TAILIEUCHUNG - Strength Analysis in Geomechanics Part 2

Tham khảo tài liệu 'strength analysis in geomechanics part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 6 1 Introduction Main Ideas Fig. . Decomposition of stress p The base of a structure is a part of the massif where stresses depend on the structure erected. It differs from a foundation that transfers the structure weight to the base. The boundary of the latter is a surface where the stresses are negligible. All the artificial soil massifs embankments dams etc. are not the bases they are structures. Stresses in the massif under external loads differ from their real meanings on values of the soil self-weight components. These so-called natural pressures depend on a specific weight Ye of the soil a coordinate z of the point and the depth of an underground water. The natural pressure is determined by relation ơ Yez Y z where Y is the specific weight of the soil with the consideration of its suspension by the underground waters z is the depth of the point from their mirror. Normal stresses on vertical planes are determined as dy tp z. Here z v 1 v is the factor of lateral soil expansion and V - the Poisson s ratio. Settling of Soil Phases of Soil State An elastic solution shows that with a growth of a load an a punch plastic deformation begins at its edges. Then inelastic zones expand according to the plastic solution. Experiments confirm this picture if we suppose that the 7 Main Properties of Soils Fig. . Zones of stress state under punch part of the soil districts a b in Fig. acts together with the punch. At the same time the expansion of the soil upwards zones c in the figure takes place and slip lines appear in zones b. This phenomenon was observed by . Kourdumov in his tests. Professor . Gersewanov proposed to consider three stages of the base state at the growth of the load 1 its condensation 2 an appearance of the shearing displacements and 3 its expansion. By these processes a condensed solid core zone a in the figure takes place and it moves together with the punch making additional plastic districts. Settling of Earth Layer of .

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