Determination of the Parameters of the Natural Stress State of Clay Soils by a Probe with a Lateral Stress Module

Cone penetration testing of soils with probes equipped with additional sensors and devices makes it possible to simultaneously perform two or more different types of soil tests in the conditions of their natural bedding in the express mode, without additional costs and increasing the duration. Such probes include a tip with an additional lateral pressure module (usually includes full and pore pressure sensors). The article presents the results of experimental studies on the use of lateral stress measurements by the LS-module to determine the parameters of the natural stress state of clay soils (the coefficient of lateral pressure at rest, the effective pre-compaction stress, the over-compaction stress, the overconsolidation ratio, the natural total and effective horizontal stress in the soil). In the experiments, a LS-module with three pairs of sensors located in areas with different diameters was used. The results of a statistical analysis of the relationships between the LS-module parameters (twenty-six direct and derived types were considered) and the natural stress state of clay soils are presented. It is shown that the coefficient of lateral pressure at rest, the overconsolidation ratio, the natural effective horizontal stress in the soil are determined with the greatest accuracy. The empirical dependences recommended for practical use in geotechnical surveys and calculations, including in software packages implementing numerical methods (PLAXIS, MIDAS GTS, Z-Soil, etc.) are given.

O.N. ISAEV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
R.F. SHARAFUTDINOV, Candidate of Sciences (Engineering)
D.S. ZAKATOV, Master

Research Institute of Bases and Underground Structures (NIIOSP) named after N.M. Gersevanov, JSC “Research Center of Construction” (59, Ryazansky Avenue, Moscow, 109428, Russian Federation)

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