New Approach for Characterization and Mitigation of the Swelling Phenomenon

Frontiers in Built Environment

Sergio Andrew Manigniavy¹  Dalel Azaiez¹  Mounir Bouassida¹  Yosra Bouassida² 

[1] Université de Tunis El Manar, Ecole Nationale d’Ingénieurs de Tunis, LR14ES03 Laboratoire d’Ingénierie Géotechnique et Géorisque, Tunis, Tunisia;Université de Tunis, Ecole Nationale Supérieure d’Ingénieurs de Tunis, Département de Génie Civil, Tunis, Tunisia;

关键词: expansive clay;    characterization;    granular material;    swelling pressure;    mitigation;    oedometer test;   

DOI  :  10.3389/fbuil.2022.836277

来源: DOAJ

【 摘 要 】

This article first introduces a new method of characterization of expansive clays after oedometer test results performed on intact saturated clay specimens. On the presumed expansive clays specimens, oedometer tests are preceded by the free swelling test from which the swelling pressure is measured. From current oedometer test results carried out on expansive and non-expansive clays, the ratio of compression index (Cc) by the swelling index (Cs) was determined. A threshold value of the ratio Cc/Cs was identified to distinguish between expansive clay specimens and non-expansive clay specimens. Second, a novel mitigation method of the swelling phenomena was validated by performing oedometer tests on expansive clay specimens preceding the measurement of swelling pressure. Oedometer tests performed on a 53% thickness clay specimen overlaid by a 47% thickness of sand showed a significant reduction of the swelling pressure compared to that measured on a full expansive clay specimen. The mitigation solution reduced the swelling effect by placing a compacted granular layer as an interface between the expansive clay and the foundation. This solution has been adopted and approved in forthcoming a lightweight building construction at the Faculty of Sciences of Tunis City.

【 授权许可】

Unknown