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Evaluation of the state of sandy soils on a sinkhole area with the use of noninvasive (MASW) and invasive (SDMT) tests

Szajna W. S.

Engineering Transactions

2015

Vol. 63, iss. 1

109--131

The subject of the study is to assess the state of soil in the area of a former shallow underground mining site which presents a potential hazard of sinkholes. Two kinds of tests were performed i.e. noninvasive seismic tests MASW and invasive seismic dilatometer tests SDMT. The test procedures and the used equipment are described in the paper. The MASW tests allowed the detection of shallow and deep seismic anomalies – places with reduced mechanical parameters. Shallow anomalies were subjected to SDMT tests. Stiffness parameters were adopted as a measure of the state of soil. The applied consistent methodology allowed for the assessment of soil stiffness for intermediate and very small strains. It has been shown that the shallow anomalies were not caused by sinkhole processes. The values of stiffness for intermediate and very small strains in the zone above shallow anomalies occurred to be inconsistent, suggesting the influence of cementation or desiccation processes.

Applicability of SDMT test in evaluating the modulus G in tailings

Gogolik S., Waliński M., Marchetti D.

Studia Geotechnica et Mechanica

2007

Vol. 29, nr 1-2

39-46

The value of an initial shear modulus G is essential for a safe use of objects subjected to dynamic loads. Such a situation occurs at the Żelazny Most dump where paraseismic activities are due to copper ore mining. The paper presents the results of field investigation with seismic cone SCPTU and a latest generation of seismic dilatometer SDMT, Dutch company A.P. van den Berg. The aim of the tests was to estimate the applicability of the latter through statistical analysis of results acquired from both methods. The values of constrained moduli derived from CPTU and DMT tests are also compared.