algorithm in order to apply in distinct element simulation. – Taking the most computation effort, the performance of the contact detection algorithm highly affects the running time. The algorithms investigated in this study consist of Incremental Sort-and-Update (ISU) and Double-Ended Spatial Sorting (DESS). These algorithms are based on bounding boxes, which makes the algorithm independent of blocks shapes. ISU and DESS algorithms contain sorting and updating phases. To compare the algorithms, they were implemented in identical ex les of rock engineering problems with varying parameters. – The results show that the ISU algorithm gives lower running time and shows better performance when blocks are unevenly distributed in both axes. The conventional ISU merges the sorting and updating phases in its naïve implementation. In this paper, a new computational technique is proposed based on parallelization in order to effectively improve the ISU algorithm and decrease the running time of numerical analysis in large-scale rock mass projects. – In this approach, the sorting and updating phases are separated by minor changes in the algorithm. This tends to a minimal overhead of running time and a little extra memory usage and then the parallelization of phases can be applied. On the other hand, the time consumed by the updating phase of ISU algorithm is about 30 percent of the total time, which makes the parallelization justifiable. Here, according to the results for the large-scale problems, this improved technique can increase the performance of the ISU algorithm up to 20 percent.
Publisher: IEEE
Date: 09-2007
Publisher: Springer Science and Business Media LLC
Date: 21-04-2011
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2014
Publisher: Springer Science and Business Media LLC
Date: 27-07-2010
Publisher: Informa UK Limited
Date: 09-2013
Publisher: Springer Science and Business Media LLC
Date: 23-10-2010
Publisher: Science Alert
Date: 05-2009
Publisher: Springer Science and Business Media LLC
Date: 15-05-2009
Publisher: Elsevier BV
Date: 09-2009
Publisher: MDPI AG
Date: 20-01-2021
DOI: 10.3390/APP11030924
Abstract: As mining depth extends continuously, complex geological environment and strong mining stress pose serious challenges against excavation safety and higher demand for bolt support. To meet the challenges, a new type of flexible bolt is developed that is free from the limitation of excavation height and can be installed quickly. The flexible bolts have a tail structure which is squeezed together by the locking casing and the steel-strand rod. The tail structure forms the thread through the rolling process, and then can be quickly installed by the nut rotation type, which avoids the disadvantages of the cable tension installation. Through the flexible long bolts, the thick anchoring layer of the roof can be constructed, and the safety control of the roadway is realized. To obtain the optimal specifications, locking casings of three diameters and lengths were used to prepare bolt s les for static tensile test. Test results show that when the diameter of locking casing is fixed, the peak resistance increases as the length of locking casing increases, but the increased litude tends to reduce gradually. When the length of locking casing is fixed, too large a diameter makes the mechanical property unstable. Finally, the optimal length and diameter of locking casing are set at 120 and 30 mm, respectively. In addition, cyclic loading tests were conducted, the results of which indicate that cyclic loading does not change the stress state within the bolts and that flexible bolts display a stable mechanical property. Field results indicate that flexible bolts achieve low damage of the surrounding rock and control the maximum roof fracture depth within 2.1 m, thus guaranteeing the roadway safety.
Publisher: Elsevier BV
Date: 12-2010
Publisher: Springer Science and Business Media LLC
Date: 05-01-2012
Publisher: American Geophysical Union (AGU)
Date: 02-2014
DOI: 10.1002/2013WR014610
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 02-2013
Publisher: Springer Science and Business Media LLC
Date: 14-05-2013
Publisher: Springer Science and Business Media LLC
Date: 17-10-2006
Publisher: Elsevier BV
Date: 02-0012
Publisher: Springer Science and Business Media LLC
Date: 06-05-2011
Publisher: Elsevier BV
Date: 05-2008
Publisher: Springer Science and Business Media LLC
Date: 2014
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 07-2013
Publisher: Elsevier BV
Date: 07-2010
Publisher: Elsevier BV
Date: 2016
Publisher: AIP Publishing
Date: 03-2020
DOI: 10.1063/1.5143906
Abstract: The response of rock mass to engineering activities related to environment greatly depends on the scale of rock mass. Therefore, the scale dependency of rock mechanical behavior under different rock mass conditions is investigated in this research. As a crucial parameter, the volume of the block provides a fundamental understanding to define the rock mass condition and possible mechanical response. In this paper, at first, a systematic approach to calculate the block size distribution (BSD) based on the natural fracture parameters using most suitable distribution functions was established with the R language. Then, the rock mass parameters were extracted from core mapping in the depth of 1500 m–2000 m and the BSD was presented in a similar manner to soil particle size distribution. Finally, the rock mass behavior under different block sizes was investigated. The results showed that Vb25 = 3.4 dm3, Vb50 = 6.4 dm3, and Vb75 = 11.2 dm3, which were the average percentages to represent the BSD. In the research area, therefore, the fractured rock mass was dominated by minor blocks. Besides, the variation of rock mass deformation vs BSD showed that the fractured rock mass was aggravated with the decrease in the block size. The results will enhance the effect of BSD on rock mass mechanical properties.
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 03-2014
Publisher: Informa UK Limited
Date: 20-06-2017
Publisher: MDPI AG
Date: 28-07-2021
DOI: 10.3390/GEOSCIENCES11080319
Abstract: The rock slope stability analysis can be performed using deterministic and probabilistic approaches. The deterministic analysis based on the safety concept factor uses fixed representative values for each input parameter involved without considering the variability and uncertainty of the rock mass properties. Probabilistic analysis with the calculation of probability of failure instead of the factor of safety against failure is emerging in practice. Such analyses offer a more rational approach to quantify risk by incorporating uncertainty in the input variables and evaluating the probability of the failure of a system. In rock slope engineering, uncertainty and variability involve a large scatter of geo-structural data and varied geomechanical test results. There has been extensive reliability analysis of rock slope stability in the literature, and different methods of reliability are being employed for assessment of the probability of failure and the reliability of a slope. Probabilistic approaches include Monte Carlo simulation (MCS), the point estimate method (PEM), the response surface method (RSM), first- and second-order reliability methods (FORMs and SORMs), and the first-order second-moment method (FOSM). Although these methods may be complicated, they provide a more complete definition of risk. Probabilistic slope stability analysis is an option in most commercial software however, the use of this method is not common in practice. This paper provides an overview of the literature on some of the main probabilistic reliability-based methods available for the design of the rock slope in open pit mining. To demonstrate its applicability, the paper investigates the stability of a rock slope in an open pit mine in the Goldfields region, Western Australia. Two different approaches were adopted: deterministic stability analysis using two-dimensional limit equilibrium and finite element shear strength reduction methods using SLIDE and RS2 software, respectively, and probabilistic analysis by applying the MCS and RSM methods in the limit equilibrium method. In this ex le, the slope stability analysis was performed using the Spencer method with Cuckoo search optimization to locate the critical slip surface. The results obtained were compared and commented on.
Publisher: Springer Science and Business Media LLC
Date: 05-2017
Publisher: IEEE
Date: 02-2011
Publisher: Elsevier BV
Date: 04-2013
Publisher: Springer Science and Business Media LLC
Date: 11-2016
Publisher: Springer Science and Business Media LLC
Date: 27-08-2016
Publisher: Elsevier BV
Date: 03-2012
Publisher: Informa UK Limited
Date: 03-2013
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 09-2013
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 03-2011
Location: Iran (Islamic Republic of)
No related grants have been discovered for Mostafa Sharifzadeh.