ASSESSMENT OF SHEAR STRENGTH PARAMETERS OF SEDIMENTARY INTACT ROCK SPECIMENS AS A FUNCTION OF DEGREE OF SATURATION
Keywords:Shear strength, Rock, Saturation, Uniaxial strength
Rock cracks are the end consequence of a masses of the rock failing in tension, shear, or a amalgamation of the two. Depending on how the machinery works that created the fissures and some of the rock, two forms of fissure morphology—dry or saturated fissures—may be visible (water-filled fissures). The goal of the current work is to develop a connection between the strength characteristics of intact rock specimens and the variation in water content. A new mathematical method was developed to find the relationship between cohesion (c), angle of internal friction (f), uniaxial compressive strength (UCS), and the degree of saturation variation. A series of experimental tests were carried out on (100) intact rock specimens collected from the Ayoun al-Shajij region which is located West of Najaf province central of Iraq. According to the Mohr-Coloumb failure criterion, a new expression was developed to find the relationship between the shear strength parameters and water content of rock samples. According to the results, there is a linear and exponential relationship between increasing rock saturation and a reduction in the parameters of the shear strength (c and f). In order to link the cohesiveness and angle of friction to the rock's saturation level, new expressions have been found to be useful. While the angle of internal friction demonstrated a negative linear association with the degree of saturation, the cohesion demonstrated a negative important relation with the increase in saturation point.