Quality Assessment of Bored Pile Foundations by a set of Nondestructive Testing Methods

On Stress State Measurements of Rock Massifs with Underground Facilities Convertible into Defense Shelters

“…The accumulated material on the study of stress fields by various methods (unloading methods, geological, geophysical, seismic, etc.) allows us to explain the nature of residual stresses [8]. Apparently, the main part of the residual stresses is due to the weight of the overlying strata that formed the stress field in remote geological periods.…”

“…The discrepancy between the actual work of the second-order massif and the work calculated for the massif as a whole will be the less the smaller is the coefficient of variation of the elastic characteristics, that is, when the difference is small (8) In particular, if the coefficient of variation of the elastic and deformation characteristics of first-order elements is minimal (equal to zero), then according to (2) and (5) (9) The more heterogeneous the structural characteristic of the massif, the greater is the importance of considering the variation in the properties of the constituent elements of the massif. A massif composed of homogeneous elements can be classified as a homogeneous one.…”

General Conditions for Estimation of Stress-Strain State of the Rock Massif for Objects of Civilian Potection

“…It is usually assessed using the long-term strength coefficient K dl , which characterises the degree of loading on the rock under which the rock can retain its carrying capacity within the specified time period. The coefficient K dl is used in shaft stability calculations [4,5].…”

“…Based on many studies [7,8], long-term strength coefficients K dl have been determined for a wide range of rock types (Table 1). However, all these data are not explicitly bound to a specific time interval.…”

The Influence of Friction Stir Welded Process Parameters of Aa2519-T62 on Joint Quality Defined by Non-Destructive Laser Amplified Ultrasonic Method and by Microstructure Analysis

“…It is very important to determine the proper joint-quality check method to ensure the required welded material properties. Ultrasound testing methods are useful in determining the internal quality of the material including internal and surface inclusions and defects [17][18][19]. This method is also useful for analysing material properties by measuring the shear wave velocities [20,21].…”