Use of densification process to resolve soil deformation in Chlef city (Algeria)
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2ND CAJG 2019
Use of densification process to resolve soil deformation in Chlef city (Algeria) Zohra Boutaraa 1
&
Ahmed Arab 1 & Mohammed Chemmam 2 & Abdelkader Brahimi 3
Received: 13 May 2020 / Accepted: 22 September 2020 # Saudi Society for Geosciences 2020
Abstract Road pavements based on silty or sandy soils can undergo several deformations including settlements and liquefaction phenomenon that can occur in seismic zones. This paper focuses on the case of a section of the RN4 express road adjacent to Chellif River in Chlef city (Algeria), which is a prone area to seismic risk. This traffic lane continually suffers from serious deformations, mainly due to settlement occurring on the road pavement. Thus, a laboratory investigation is carried out to test the efficiency of the use of densification process on the improvement of Chlef silt-sandy soil’s mechanical properties. Samples representing the three soil states (loose, medium dense and dense) are tested using the triaxial apparatus in drained and undrained conditions and under both monotonic and cyclic loadings. The study results show a reduction of soil settlement and an increase of its resistance, both proportional to its density increase. These results indicate the efficiency of the densification process allowing its use to resolve soil deformations of the concerned road pavements and to avoid the soil liquefaction in case of a seismic event. Keywords Pavements deformation . Soil densification . Chlef silt-sandy soil . RN4 express road
Abbreviations B Skempton’s pore pressure coefficient Cu Coefficient of uniformity D Diameter of the triaxial sample Dr Relative density D1 Effective grain diameter D50 Mean grain size D C Dynamic compaction E Secant modulus emax Maximum void ratio
This paper was selected from the 2nd Conference of the Arabian Journal of Geosciences (CAJG), Tunisia 2019 Responsible Editor: Zeynal Abiddin Erguler * Zohra Boutaraa [email protected] 1
Laboratory of Material Sciences and Environment (LSME), Civil Engineering and Architecture Institute, Hassiba Benbouali University, Ouled Fares, 02000 Chlef, Algeria
2
Civil Engineering Institute, Ahmed Zabana University Centre, 48000 Relizane, Algeria
3
Civil Engineering Department, Abdelhafidh Boussouf University Centre, 43000 Mila, Algeria
emin H Ms Nc q RN4 U Δu σ′c σ′1 σ′3 ωL ωP IP εv ε1 φ
Minimum void ratio Height of the triaxial sample Seismic magnitude Number of cycles Deviator stress National express road n°4 Pore pressure Excess pore water pressure Confining pressure Effective major principal stress Effective minor principal stress Liquid limit Plastic limit Index of plasticity Volumetric strain Axial strain Friction angle
Introduction Soil reinforcement is nowadays frequently used in geotechnical engineering projects, such as in road and railway embankments construction and improvement of low mechanical quality and soft grounds. Among the soil reinforcement commonly
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used, soil densification processes allow the resolution of soils deformation proble
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