Mustafa Fener

The usability of the Cerchar abrasivity index for the evaluation of the triaxial strength of Misis Fault Breccia

The development of some predictive models for the geomechanical properties of fault breccias will be useful for geo-engineers, because the preparation of smooth specimens from the fault breccias is usually tedious and expensive. In this study, simple and multiple regression analysis were applied to the data pertaining to Misis Fault Breccia to develop predictive models for the differential stress (Δσ) from non-destructive methods including the Cerchar abrasivity index (CAI). As a result of simple regression analysis, strong relations between Δσ and indirect properties were not found. The CAI was included in the best multiple regression model for the prediction of Δσ. The significance of derived models was statistically tested. It was concluded that the CAI is a useful property for the prediction of Δσ of Misis Fault Breccia.

A preliminary study on the conversion factor used in the prediction of the UCS from the BPI for pyroclastic rocks

Preparing desired smooth specimens from pyroclastic rocks is difficult and time consuming for some standard tests such as uniaxial compressive strength (UCS) test, since they are weak or soft rocks. For this reason, the development of some equations is important for predicting the UCS of pyroclastic rocks. A linear correlation was suggested for the prediction of UCS from block punch index (BPI) test for a wide range of rock in the literature. The UCS–BPI conversion factor for this correlation is 5.1. In this study, the relation between UCS and BPI was investigated for pyroclastic rocks. Twenty-eight different samples of pyroclastic rocks were collected from the Cappadocia Region of Turkey. The UCS and BPI tests were carried out on the oven-dried samples in the laboratory. The test results were analyzed using the method of least squares regression. The linear regression analysis showed that the UCS–BPI conversion factor for the tested rocks was 3.1. This value is fairly lower than the suggested value. On the other hand, the correlation coefficients of power law functions are higher than that of the linear functions. Concluding remark is that the UCS–BPI conversion factor for the pyroclastic rocks is lower than the suggested general conversion factor and the UCS–BPI relation is best represented by the power law function.

An assessment on the indirect determination of the volumetric block proportion of Misis fault breccia (Adana, Turkey)

Volumetric block proportion (VBP) directly affects the strength of geologically complex rocks such as bimrocks (block-in-matrix rocks). Since the direct determination of VBP is difficult in most cases, some prediction methods were suggested. In this study, the VBP of Misis fault breccia, which is a type of bimrock, was determined by image analysis techniques and its predictability from P- and S-wave velocity, and density was investigated. Regression analysis showed that there is no relation between VBP and S-wave velocity. However, there is a weak relation between VBP and P-wave velocity. On the other hand, VBP was strongly correlated with density. It was concluded that P- and S-wave velocity may not be a measure of VBP of breccias. However, density is a good measure of VBP, because the relation between VBP and density is strong and statistically significant.

ENDÜSTRİYEL TABAN KÜLÜ ATIĞI İÇEREN KİL TUĞLA ÜRETİMİ

Sanayi tesislerinde taban kulu, komurun yanmasi ile ortaya cikan endustriyel bir artiktir. Soz konusu artigin kullanim alanin cok kisitli olmasi nedeni ile cevresel bir sorun olarak guncelligini korumaktadir. Bu nedenle, komur yakan tesislerde artik miktarinin azaltilmasi ve mevcut artiklarin degerlendirilmesi icin bircok arastirma yapilmaktadir. Ozellikle soz konusu artiklarin yapi teknolojisinde kullanilabilirligi yonunde umit verici gelismelerin oldugu bilinen bir gercektir. Bu calismada; %20’ye varan oranlarda yanmamis karbon iceren, Nigde Bor Şeker Fabrikasinin taban kulunun tugla uretiminde katki maddesi olarak kullanilabilirligi arastirilmistir. Sonucta, soz konusu taban kulunun, tugla uretiminde katki malzemesi olarak kullanilabilecegi ve atigin degerlendirilmesinde iyi bir alternatif oldugu belirlenmistir.

Estimating the Wet-Rock P-Wave Velocity from the Dry-Rock P-Wave Velocity for Pyroclastic Rocks

Seismic methods are widely used for the geotechnical investigations in volcanic areas or for the determination of the engineering properties of pyroclastic rocks in laboratory. Therefore, developing a relation between the wet- and dry-rock P-wave velocities will be helpful for engineers when evaluating the formation characteristics of pyroclastic rocks. To investigate the predictability of the wet-rock P-wave velocity from the dry-rock P-wave velocity for pyroclastic rocks P-wave velocity measurements were conducted on 27 different pyroclastic rocks. In addition, dry-rock S-wave velocity measurements were conducted. The test results were modeled using Gassmann’s and Wood’s theories and it was seen that estimates for saturated P-wave velocity from the theories fit well measured data. For samples having values of less and greater than 20%, practical equations were derived for reliably estimating wet-rock P-wave velocity as function of dry-rock P-wave velocity.