Verification of Field Settlement of In-situ Stabilized Dredged Sediments Using Cone Penetration Test Data

 

Gregory Paul Makusa

PhD Student
Department of Civil, Environmental and Natural resources engineering, Luleň University of Technology, Tel: +46 920 491688, SE ľ 971 87, Luleň, Sweden
e-mail: gregory.makusa@ltu.se

Hans Mattsson

Assistant Professor
Department of Civil, Environmental and Natural resources engineering, Luleň University of Technology, Tel: +46 920 492147, SEľ971 87, Luleň, Sweden
e-mail: hans.mattsson@ltu.se

Sven Knutsson

Professor
Department of Civil, Environmental and Natural resources engineering, Luleň University of Technology, Tel: +46 920 491332, SEľ971 87, Luleň, Sweden
e-mail: sven.knutsson@ltu.se

 

 ABSTRACT

Utilization of in-situ mass stabilization for geotechnical applications is increasing. Laboratory tests may have drawbacks on valuations of engineering parameters for estimations of settlement of in-situ stabilized soil mass. Factors such as compression, mixing work, homogeneity and curing temperature may influence the differences in mechanical properties between laboratory test results and achieved field values. Therefore, utilization of appropriate in-situ mechanical parameters may be required during design analyses. Various in-situ tests are available for use in geotechnical context. Among others, cone penetration test (CPT) is one of most widely used in-situ tests. Numerous CPT empirical correlations are available for use in conventional soils. Utilization of such CPT empirical correlations for in-situ stabilized soils has to be examined. In this paper, the in-situ constrained modulus was evaluated using conventional CPT empirical correlation and utilized as oedometer modulus in finite element analysis for estimation of settlement of preloaded in-situ stabilized dredged sediments. The results show that, computed settlement values fall within the range of measured one. These findings suggest that, the cone penetration test and its empirical correlations, which were established for conventional soils, can also be utilized in stabilized soils.

Keywords: field settlement, cone penetration test, in-situ constrained modulus, finite element method, PLAXIS, in-situ stabilization, contaminated dredged sediments, preloading

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