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Numerical Analysis and Laboratory Experiment of Rapid Restoration of Underground Cavity Using Expansive Material without Excavation

팽창재료를 이용한 지하공동의 비개착식 긴급복구 공법에 대한 실내실험 및 수치해석

Kicheol Lee1
,
Byeong-Hyun Choi2
,
Jongho Park3
,
Dongwook Kim4*
이 기철1
,
최 병현2
,
박 종호3
,
김 동욱4*
1Graduate Student, Dept of Civil and Environmental Engineering, Incheon National University
2Undergraduate Student, Dept of Civil and Environmental Engineering, Incheon National University
3Undergraduate Student, Dept of Civil and Environmental Engineering, Incheon National University
4 Associate Professor, Department of Civil and Environmental Engineering, Incheon National University
*교신저자. *Corresponding Author. 
30 March 2018. pp. 55-64
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Abstract

The purpose of this study is to evaluate the suitability of emergency underground cavity restoration method filling cavity with expansive material based on numerical analysis. For the numerical analysis, experiments were conducted to evaluate properties of expansive material. Based on the measured expansion pressure of the expansive material from the experiment, behavior of underground cavity restoration with various cavity dimensions (variation of height and width of rectangular-shape cavity) was numerically assessed. As a result of analysis, the vertical displacements of the top and bottom of cavity were significantly influenced by the cavity width and lateral displacements of cavity sides were highly dependent on cavity height. These vertical and lateral displacements were increased with increasing expansion pressure of expansive material. Also, when the expansion pressure was applied, the vertical displacement of the upper surface layer of the road was less dependent on cavity height, and was greatly influenced by cavity width.

Keywords
Restoration method
Cavity
Expansion material
Expansion pressure
Numerical analysis

본 연구에서는 최근 도심지에서 발생하고 있는 지반함몰에 대하여 팽창재료를 이용한 긴급복구공법을 적용하고 이러한 공법의 적합성을 수치해석적으로 판단하고자 한다. 수치해석에 적용된 팽창재료의 특성을 평가하기 위하여 실내실험을 수행하였다. 실험으로 구한 팽창특성을 반영하여 다양한 공동 형상(직사각형 단면을 가지는 공동에 대하여 다양한 높이와 폭 조합)에 대하여 팽창재료를 적용하였을 경우 팽창재료 및 지반 거동을 평가하였다. 해석 결과, 공동의 상단과 하단의 연직변위는 공동의 높이보다는 공동의 폭에 큰 영향을 받으며, 공동 측면부의 수평변위는 공동 폭 보다는 공동의 높이의 영향을 많이 받는 것으로 나타났다. 또한, 팽창압이 작용하였을 경우 도로상부 표층의 수직변위량은 공동의 높이보다는 공동의 폭에 큰 영향을 받는 것을 확인할 수 있었다.

References
1
Han, J. G., Ryu, Y. S., Kim, D., Park, J. J. and Hong, G. (2016), “A Study on Expansion and Strength Characteristics of Material for Emergency Restoration in Ground Cavity”, Journal of Korean Geosynthetics Society, Vol.16, No.2, pp.131-138. (in Korean)
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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 : 17
  • No :1
  • Pages :55-64
  • Received Date : 2018-02-05
  • Revised Date : 2018-03-03
  • Accepted Date : 2018-03-04
  • DOI :https://doi.org/10.12814/jkgss.2018.17.1.055
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