Peat stratigraphy mapping using ground penetrating radar and geotechnical engineering implications

  • Authors

    • Adekunle Adepelumi Obafemi Awolowo University
    • John Akindulureni Obafemi Awolowo University
    • Christian Agih Obafemi Awolowo University
    • Babakayode Olubodun Obafemi Awolowo University
    • Isaac Evinemi Obafemi Awolowo University
    2014-09-03
    https://doi.org/10.14419/ijag.v2i2.3267

  • Abstract

    Ground Penetrating Radar (GPR) surveys was carried out in southwestern part of Lagos, Nigeria with a view of delineating the subsurface peat stratigraphy that would aid geotechnical engineering design of the appropriate soil stability processes . The GPR study was conducted along seven (7) parallel traverses trending E-W using the GSSI SIR-3000 200MHz monostatic shielded antenna. The mineralogy, micro-fabrics and morphology of the delineated stratigraphy was determined using the scanning electron microscope (SEM) and X-Ray diffraction (XRD) methods. The results obtained revealed the presence of five subsurface geological layers, distinct geomorphological features, and high, moderate and low amplitudes, to continuous and discontinuous planar radar facies structures. Borehole information confirms the occurrence of shallow peat and plastic clay layers beneath the area. SEM and XRD analyses of the field samples obtained showed the dominance of kaolinite, illite and quartz minerals in the clay/peat mapped. The derived engineering parameters suggest that the peats found in the area are fibrous peat with low strength and medium to low bedding stress. It is observed that the peat generally depict high compressibility value and low shear modulus. Our findings confirm the efficacy and relevance of GPR technique for pre-construction engineering investigations.

    Keywords: Compressibility, GPR, Mineralogy, Peat Stratigraphy, Soil Stability.

  • References

    1. Adegoke OS, Jeje LK, Durotoye B, Adeleye A & Ebukanson EE (1980) The Geomorphology and aspects of sedimentology of coastal region of Western Nigeria. Journal of Mining and Geology 17, 217-223.
    2. Adepelumi AA, Fayemi O & Akindulureni J (2013) Geophysical Mapping of Subsurface Stratigraphy beneath a River Bed Using Ground Penetrating Radar: Lagos Nigeria Case Study. Universal Journal of Geoscience 1, 1, 10-19.
    3. Adepelumi AA & Fayemi O (2012) Joint application of ground penetrating radar and electrical resistivity measurement for characterization of subsurface stratigraphy in Southwestern Nigeria. Journal of Geophysics and Engineering, 9, 2, 397-412. http://dx.doi.org/10.1088/1742-2132/9/4/397.
    4. Adepelumi AA & Olorunfemi MO (2000) Engineering geological and geophysical investigation of the reclaimed Lekki Peninsula, Lagos, Southwest Nigeria. Bulletin of Engineering Geology and the Environment, 58, 2, 125-132. http://dx.doi.org/10.1007/s100640050006.
    5. Anon O (1993) without site investigation ground is a hazard. Site investigation in construction, Part 1. Report of the Site Investigation Steering Group, Institution of Civil Engineers, Thomas Telford, London, 23-40.
    6. ASTM D6432-11 (2011) Standard Guide for Using the Surface Ground Penetrating Radar Method for subsurface investigation. 1 - 18.
    7. Chang, C, Zoback, MD & Khaksar, A (2006) Empirical relations between rock strength and physical properties in sedimentary rocks. Journal of Petroleum Science and Engineering, 51, 223–237. http://dx.doi.org/10.1016/j.petrol.2006.01.003.
    8. Cortellazzo, G & Cola, S (1999) Geotechnical Characteristics of Two Italian Peats Stabilized with Binders. Proceeding of Dry Mix Methods for Deep Soil Stabilization, 93-100.
    9. Duraisamy, Y, Huat, BB, & Aziz, AA (2007) Engineering Properties and Compressibility Behavior of Tropical Peat Soil. American Journal of Applied Sciences, 4, 10, 768-773. http://dx.doi.org/10.3844/ajassp.2007.768.773.
    10. Hebib, S & Farrell, ER (1999) Some Experiences of Stabilizing Irish Organic Soils. Proceeding of Dry Mix Methods for Deep Soil Stabilization, 81-84.
    11. Huat, B (2004) Organic and Peat soil Engineering Kuala Lumpur", University Putra Malaysia. 1-30.
    12. Jones, HA & Hockey, RD (1964) The Geology of part of Southwestern Nigeria. Geological Survey of Nigeria, 31, 10-34.
    13. Kazemian, S, Huat, B, Prasad, A & Barghchi, M (2011) A State of Art Review of Peat: Geotechnical Engineering Perspective. International Journal of Physical Sciences, 6, 8, 1974-1981.
    14. Kim, JH, Cho, SJ & Yi, MJ (2007) Removal of ringing noise in GPR data by signal processing. Geosciences Journal, 11, 1, 75 – 81. http://dx.doi.org/10.1007/BF02910382.
    15. Lal, M, (1999) Shale stability: drilling fluid interaction and shale strength. SPE 54356, presented at SPE Latin American and Caribbean Petroleum Engineering Conference, Caracas, Venezuela, 21–23 April. Tulsa, OK.
    16. Landva, AO (2007) Characterization of Escuminac peat and construction on peatland. In Proc. of the 2nd Int. Workshop on Characterisation and Engineering Properties of Natural Soils, Singapore.
    17. Littlejohn, GS (1991) inadequate site investigation. Ground Engineering, 24, 28–31.
    18. Longe, EO, Malomo, S, & Olorunniwo, MA, (1987) Hydrogeology of Lagos metropolis, Journal of African Earth Sciences, 6, 3, 163-174.
    19. Malkawi, AIH, Alawneh, AS & Abu-Safaqah, OT (1999) Effects of Organic Matter on the Physical and the Physicochemical Properties of an Illitic Soil. Applied Clay Science, 14, 257–278. http://dx.doi.org/10.1016/S0169-1317 (99)00003-4.
    20. Mitchum, RM, Vail, PR & Sangree, JB (1977) Stratigraphic interpretation of seismic reflection patterns in depositional sequences. In: Payton, C. E. (Ed), Seismic Stratigraphy-Applications to Hydrocarbon Exploration. AAPG Memoir 16, 117-123.
    21. Neal, (2004) Ground-penetrating radar and its use in sedimentology: principles, problems, and progress. Earth Science Review, 66, 261-330. http://dx.doi.org/10.1016/j.earscirev.2004.01.004.
    22. Olhoeft, GR (1979a): Electrical Properties, Initial Report of the Petrophysics Laboratory: USGS Circular 789, 1-26.
    23. Omatsola, ME, Adegoke, OS (1981) Tectonic evolution and Cretaceous stratigraphy of the Dahomey Basin. Journal of Mining and Geology, 18, 130–137.
    24. Soupios, PM, Georgakopoulos, P, Papadopoulos, N, Saltas, V, Andreadakis, A, Vallianatos, F, Sarris, A & Makris, JP (2007) Use of engineering geophysics to investigate a site for a building foundation. Journal of Geophysical Engineering, 4, 94–103. http://dx.doi.org/10.1088/1742-2132/4/1/011.
    25. Topp, GC, Davis, JL, & Annan, AP (1980) Electromagnetic determination of soil water content: measurements in coaxial transmission lines. Water Resource Res., 16, 574–582. http://dx.doi.org/10.1029/WR016i003p00574.

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  • How to Cite

    Adepelumi, A., Akindulureni, J., Agih, C., Olubodun, B., & Evinemi, I. (2014). Peat stratigraphy mapping using ground penetrating radar and geotechnical engineering implications. International Journal of Advanced Geosciences, 2(2), 86-96. https://doi.org/10.14419/ijag.v2i2.3267

    Received date: 2014-07-24

    Accepted date: 2014-08-30

    Published date: 2014-09-03