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首页> 外文期刊>Journal of Geology & Geophysics >Geotechnical Considerations in Shoreline Protection and Land Reclamation in Kula, Eastern Niger Delta
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Geotechnical Considerations in Shoreline Protection and Land Reclamation in Kula, Eastern Niger Delta

机译：尼日尔三角洲东部库拉的海岸线保护和土地开垦中的岩土注意事项

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The investigation is to determine the suitability of the study site for the design and construction of a shoreline protection and also carry out reclamation exercise at the adjoining lands. Nine (9) number boreholes were drilled to a maximum depth of 20.0 m below the existing ground level using a cable percussion rig and nine (9) numbers Cone Penetrometer Testing using 2.5 tonne CPT equipment. The lithology reveals intercalations of clay and sand in thin layers to a depth of 2.0 m below the existing ground level. Only borehole 3 revealed the clay layer to a depth of 5.0 m. Underlying this clay is a stratum of loose to medium dense sand and dense sand. The sand is well sorted grading from fine to medium as the borehole advances. The laboratory analysis showed that the silty clay has undrained shear strength of 48 kPa. The loose sand has a maximum SPT (N) value of 12 while the medium dense sand has maximum SPT (N) value of 28. Considering the nature of the intended structure, the anticipated load and the moderate compressibility of this near surface silty clay and the underlying loose silty sand, it is suggested that the cellar slab be supported by means of raft foundation founded within the clay layer. Where the proposed project precludes the use of raft foundation, pile foundation should be employed to transmit the anticipated load from the cellar slab to the underlying sand stratum and that such piles should be closed-ended, straight-shaft steel pipe piles driven into the sand stratum and all driven piles should undergo pile load test to confirm their working load and consequent estimated settlement.
机译：调查的目的是确定研究地点是否适合设计和建造海岸线保护设施，并在毗邻的土地上进行填海运动。使用电缆冲击钻机在现有地面以下钻了九（9）号钻孔，最大深度为20.0 m，并使用2.5吨CPT设备钻了九（9）号锥孔渗透仪测试。岩性揭示了薄层中粘土和沙子的夹层，其深度低于现有地面的2.0 m。仅钻孔3露出粘土层至5.0 m的深度。在该粘土的下面是疏松至中等致密砂和致密砂的地层。随着井眼的推进，砂子的分类从细到中等的分级。实验室分析表明，粉质粘土的不排水剪切强度为48 kPa。疏松砂的最大SPT（N）值为12，而中密度砂的最大SPT（N）值为28。考虑到预期结构的性质，这种近表层粉质粘土和混凝土的预期载荷和中等压缩性，在下面的松散粉质砂土中，建议通过在粘土层中建立的筏板基础来支撑地窖板。如果拟建项目不使用筏板基础，则应采用桩基础将预期的载荷从地窖板传递至下层砂层，并且此类桩应为封闭式直头钢管桩，打入砂土中地层和所有打入桩均应进行桩载荷测试，以确认其工作载荷并据此估算沉降。

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