TY - JOUR AU - Somodi, Gábor AU - Bar, Neil AU - Török, Ákos AU - Vásárhelyi, Balázs TI - Empirical relationship between the Geological Strength Index (GSI) and rock mass quality (Q-system) in granite and sedimentary rocks JF - BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT J2 - B ENG GEOL ENVIRON VL - 84 PY - 2025 IS - 6 PG - 11 SN - 1435-9529 DO - 10.1007/s10064-025-04303-1 UR - https://m2.mtmt.hu/api/publication/36120306 ID - 36120306 N1 - This research was funded by Budapesti Műszaki és Gazdaságtudományi Egyetem (BME), grant number 2020 2 1 1 ED 2023 00239 “Doktoranduszi Kiválósági Ösztöndíj Program.” Open access funding provided by Budapest University of Technology and Economics. AB - This paper presents the relationship between Rock Mass Quality (Q-system) and the Geological Strength Index (GSI) parameters. Equations are suggested based on field data and calculations of the empirical results of granitic rock masses (Hungary) and siltstones, sandstones and quartzite formations (Australia). Measured and calculated GSI values vs Q values are given for granitic rocks, showing a higher correlation than that of the sedimentary rocks of Australia. The different behaviors of rock masses explain the higher correlation between GSI vs Q and GSI chart vs GSI calculated for igneous rock bodies. Despite the differences in stress fields and the highly tectonised structural geological setting of the granitic rock mass, the isotropic nature of granitic rocks vs. anisotropy of sedimentary rock bodies is reflected in the correlation coefficients. LA - English DB - MTMT ER - TY - JOUR AU - Tarifard Karvigh, Abolfazl AU - Török, Ákos AU - Görög, Péter TI - Fractional Derivative-based Burger Creep Model for Soft Rocks and its Verification Using Tunnel Monitoring Results and Experimental Data JF - ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING J2 - ARAB J SCI ENG PY - 2025 PG - 12 SN - 2193-567X DO - 10.1007/s13369-024-09740-w UR - https://m2.mtmt.hu/api/publication/35562896 ID - 35562896 N1 - Published online: 2024 Correspondence Address: Tarifard, A.; Department of Engineering Geology and Geotechnics, Műegyetem Rkp. 3, Hungary; email: abolfazl.tarifard.karvigh@emk.bme.hu Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA, TKP-6-6/PALY-2021 Funding text 1: The support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme (project no. TKP-6-6/PALY-2021), is acknowledged. AB - Considering the creep behavior of soft and weak rocks is critical for analyzing the long-term stability of underground constructions. This paper introduces a novel creep constitutive model to characterize the creep behavior of rocks under uniaxial and triaxial stress states. The fractional derivative Abel dashpot was used to improve the Burger model, and a viscoplastic component was added in series with the modified Burgers model to replicate the tertiary phase of rock creep. The effectiveness of the model was verified using creep test data from various soft rocks and monitoring measurements from a tunnel excavated in heavily jointed weak rock masses. Furthermore, a sensitivity analysis was carried out to assess the impact of the model parameters on creep deformation, and a comparative study was performed to evaluate the efficacy of the suggested model in modeling the accelerated stage of rock creep compared with some existing models. The strong agreement observed between the calculated results and both the creep test data and tunnel monitoring measurements underscores the accuracy and validity of the proposed model. The comparative analysis further revealed that the proposed model offers the highest fitting efficiency for describing the tertiary stage of rock creep. These findings suggest that the model effectively captures the creep behavior of rocks and precisely represents the entire creep process. LA - English DB - MTMT ER - TY - JOUR AU - Varró, Richárd Imre AU - Török, Ákos AU - Görög, Péter TI - Historic Stone Masonry arch Bridges: Materials and Numerical Modelling of Failure Modes JF - GEOHERITAGE J2 - GEOHERITAGE VL - 17 PY - 2025 IS - 2 PG - 17 SN - 1867-2477 DO - 10.1007/s12371-025-01085-6 UR - https://m2.mtmt.hu/api/publication/35860315 ID - 35860315 N1 - Funding Agency and Grant Number: Budapest University of Technology and Economics [TKP2021-NVA, TKP-6-6/PALY-2021]; Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund Funding text: The support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme (project no. TKP-6-6/PALY-2021). AB - This study examined eight different vaulted stone bridges with 1-2-3-4 spans. On-site measurements were conducted to assess the main characteristics of the bridges, including geometric dimensions, the types, main properties of the stones used, and the existing damages. Various laboratory tests were performed on samples taken from the bridges. Using the data obtained, numerical analyses were carried out to determine the load-bearing capacity of the structures. How the existing structural damages affect the load-bearing values was investigated. Depending on the type and extent of the damage, the reduction in load-bearing capacity can range from just a few percent to as much as 90%. It was revealed that the most significant factors affecting load-bearing capacity are the geometric dimensions and the frictional interaction between the elements. LA - English DB - MTMT ER - TY - JOUR AU - Zomborácz, Tamás AU - Somodi, Gábor AU - El Qurany, Sayed AU - Török, Ákos TI - Rock Mass Characterization and Non-destructive In-situ Testing of a Rock-cut Tomb: Theban Necropolis (Egypt) JF - PERIODICA POLYTECHNICA-CIVIL ENGINEERING J2 - PERIOD POLYTECH CIV ENG VL - 69 PY - 2025 IS - 2 SP - 519 EP - 528 PG - 10 SN - 0553-6626 DO - 10.3311/PPci.37653 UR - https://m2.mtmt.hu/api/publication/35805233 ID - 35805233 N1 - Published online: 2025-02-10 Funding Agency and Grant Number: National Scientific Research Fund of Hungary (OTKA) [DKOP-23, 2020-2.1.1-ED-2023-00239]; Tempus Public Foundation Funding text: The financial support of the doctoral fellowship DKOEP-23 to Tamas Zomboracz (grant no. 2020-2.1.1-ED-2023-00239) is acknowledged. The fieldwork in the area would have been impossible without the support of the National Scientific Research Fund of Hungary (OTKA) and the research scholarship granted by Tempus Public Foundation. We are grateful for the help of Zoltan Imre Fabian, who is the field director of the Hungarian Archaeological Mission working in the area of TT 184 in Thebes. AB - The current study describes the engineering geological properties of a rock-cut tomb that is located near Luxor, forming a part of the Theban necropolis in Egypt. The studied Theban Tomb no. 25 (TT 25) was excavated during the New Kingdom and served as a funeral site. The host limestone belongs to the Late Paleocene Tarawan Chalk Formation. The site investigations included the detection of the joint system, the measurements of relative humidity and temperature cycles, and moisture content. The rock mass parameters were also outlined considering the strength (obtained from Schmidt hammer rebounds) and the orientation and frequency of joints. Five joint sets were identified: three sub-vertical and one bedding-controlled sub-horizontal. The results of temperature, relative humidity, and moisture content measurements support the observations, namely that salts accumulate at the sloping passage and burial chamber, where higher humidity provokes salt efflorescence. LA - English DB - MTMT ER - TY - CHAP AU - Bartakovics, Edina AU - Török, Ákos TI - Mérnökgeológiai terepi megfigyelések a tervezett M0 autópálya északkeleti, Budakalász és Solymár közötti szakaszán T2 - Mérnökgeológia-Kőzetmechanika 2024 PB - BME Geotechnika és Mérnökgeológia Tanszék T3 - Mérnökgeológia és Kőzetmechanika Kiskönyvtár, ISSN 1789-0454 ; 27. PY - 2024 SP - 49 EP - 58 PG - 10 UR - https://m2.mtmt.hu/api/publication/35646347 ID - 35646347 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Besharatinezhad, Ali AU - Török, Ákos TI - Numerical simulation of P and S wave propagation in porous and low porosity carbonate rocks: laboratory tests, automatic P and S waves detection and FLAC3D simulation JF - BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT J2 - B ENG GEOL ENVIRON VL - 83 PY - 2024 IS - 8 PG - 14 SN - 1435-9529 DO - 10.1007/s10064-024-03817-4 UR - https://m2.mtmt.hu/api/publication/35159591 ID - 35159591 N1 - Export Date: 5 August 2024 Correspondence Address: Török, Á.; Department of Engineering Geology and Geotechnics, Muegyetem rkp 3, Hungary; email: torok.akos@emk.bme.hu Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA, K 116532 Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA Funding text 1: The research was partly funded by project no. BME-NVA-02 (Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation Fund), under the TKP2021 funding scheme. The same office provided support from a research grant to \\u00C1.T (ref. no. K 116532), which is also appreciated. AB - This study presents laboratory measurements of P and S wave velocities of two carbonate rocks (porous limestone and yellow cemented limestone). The experimental results were validated and compared with the numerical simulation outputs using the 3D Fast Lagrangian Analysis of Continua software (FLAC3D). The main aim of this study is to evaluate the effect of frequency and mode of emission on ultrasonic pulse velocity (UPV) by applying an automatic method for the determination of P and S wave velocities. Based on the results, automatic detection of UPV can provide reliable outputs. The difference between numerical simulation results and laboratory measurement in terms of P and S wave velocities was, on average, around 7%, suggesting the applicability of the automatic detection method. Our study implies less noise in the perfect shear (PS) mode than in the single zone (SZ) emission mode. In summary, higher frequencies and the PS mode of emission are recommended. © The Author(s) 2024. LA - English DB - MTMT ER - TY - JOUR AU - Besharatinezhad, Ali AU - Török, Ákos TI - The Effect of Freeze-thaw on Mechanical and Ultrasonic Properties of Hungarian Oolitic Stones JF - PERIODICA POLYTECHNICA-CIVIL ENGINEERING J2 - PERIOD POLYTECH CIV ENG VL - 68 PY - 2024 IS - 3 SP - 1013 EP - 1020 PG - 8 SN - 0553-6626 DO - 10.3311/PPci.23268 UR - https://m2.mtmt.hu/api/publication/34962189 ID - 34962189 N1 - Export Date: 15 July 2024 Correspondence Address: Török, Á.; Department of Engineering Geology and Geotechnics, Műegyetem rkp. 3, Hungary; email: torok.akos@emk.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Fradj, Nourhen AU - Török, Ákos AU - Kádár, István TI - Biopolymers in geotechnical engineering for soil improvement JF - POLLACK PERIODICA: AN INTERNATIONAL JOURNAL FOR ENGINEERING AND INFORMATION SCIENCES J2 - POLLACK PERIODICA VL - 19 PY - 2024 IS - 2 SP - 82 EP - 86 PG - 5 SN - 1788-1994 DO - 10.1556/606.2023.00937 UR - https://m2.mtmt.hu/api/publication/34962272 ID - 34962272 AB - Several biopolymer applications in geotechnical engineering have been adopted in recent years, notably dust control, soil strengthening, and erosion control. Although biopolymer soil treatment approaches can assure engineering efficiency while satisfying environmental protection standards, this technology requires more validation regarding site adaptability, durability, and economic feasibility. The influence of biopolymers on soil behavior is discussed within geotechnical engineering applications and practices, including soil consistency limits, strength and deformation parameters, hydraulic conductivity, soil-water properties, and erosion prevention. LA - English DB - MTMT ER - TY - CHAP AU - Haas, János AU - Brezsnyánszky, Károly AU - Budai, Tamás AU - Fodor, László AU - Gál, Nóra Edit AU - Gombárné, Forgács G AU - Gyalog, L AU - Katona, G AU - Kovács, G AU - Kövér, Szilvia AU - Lesták, F AU - Nádor, Annamária AU - Nagymarosy, A AU - Prakfalvi, Péter AU - Rotárné Szalkai, Ágnes AU - Scharek, P AU - Síkhegyi, F AU - Szepessy, G AU - Szőcs, Teodóra AU - Török, Ákos AU - Vatai, J AU - Vikor, Zs AU - Zilahi-Sebess, László József ED - Kocsis, Károly ED - Gercsák, Gábor ED - Horváth, Gergely ED - Keresztesi, Zoltán ED - Nemerkényi, Zsombor TI - Földtan T2 - Magyarország nemzeti atlasza 2. kötet. Természeti környezet PB - HUN-REN CSFK Földrajztudományi Intézet CY - Budapest SN - 9789639545656 PY - 2024 SP - 16 EP - 35 PG - 20 UR - https://m2.mtmt.hu/api/publication/35738597 ID - 35738597 N1 - utánközlés (angol nyelvi változat) LA - Hungarian DB - MTMT ER - TY - JOUR AU - Józsa, Sándor AU - Pintér, Farkas AU - Török, Ákos AU - Heinrich-Tamaska, Orsolya Mariann TI - Habarcsok a Keszthely-fenékpusztai késő római erődből: a petrográfiai-geokémiai és mérnökgeológiai vizsgálatok eredményei [Mortar samples from the Late Roman fortress of Keszthely-Fenékpuszta: results of petrographic-geochemical and engineering geological analyses] JF - ARCHEOMETRIAI MŰHELY J2 - ARCHEOMETRIAI MŰHELY VL - 21 PY - 2024 IS - 2 SP - 161 EP - 182 PG - 22 SN - 1786-271X DO - 10.55023/issn.1786-271X.2024-014 UR - https://m2.mtmt.hu/api/publication/34763422 ID - 34763422 N1 - in Hungarian with English abstract AB - The Roman fortress of Keszthely-Fenékpuszta, built in the 4th century AD, was located at the western edge of Lake Balaton on a peninsula bordered by open water and marshy peat bogs. The well-protected fortification played a significant infrastructural role, due to the fact that the lake could be crossed here along a main north-south road of Pannonia. Archaeological excavations started in 2009 had the primary goal to clarify the location, floor plan and dating of individual buildings (nos. 24, 25 and 27). Based on petrographic, geochemical, and engineering geological investigations of mortars used in the constructions, we were able to gain insight into the possibilities of answering certain archaeological questions with geoarchaeometric methods. Mortar samples were systematically collected from the different locations representing the functions and construction phases. Based on the archaeological research three chronological groups (I.-III: end of 3rd c. to early 7th c. AD) were distinguished; two of them belong to the late Roman Period (I.-II.) and one (III.) to the Migration Period. The aggregates of the mortars were analyzed by polarized light microscopy and thermoanalytical method. The chemical examination of the binder was carried out by scanning electron microscopy. Additionally, water absorption, density and compressive strength of the mortars were also determined. Based on the results, we can conclude that the mortars of all three periods are of air lime nature containing Mg and Si impurities and both the binders and additives were produced using local raw materials rich in dolomite components. The higher compressive strength values of the mortars of the 3rd period (late 5th to early 7th c. AD) are probably due to the slightly different composition of the binder, or they can also be explained by the static role of the selected pillars. © by the author(s) LA - English DB - MTMT ER -