Rock Type Identification Using Analysis of the Acoustic Signal Frequency Contents Propagated While Drilling Operation     

Khoshouei  Mehrbod  Bagherpour  Raheb  Jalalian  Mohammad Hossein 《Geotechnical and Geological Engineering》2022,40(3):1237-1250

Geotechnical and Geological Engineering - One of the most important parameters specially in mining and oil drilling fields is the type of rocks. It is important to determine that rock structure is...  相似文献   

Developing the Rule of Thumb for Evaluating Penetration Rate of TBM,Using Binary Classification     

Akbarzadeh  Mohammadreza  Shaffiee Haghshenas  Sina  Jalali  Seyed Mohammad Esmaeil  Zare  Shokrollah  Mikaeil  Reza 《Geotechnical and Geological Engineering》2022,40(9):4685-4703

Geotechnical and Geological Engineering - Using the tunnel boring machine (TBM) in tunneling projects contributes significantly to increased efficiency and reducing the time of project...  相似文献   

Compilation simulation of surface water and groundwater resources using the SWAT-MODFLOW model for a karstic basin in Iran     

Salmani  Haniyeh  Javadi  Saman  Eini  Mohammad Reza  Golmohammadi  Golmar 《Hydrogeology Journal》2023,31(3):571-587

Modeling of karstic basins can provide a better understanding of the interactions between surface water and groundwater, a more accurate estimation of infiltrated water amount, and a more reliable water balance calculation. In this study, the hydrological simulation of a karstic basin in a semiarid region in Iran was performed in three different stages. In the first stage, the original SWAT model was used to simulate surface-water flow. Then, the SWAT-MODFLOW conjunctive model was implemented according to the groundwater characteristics of the study area. Finally, due to the karstic characteristics of the region and using the CrackFlow (CF) package, the SWAT-MODFLOW-CF conjunctive model was developed to improve the simulation results. The coefficient of determination (R²) and the Nash-Sutcliffe efficiency coefficient (NSE) as error evaluation criteria were calculated for the models, and their average values were 0.63 and 0.57 for SWAT, 0.68 and 0.61 for SWAT-MODFLOW, 0.73 and 0.7 for SWAT-MODFLOW-CF, respectively. Moreover, the mean absolute error (MAE) and root mean squared error (RMSE) of the calibration for groundwater simulation using the SWAT-MODFLOW model were 1.23 and 1.77 m, respectively. These values were 1.01 and 1.33 m after the calibration of the SWAT-MODFLOW-CF model. After modifying the CF code and keeping the seams and cracks open in both dry and wet conditions, the amount of infiltrated water increased and the aquifer water level rose. Therefore, the SWAT-MODFLOW-CF conjunctive model can be proposed for use in karstic areas containing a considerable amount of both surface water and groundwater resources.

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Facies Analysis and Sequence Stratigraphy of Silurian Carbonate Ramps in the Turan (Kopeh-Dagh) and Central Iran Plates with Emphasis on Gondwana Tectonic Event     

Zohreh NOWROUZI  Asadollah MAHBOUBI  Reza MOUSSAVI-HARAMI  Mohammad Hossein MAHMUDY GHARAIE  Farzin GHAEMI 《《地质学报》英文版》2015,89(4):1276-1295

Two sections from the Silurian deposits in the Central Iran Micro and Turan Plates were measured and sampled. These deposits are mostly composed of submarine volcanic rocks, skeletal and non-skeletal limestone, shale and sandstone that were deposited in low to high energy conditions (from tidal flat to deep open marine). According to gradual deepening trend, wide lateral distribution of facies as well as absence of resedimentation deposits, a depositional model of a homoclinal ramp was proposed for these deposits. Field observations and facies distribution indicate that, two depositional sequences were recognized in both sections. These sections show similarities in facies and depositional sequence during the Early Silurian in the area. Although there are some opinions and evidences that demonstrated Paleo-Tethys rifting phase started at the Late Ordovician-Early Silurian, similarities suggest that the Turan and Iran Plates were not completely detached tectonic block during this time, and that their depositional conditions were affected by global sea level changes and tectonic events.  相似文献   

Agricultural land partitioning model based on irrigation efficiency using a multi‐objective artificial bee colony algorithm     

Mehrdad Bijandi  Mohammad Karimi  Bahman Farhadi Bansouleh  Wim van der Knaap 《Transactions in GIS》2021,25(1):551-574

In the process of agricultural land consolidation, the land parcels are optimally redesigned and rearranged in such a way that the dimensions of the resulting parcels are proportional to agricultural criteria such as irrigation discharge, soil texture, and cropping pattern. Besides these criteria, spatial factors like slope, road accessibility, volume of earthwork, and geometrical factors such as size and shape of parcels are also included in the design process of agricultural land partitioning. In this study, a land partitioning model was proposed using a multi‐objective artificial bee colony algorithm (MOABC‐LP) taking into consideration the mentioned factors. Initially, a feasible dimension range of parcels in a block was calculated based on irrigation efficiency. Two partitioning layouts were defined according to the topography and geometry of blocks. The proposed method was applied to a real study area and the results suggest that the land partitioning plan obtained by the MOABC‐LP model, in comparison with a designer's plan, not only makes the shape and size of parcels more compatible with the topographical and agricultural conditions of each block, but also reduces their cut‐and‐fill ratio.  相似文献   

Inverse modelling for freshwater lens in small islands: Kish Island,Persian Gulf     

Behzad Ataie‐Ashtiani  Mohammad Mahdi Rajabi  Hamed Ketabchi 《水文研究》2013,27(19):2759-2773

A number of challenges including instability, nonconvergence, nonuniqueness, nonoptimality, and lack of a general guideline for inverse modelling have limited the application of automatic calibration by generic inversion codes in solving the saltwater intrusion problem in real‐world cases. A systematic parameter selection procedure for the selection of a small number of independent parameters is applied to a real case of saltwater intrusion in a small island aquifer system in the semiarid region of the Persian Gulf. The methodology aims at reducing parameter nonuniqueness and uncertainty and the time spent on inverse modelling computations. Subsequent to the automatic calibration of the numerical model, uncertainty is analysed by constrained nonlinear optimization of the inverse model. The results define the percentage of uncertainty in the parameter estimation that will maintain the model inside a user‐defined neighbourhood of the best possible calibrated model. Sensitivity maps of both pressure and concentration for the small island aquifer system are also developed. These sensitivity maps indicate higher sensitivity of pressure to model parameters compared with concentration. These sensitivity maps serve as a benchmark for correlation analysis and also assist in the selection of observations points of pressure and concentration in the calibration process. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

Holocene and Pleistocene pluvial periods in Yemen,southern Arabia     

Dominik Fleitmann  Stephen J. Burns  Marek Pekala  Augusto Mangini  Abdulkarim Al-Subbary  Mohammad Al-Aowah  Jan Kramers  Albert Matter 《Quaternary Science Reviews》2011,30(7-8):783-787

Arabia is an important potential pathway for the dispersal of Homo sapiens (“out of Africa”). Yet, because of its arid to hyper-arid climate humans could only migrate across southern Arabia during pluvial periods when environmental conditions were favorable. However, knowledge on the timing of Arabian pluvial periods prior to the Holocene is mainly based on a single and possibly incomplete speleothem record from Hoti Cave in Northern Oman. Additional terrestrial records from the Arabian Peninsula are needed to confirm the Hoti Cave record. Here we present a new speleothem record from Mukalla Cave in southern Yemen. The Mukalla Cave and Hoti Cave records clearly reveal that speleothems growth occurred solely during peak interglacial periods, corresponding to Marine Isotope Stages (MIS) 1 (early to mid-Holocene), 5.1, 5.3, 5.5 (Eemian), 7.1, 7.5 and 9. Of these humid periods, highest precipitation occurred during MIS 5.5 and lowest during early to middle Holocene.  相似文献   

A new closed‐form solution for analysis of unlined pressure tunnels under seepage forces     

Ahamad Fahimifar  Mohammad Reza Zareifard 《国际地质力学数值与分析法杂志》2013,37(11):1591-1613

In this study, a simplified analytical closed‐form solution, considering plane strain and axial symmetry conditions, for analysis of a circular pressure tunnel excavated underwater table, is developed. The method accounts for the seepage forces with the steady‐state flow and is based on the generalized effective stress law. To examine the effect of pore pressure variations and also the boundary conditions at the ground surface, the formulations are derived for different directions around the tunnel. The proposed method can be applied for analysis and design of pressure tunnels. Illustrative examples are given to demonstrate the performance of the proposed solution and also to examine the effect of seepage forces on the stability of tunnels. The simplified analytical solution derived in this study is compared with numerical analyses. It is concluded that the classic solutions (Lame's thick‐walled solution), considering the internal pressure as a mechanical load applied to the tunnel surface, are not applicable to pervious media and can result in an unsafe design. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

Three‐dimensional finite element study of arching behavior in slope/drilled shafts system     

Robert Y. Liang  Mohammad Yamin 《国际地质力学数值与分析法杂志》2010,34(11):1157-1168

Two‐dimensional slope stability analysis for a slope with a row of drilled shafts needs a mechanism to take into account the three‐dimensional effect of the soil arching due to the spaced drilled shafts on slope. To gain a better understanding of the arching mechanisms in a slope with evenly spaced drilled shafts socketed into a stable stratum (or a rock layer), the three‐dimensional finite element modelling technique was used for a comprehensive parametric study, where the nonlinear and plastic nature of the soil and the elastic behavior of the drilled shafts as well as the interface frictions were modelled. Various factors were varied in the parametric study to include (1) the rigidity of the drilled shafts as influenced by its diameter, modulus of elasticity, and total length; (2) shafts spacing and location on the slope; (3) the material properties of rock and the socket length of shaft; and (4) the soil movement and strength parameters. Evidences of soil arching and reduction in the stresses and displacements through the load transfer mechanisms due to the presence of the drilled shafts were elucidated through the finite element method (FEM) simulation results. Design charts based on regression analysis of FEM simulation results were created to obtain a numerical value of the load transfer factor for the arching mechanism provided by the drilled shafts on the slope. Observations of the arching behavior learned from the FEM simulations provide an insight into the behavior of drilled shafts stabilized slope. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

Alkaline character of Eocene volcanism in the middle part of central Iran and its geodynamic situation     

Sayed Mehdi Amidi  Mohammad Hashem Emami  Robert Michel 《International Journal of Earth Sciences》1984,73(3):917-932

Alkaline volcanic rocks, sometimes feldspathoid bearing, appear in variable stratigraphic positions within the Eocene of the middle part of Central Iran. No magmatic zonation and no K₂O enrichment in both time and space can be found in this volcanic sequence. These facts together with other geochemical and geological features of the Iranian Eocene provinces do not agree with a volcanism related to a subduction zone model.Reversely, a rift model may be applied for the interpretation of the origin of Eocene volcanic rocks and their geodynamic situation. The emissions of alkaline magma are linked with rhythmic opening of a rift zone during Eocene.A mutual contamination between a basaltic magma and a bulky palingenetic acid magma is responsible for the few volcanic rocks with calc-alkaline trend.

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Zusammenfassung Alkali-Gesteine, die manchmal Feldspatoide enthalten, treten in verschiedenen stratigraphischen Stellungen innerhalb des Eozäns des Zentral-Irans auf.In diesen Vulkaniten ist keinerlei magmatische Zonierung und insbesondere keine systematische Variation der Kaligehalte festzustellen. Diese und andere geologische und geochemische Argumente sprechen gegen eine Deutung als Paläosubduktionszone.Als Alternative bietet sich das Modell der Öffnung eines Grabens an: der Alkali-Vulkanismus steht in Zusammenhang mit den verschiedenen Phasen der Entstehung und Entwicklung eines Rifts während des Eozäns.Die seltenen Vulkanite kalk-alkalischer Zusammensetzung erklären sich durch Mischung der Magmen von Alkali-Basalten mit den bedeutenden anatektischen Magmen.

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Résumé Des roches alcalines, éventuellement à feldspathoïde, existent à des niveaux et dans des secteurs variés de la séquence volcanique éocène de la partie médiane de la zone de l'Iran Central; par ailleurs, dans cette série, on n'a pu mettre en évidence ni zonation magmatique, ni enrichissement en K₂O. Ces faits, joints à d'autres caractères géochimiques et géologiques des provinces éocènes de l'Iran, sont en désaccord avec un volcanisme lié à une zone de subduction.En revanche, un modèle de rift peut être appliqué pour interpréter l'origine des volcanites éocènes et leur situation géodynamique. Les émissions de magma alcalin sont en effet en relation avec l'ouverture rhythmique d'une zone de rift pendant l'Eocène.Quant aux rares roches à tendance calco-alcaline, elles résultent d'une contamination mutuelle entre un magma basaltique et un important magma acide palingénétique.

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