Evaluation of the mechanical properties of fluvial coarsegrained soils from dynamic penetration test

Soil and rock properties are essential inputs for the design of geotechnical structures. But unlike man-made materials, the determination of the characteristic value is not simple, mostly because of the large space variability of the soils and rocks. In many cases, the large spatial variability makes it difficult to collect sufficient ground samples for further laboratory testing so that many tests are performed directly in the field. In Slovakia, the dynamic penetration test (DP) is, among others, a quite popular field test for soil investigation. From the measured data, it is possible to derive relative density (ID) shear (φ ef) and deformation (E def) parameters of coarse-grained soils. There are many available correlations between the DP results and geotechnical parameters. Therefore, it is necessary to choose the most appropriate one as it considerably affects the final evaluation. This paper shows the assessment of geotechnical parameters of coarse-grained fluvial soil from the DP results and presents the statistical determination of its characteristic values, which are furthermore compared with the nominal values used in Slovakia.

PSYCHOLINGUISTIC PROFILE OF MODERN STUDENTS OF ECONOMIC SPECIALTIES

Within the article some aspects of manifestation of linguistic, terminological, communicative-pragmatic, textual, discursive competencies of the psycholinguistic profile of specialists in economic sphere are characterized. The influence of personal traits of an preceptor-economist on the formation of linguistic personality of an emerging economist is determined. Scientific works are analyzed, which allow to define a linguistic personality as a personality expressed in language and through language; as a person who is a native speaker and communicator, a holder of communicative competence. There are three levels of language proficiency: verbal-semantic, linguocognitive, pragmatic, the boundaries between which are quite fragile, vague; they also determine the stages of formation of linguistic personality. The requirements to the economic competence of a specialist are determined, which ensure the appropriate level of language proficiency, as lexical units of the language system occupy a priority place in professional speech of economic specialists: economic terminology of narrow and wide use, professionalisms, socially marked vocabulary, etc. The intralinguistic reasons for the dynamic penetration of lexical borrowings into professional speech of modern economists in connection with the nominative necessity are analyzed. With all due respect to foreign language culture, economic experts themselves are increasingly advocating the ecology of professional language, trying to use at least sporadically synonymous Ukrainian equivalents to the borrowings. Important communicative features of professional speech have been determined: content, accuracy, consistency, concise presentation of thoughts, provability, correctness and appropriateness of the terms use, information saturation, purity of speech, expressiveness of diction, melodiousness. Thus, indicators of general cultural, linguistic, terminological competence of an economist are deep knowledge of features of economic terminology, theory and practice of speech influence, attentive attitude to specific vocabulary and professional terms. Formation of the psycholinguistic profile of the personality of a novice economist depends on the fundamental language training, example and influence of the personal traits of the preceptoreconomist. The language development of a modern students of economic specialties largely depends on the state support, but above all on their own desire for self-development and selfrealization.

Estimating Deformation Modulus and Bearing Capacity of Deep Soils from Dynamic Penetration Test

The dynamic penetration test (DPT) and the Menard pressuremeter test (PMT) have been widely used in geotechnical survey of deep soils for megadam foundations in western China. The DPT measures are not well utilized due to the lack of correction factors and of empirical relationships for deep soils. This study investigates the relationships between the corrected DPT blow counts ( N 120 ′ ), pressuremeter modulus (EPMT), limit pressure (pL), deformation modulus (E0), and bearing capacity (fak) derived from the PMT results. Meanwhile, a nonlinear regression model is developed to predict the DPT correction factor (a) based on the raw DPT blow counts (N120) and the rod length (L) by integrating the available correction factors for shallow gravelly soils suggested by the code provisions and the deep soil data in this work. It is concluded that the proposed DPT correction factors match well with the code suggestions and the new compiled dataset, and the corrected DPT blow counts can be used to reasonably predict the engineering properties of deep sand and clay soils. Although the proposed correlations need to be tested among different soil types and regions, the results shed the light on in situ geotechnical tests and data utilization for deep and thick overburden.