Velocity of propagation of elastic waves in rock, in relation to natural factors

Abstract

IN ROCK, IN RELATION TO NATURAL FACTORS V. D. Mittn and ~. I. Timofeev UDC 622.235:534.231 Various authors [1 -3, et al.] have published work on the velocity of propagation of elastic waves in rocks; however, this topic has not been studied in field (pit) conditions in the Donbass. In this connection, research has been carried out to determine the velocity of propagation of elastic longitudinal waves in rocks in the Donbass in relation to certain natural factors. The aim of the work was to give a method of estimating the elastic characteristics of the rocks on the basis of data on their densities and conditions of occurrence.

The impact of the mineral composition of Carboniferous claystones on the water-induced changes of their geomechanical properties

“…The lowering values of the parameters tested (Tab. 3) by the authors is consistent with other results obtained in Poland (Bukowska 2012, Bukowski & Bukowska 2012, Josh et al 2012, Małkowski et al 2014) and elsewhere (Mitin & Timofeev 1970, Hoek & Brown 1997, Josh et al 2012, Li et al 2012, Abd El Megeed, 2013, Labani & Rezaee 2015, Lyu et al 2015.…”

“…Earlier investigations of two of the current authors limited to the Łaziska Beds claystones (Małkowski et al 2014) showed much higher reduction (0.1-0.6R c ) of their strength values induced by water and similar to changes of the modulus of the linear elasticity. The results presented in the current paper are well comparable with those contained in several other papers on claystones: in Canada by Hoek and Brown (Hoek & Brown 1997) (strength fall by 30-90%), Australia (Labani & Rezaee 2015) (swelling -P V = 1-12%, and Rusia -the Ural region (Mitin & Timofeev 1970) (velocity of a longitudinal wave fall by only 10% after soaking).…”

“…Josh et al (2012) distinguished two groups of claystones: the weak ones, in which the longitudinal wave travels at 1100-3450 m/s, and the strong ones, in which this speed is higher -2430-4980 m/s. Mitin & Timofeev (1970) observed a lowering of the longitudinal wave velocity as much as 75% depending on the quantity of water adsorbed by claystones.…”

“…The average velocities of the longitudinal waves in the clayrocks range between 1100-5450 m/s (Mitin & Timofeev 1970, Kabiesz 1988, Hoek & Brown 1997, Yang, 2014, Lyu et al 2015. Josh et al (2012) distinguished two groups of claystones: the weak ones, in which the longitudinal wave travels at 1100-3450 m/s, and the strong ones, in which this speed is higher -2430-4980 m/s.…”