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Analysis of using the empirical model of organic soil consolidation to predict settlement

Meyer Zygmunt, Olszewska Magdalena A.

Architecture Civil Engineering Environment

2023

Vol. 16, no. 2

111--117

The paper describes two models for determining the constrained elasticity modulus of organic soils based on the settlement of an overloading embankment. In these methods, based on the settlement of the embankment of the load exerted on the subsoil, using the inverse problem, it is possible to determine the constrained modulus. A parameter determined in this way can also be determined during consolidation. Changes in the settlement at successive stages of consolidation can be used to determine the constrained modulus of the organic soil at a given point in time. Assuming a “temporarily stable” (quasi-stationary) state at each analysed stage of consolidation. The constrained elasticity modulus was determined for the settling at a given moment. constrained modulus tests of organic soils were carried out for two embankments previously described in the literature. In this case, the modulus was also analysed during consolidation. These embankments are founded on peat and peat-gyttja substrates. In both cases, the layer of organic soil was 4 m. The presented methods with the assumption of a one-dimensional state of deformation, despite the state of spatial stress, can be used during construction using the “design and build” technology. The constrained modulus determined from the embankment overload will represent the actual deformations – volumetric deformations (including other deformations that actually occurred) during the consolidation period. The paper was concluded with several conclusions.

Interpretation of CPT and SDMT tests for Lublin loess soils on the example of Cyprysowa research site

Nepelski Krzysztof

Budownictwo i Architektura

2019

Vol. 18, nr 3

63--72

This paper presents an example of interpretation of in situ tests, CPT static sounding and seismic Marchetti dilatometer tests (SDMT). The studies were carried out on loess soils in Lublin. Four CPT tests and four SDMT seismic tests were performed. The method of deriving geotechnical parameters from in situ testing was described. In particular, the formulas for calculating the constrained modulus based on the cone resistance qc were analysed. Some of the parameters were interpreted with the use of proposed formulas. Values of deformation parameters determined with various methods for different strain ranges were compared.