Articles and publications

Title: ALTERNATIVE FORMULA FOR ROCK GROUTING AND ITS APPLICATIONS
Description: ABSTRACT The target of this paper is to introduce author’s alternative formula for rock grouting and its applications. Formulas for maximum penetration and maximum pressure are presented as well as conditions of minimum grout cohesion. Formulas show the known fact that ground water pressure is the main reason for poor grouting result. Reduce of ground water pressure is important during grouting work. It’s preferable to use grouting formulas that describes better grouting and its geometry than known formulas that are based on mass balance in rectangular channel.
File: rock-grouting1.pdf
Size: 460 kB
Title: SIMPILIFIED MODEL FOR POST-CRACK BEHAVIOUR OF FIBER REINFORCED SHOTCRETE
Description: ABSTRACT The target of this study is to develop an analytical solution to post-crack behavior of fiber-reinforced shotcrete. It’s a part of private development project “analytical methods in rock engineering”. Some formulas are given for post-crack strength and post-crack flexural modulus of fiber- reinforced shotcrete. Constitutive equations are derived from material properties given in Eurocode 2 “Design of concrete structures”. Cross section properties and formulas for stress and strain are derived using guidelines of EC 2 and theory of plasticity. Analytical solution to ASTM-C1609 beam test, ASTM-C1550 Round Panel test and EN 14488-5 panel test are derived from know solutions of similar structures. Calculated results are compared with published test results.
File: post-crack-analysis1.pdf
Size: 4 MB
Title: MECHANICS OF SPRAYED CONCRETE
Description: Designing underground rock structures consists of two primary tasks. First task is designing dimension and shape of underground space. The second task is to define rock reinforcement. Primary rock reinforcement methods are rock bolting and shotcreting. Design and analysis of rock structures and reinforcement is nowadays based on numerical analysis by computer calculation and empirical tables. Formerly widely used analytical methods like falling block method or arch theory are almost forgotten in rock mechanics. Tables are half-empirical design methods. These methods provide useful supplement to analytical work in the beginning of the designing process, but tables don’t provide information on safety factor / state of security level of the rock structure. It’s highly recommended to use analytical methods in rock reinforcement design. The purpose of this paper is to provide a quick review on design and analysis of sprayed concrete by some practical and simple calculation methods for some common shotcrete design cases.
File: mechanis-of-sprayed-concrete1.pdf
Size: 2 MB