------------------------------------------------------Abstract---------------------------------------------------------Estimation of strength properties (uniaxial compressive and point load) from physical properties (density, porosity and rebound hardness) of shale rock type from Kogi State, Nigeria was investigated. The shale rock types were sampled and tested for their properties through in-s...

Understanding the mechanism of progressive debonding bolts is great significance for underground safety. In this paper, both laboratory experiment and numerical simulation pull-out tests were performed. The experimental test specimens prepared using cement mortar material, a relationship between strength bolt uniaxial compressive (UCS) material specimen was established. locations crack develope...

Nine rock types including Sandstone, Limestone, Siltstone, Dolomite and Marl collected from six different rock formations of the Salt Range area of Pakistan were tested to evaluate the correlations between the uniaxial compressive strength and the corresponding values of the point load index. Two hundred rock cores were drilled and used for the uniaxial compressive strength and point load index...

Abstract: The present study investigates four materials, namely quartz, marble, quartzite and metasandstone and aims to establish correlations, with the use of simple and multiple regression analysis, between their properties and breakage rate parameters. The material properties considered in this study derived from the application of destructive and non-destructive tests and include P-wave vel...

Uniaxial compressive strength (UCS) is a significant parameter in mining engineering and rock engineering. The laboratory test time-consuming economically costly. Therefore, developing reliable accurate UCS prediction model through easily obtained parameters good way. In this paper, we set five input compare six hybrid models based on BP neural network swarm intelligence optimization algorithms...

Uniaxial compressive strength (UCS) is one of the most important parameters to characterize rock mass in geotechnical engineering design and construction. In this study, a novel kernel extreme learning machine-grey wolf optimizer (KELM-GWO) model was proposed predict UCS 271 samples. Four namely porosity (Pn, %), Schmidt hardness rebound number (SHR), P-wave velocity (Vp, km/s), point load (PLS...

The stability analysis of rock slopes is a complex task for the geotechnical engineers due to the complex nature of the rock mass in a tropical climate that often has discontinuities in several forms, and consequently, in several types of slope failures. In this work, a rock mass classification scheme is followed in a tropical environment using the Rock Mass Rating (RMR) and Geological St...

The determination of mechanical parameters historical mortars is a crucial aspect in the analysis masonry ancient buildings, especially for evaluating their quality and planning appropriate restoration interventions. Due to conservation reasons, creating comprehensive database generally not possible because cutting out specimens relates damaging structures. This study starts with need character...

A series of uniaxial and triaxial compression tests were performed on slate samples with different diameters at foliation orientations respect to the direction major principal stress. The size effect anisotropy in slate, as a transversely isotropic rock, investigated, research focused aspects elastic properties, compressive strength (UCS), (TCS), residual (TRS). In five constants for only Young...

Abstract The needle penetration index (NPI) test is a non-destructive that applicable both in the field and laboratory, does not require any special sample preparation. This has been used for estimation of physico-mechanical properties soft rocks. In this study, influence clay content on relation between uniaxial compressive strength (UCS) NPI investigated some clay-bearing tests were carried o...