The estimation of uniaxial compressive strength conversion factor of trona and interbeds from point load tests and numerical modeling

2017-07-01
The point load (PL) test is generally used for estimation of uniaxial compressive strength (UCS) of rocks because of its economic advantages and simplicity in testing. If the PL index of a specimen is known, the UCS can be estimated using conversion factors. Several conversion factors have been proposed by various researchers and they are dependent upon the rock type. In the literature, conversion factors on different sedimentary, igneous and metamorphic rocks can be found, but no study exists on trona. In this study, laboratory UCS and field PL tests were carried out on trona and interbeds of volcano-sedimentary rocks. Based on these tests, PL to UCS conversion factors of trona and interbeds are proposed. The tests were modeled.numerically using a distinct element method (DEM) software, particle flow code (PFC), in an attempt to guide researchers having various types of modeling problems (excavation, cavern design, hydraulic fracturing, etc.) of the abovementioned rock types. Average PFC parallel bond contact model micro properties for the trona and interbeds were determined within this study so that future researchers can use them to avoid the rigorous PFC calibration procedure. It was observed that PFC overestimates the tensile strength of the rocks by a factor that ranges from 22 to 106.
JOURNAL OF AFRICAN EARTH SCIENCES

Suggestions

Estimation of the uniaxial compressive strength of trona and interburden rocks using the point load test results and numerical modeling
Altınpınar, Mehmet; Öztürk, Hasan; Department of Mining Engineering (2016)
Point load (PL) test is used as an index for rock strength classification. It is generally used for estimation of uniaxial compressive strength (UCS) because of its economic advantages and simplicity in testing. If the PL index of a specimen is known, the UCS can be estimated according to some conversion factors. Several conversion factors have been proposed by different researchers and are dependent upon the rock type. In the literature, conversion factors on different sedimentary, igneous and metamorphic ...
A Study of structural design based on optimality
Tamkan, Durukan; Tarman, Işık Hakan; Department of Mechanical Engineering (2019)
Topology optimization is one of the most powerful tool that designers use to reduce weight and cost in aerospace industry. However, traditional manufacturing techniques limit the oncoming advantages of topology optimization. New manufacturing techniques change the philosophy of topology optimization nearly dismissing the limits of manufacturing. Additive manufacturing not only adjoins complex shapes to design but also adjoins porous/lattice structures. In the first part of the thesis, a boarding step is opt...
The Effect of structural layout on the supersonic flutter characteristics of a fighter wing
Okumuş, Başak; Kayran, Altan; Department of Aerospace Engineering (2018)
The increase in flexibility of modern aircraft structures requires the aeroelastic effects be taken into consideration from the very beginning of the design phase in order to escape expensive iterations during the subsequent design phases and lower the required weight penalties resulting from compliance to certain aeroelastic requirements. Therefore, to be able to predict the supersonic flutter velocity is important in the preliminary design phase of fighter aircraft to increase design efficiency. In the fi...
AN EXPERIMENTAL AND NUMERICAL STUDY OF BALLISTIC PERFORMANCE OF SFRC STRUCTURES
Aleessa Alam, Burhan; Toksoy, Kaan; Dara, Gokce; Göktepe, Serdar; Yaman, İsmail Özgür (2016-05-13)
This contribution is concerned with the experimental and numerical study of ballistic performance of steel fiber reinforced concrete structures. For this purpose, three different types of panels, made of steel fiber reinforced concrete (SFRC), slurry-infiltrated concrete (SIFCON), and ceramic composite (CC), have been tested under high velocity impact of a rigid projectile. Explicit Finite Element analyses aiming at capturing the experimental residual velocities for the SFRC and SIFCON panels have also been...
The Development and Performance Characterization of Turbine Prototypes for a MEMS Spirometer
GOREKE, Utku; HABİBİABAD, Sahar; Azgın, Kıvanç; Serinağaoğlu Doğrusöz, Yeşim; Beyaz, Mustafa Ilker (2016-02-01)
The design, optimization, and performance characterization of turbine prototypes for the development of a Microelectromechanical Systems spirometer is reported. Four different turbines were designed based on large-scale Savonius turbine architecture. The number of turbine blades was optimized through finite-element simulations to maximize the induced moment and rotational speed at normal breathing flow rates. The turbines were manufactured and tested for their speed performance with respect to input flow ra...
Citation Formats
H. Öztürk, “The estimation of uniaxial compressive strength conversion factor of trona and interbeds from point load tests and numerical modeling,” JOURNAL OF AFRICAN EARTH SCIENCES, pp. 71–79, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34413.