This paper presents a geotechnical study whose
objective is to determine the lithology of the soil of Balterdi village (Matam,
Senegal). A bridge-type structure with six supports is to be built on the
studied site. The drilling program consisted of six core drillings (SC) each 30
m deep with sampling and six destructive drillings with pressuremeter tests
(SP) every 1.5 m up to 30 m deep. A pair of core and pressuremeter tests was carried
out under each support. From the results of the core drill holes and the
geological model of the site, it can be seen that the lithology of the soil
along the structure consists essentially of soft clay layers, becoming firm at
depth over the first 18 m on average (with some incursions of sandy layers)
resting on medium to compacted sand up to 30 m. Brown clayey fill is also
present between piers P3 and P5. The presence of a watercourse along the
structure is noted. The foundations will therefore be carried out in the water.
The results of the pressuremeter tests confirm the homogeneity of the soil over
the whole area. Indeed, the values obtained are almost similar for all the
tests. According to the limit pressures obtained, the clayey-sandy formations
encountered along the structure are respectively soft to firm and moderately
compact to compact. Their limit pressures are high enough to allow good bearing
capacities.
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