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Study on the Behavior of Sabkha Deposit during Dynamic Compaction

사브카 지반 동다짐 공법 적용 시 지반거동 분석

Joon-Shik Moon1*
문 준식1*
1Member, Assistant Professor, Dept. of Civil Engineering Kyungpook Univ
*교신저자. *Corresponding Author. 
30 December 2017. pp. 103-111
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Abstract

Saudi Arabia coastal area is highly valuable construction as a flat area covered by sabkha deposit. However, sabkha deposit has some geotechnical problems because of high groundwater level, high salt contents in groundwater, loose density, and possibility of collapsible settlement due to presence of crystals vulnerable to moisture, and ground improvement is needed to improve the bearing capacity. In this study, the characteristics of the sabkha soils in the coastal area of Saudi Arabia were analyzed and the applicability of dynamic compaction method was evaluated. Parametric study was conducted to analyze the behavior of sabkha deposit during dynamic compaction. The appropriateness of the proposed analytical solutions to estimate the depth of improvement was evaluated, and the troubles and notes in applying dynamic compaction in sabkha deposit were discussed.

Keywords
Sabkha deposit
Dynamic compaction
Poorly graded sand
Low permeability
Collapsible ground

사우디 아라비아 해안지역은 사브카 토사로 덮인 매우 넓은 평지구역으로 활용가치가 높지만 소금물로 된 높은 지하수위와 느슨한 밀도, 수분에 취약한 결정체 등의 함유로 갑작스런 침하 등의 문제를 가지고 있어 지지력 향상을 위한 지반개량이 필요하다. 본 연구에서는 사우디 해안지역의 사브카 지반의 특성을 분석하고 동다짐 공법의 적용성을 평가하였다. 수치해석 매개변수분석을 수행하여 동다짐 조건에 따른 사브카 지반의 거동을 분석하고 기존에 제안된 영향깊이 산정법 등이 사브카 지반에 적용이 적절한 지 평가하였으며, 동다짐 공법 적용 시 문제점과 대책에 대하여 논하고자 한다.

References
1
Lukas, R. G. (1986). Dynamic compaction of highway con-struction, design and construction guidlines. Report No. FHWA/RD-86/133, Fedral Highway Administration, Washington D.C
2
Mayne, P. W., Jones, J. S., and Dumas, J. C. (1984) “Ground response to dynamic compaction”. J Geotech Eng, ASCE; 110(JT6), pp.757-73.
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Menard, L. and Broise, Y. (1975) “Theoretical and practical aspects of dynamic consolidation”. Geotechnique, 25(1), pp.3-18.
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Moon, J. S. (2013) “Geotechnical Considerations for Railway Design in the Middle East”, J. of the Korean Geotechnical Society, 29(11), pp.49-60.
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Omar Saeed Baghabra Al-Amoudi (2008) “Testing and stabilization of saline sabkha soils: A review”, Sixth International Conference on Case Histories in Geotechnical Engineering, paper 45.
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Oshima, A. and Takada, N. (1994). “Effect of ram momentum on compaction by heavy tamping”, International Conference on Soil Mechanics & Foundation Engineering, 13(3), pp 1141-1144.
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Qian, J. H. (1987) Dynamic consolidation, from practice to theory, Proceedings, 8th Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, Vol.1, pp. 201-204.
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Solocombe, B.C. (1993) Dynamic compaction, Chap. 2, Moseley, M.P., Editor, CRC Press, Florida.
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 16
  • No :4
  • Pages :103-111
  • Received Date : 2017-11-30
  • Revised Date : 2017-12-12
  • Accepted Date : 2017-12-12
  • DOI :https://doi.org/10.12814/jkgss.2017.16.4.103
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