DOI QR코드

DOI QR Code

평판재하시험을 이용한 공동 복구재료의 지지특성에 관한 현장실험

A Field Test on Bearing Capacity Characteristics of Materials for Ground Cavity Restoration Based on Plate Bearing Test

  • Park, Jeong-Jun (Incheon Disaster Prevention Research Center, Incheon National University) ;
  • Shin, Heesoo (Institute of Technology Research and Development, UCI Tech co. Ltd.) ;
  • Kim, Dongwook (Dept. of Civil and Environmental Engineering Incheon National University) ;
  • You, Seung-Kyong (Dept. of Civil Engineering, Myongji College) ;
  • Yun, Jung-Mann (Dept. of Construction Information System, ShinAnsan University) ;
  • Hong, Gigwon (Institute of Technology Research and Development, Korea Engineering & Construction)
  • 투고 : 2018.12.14
  • 심사 : 2018.12.21
  • 발행 : 2018.12.30

초록

본 연구에서는 하수관 손상 등과 같은 원인에 의해 발생한 공동을 개착식으로 복구하기 위하여 개발된 복구재료를 이용하여 평판재하시험 기반의 현장실험을 실시하였다. 또한 실험결과를 이용하여 복구재료에 대한 지지력을 비교하였으며, 하중지지특성을 분석하였다. 시험 결과, 팽창매트를 지표로부터 각각 0.1m, 0.2m 하부에 매설한 경우에 원지반의 최대 응력조건에서의 지지효과는 약 66%~70% 정도인 것으로 분석되었지만, 매설깊이에 따른 지지효과의 차이는 크지 않은 것으로 나타났다. 콘크리트매트가 적용된 경우의 지지효과는 원지반에 비하여 약 82%~90%로 나타났으며, 팽창매트로 보강된 경우에 비해서도 약 50% 정도의 지지효과를 보였다. 그리고 복구재료에 따른 허용지지력을 분석한 결과, 팽창매트와 콘크리트매트가 매설된 경우의 허용지지력은 원지반 대비 각각 약 130%~150%와 약 160% 이상을 확보하는 것으로 분석되었다.

This paper described a results of field test based on plate bearing test of the restoration material, which was developed to restore the ground cavity due to sewerage damage. The analysis of bearing capacity characteristics on the restoration materials was performed by experimental results. The results showed that the load bearing capacity in the maximum stress condition of the foundation ground is about 66%-70%, when the expansion mat is embedded at the bottom of 0.1 m and 0.2 m from the ground surface. However, The load bearing capacity of expansion mat according to embedded depth was not large. The load bearing capacity of concrete mats was about 82%-90% compared with that of ground surface, and it showed about 50% of the load bearing capacity compared with the expansion mat. As a result of analysis of allowable bearing capacity according to restoration materials, it was confirmed that the allowable bearing capacity of the expansion mat and the concrete was about 130%-150% and about 160% more than the foundation ground, respectively.

키워드

HKTHB3_2018_v17n4_293_f0001.png 이미지

Fig. 1. Field tests site

HKTHB3_2018_v17n4_293_f0002.png 이미지

Fig. 2. Test results for engineering properties of soil

HKTHB3_2018_v17n4_293_f0003.png 이미지

Fig. 3. Materials for ground cavity restoration

HKTHB3_2018_v17n4_293_f0004.png 이미지

Fig. 4. Field tests details

HKTHB3_2018_v17n4_293_f0005.png 이미지

Fig. 5. Plate bearing test cases & installation depth of restoration materials from ground surface

HKTHB3_2018_v17n4_293_f0006.png 이미지

Fig. 6. Procedure of field tests

HKTHB3_2018_v17n4_293_f0007.png 이미지

Fig. 7. Test results of foundation ground

HKTHB3_2018_v17n4_293_f0008.png 이미지

Fig. 8. Test results of ground applied in expansion mat - directly on the ground surface

HKTHB3_2018_v17n4_293_f0009.png 이미지

Fig. 9. Test results of ground applied in expansion mat - G.L. -0.1m

HKTHB3_2018_v17n4_293_f0010.png 이미지

Fig. 10. Test results of ground applied in expansion mat - G.L. -0.2m

HKTHB3_2018_v17n4_293_f0011.png 이미지

Fig. 11. Test results of ground applied in concrete mat - directly on the ground surface

HKTHB3_2018_v17n4_293_f0012.png 이미지

Fig. 12. Test results of ground applied in concrete mat - G.L. -0.1m

HKTHB3_2018_v17n4_293_f0013.png 이미지

Fig. 13. Test results of ground applied in concrete mat - G.L. -0.2m

HKTHB3_2018_v17n4_293_f0014.png 이미지

Fig. 14. Comparison of stress-settlement curve according to restoration materials

HKTHB3_2018_v17n4_293_f0015.png 이미지

Fig. 15. Comparison of allowable bearing capacity according to restoration materials

Table 1. Summary of soil properties

HKTHB3_2018_v17n4_293_t0001.png 이미지

Table 2. Allowable bearing capacity of ground according to restoration materials

HKTHB3_2018_v17n4_293_t0002.png 이미지

참고문헌

  1. Han, J. G., Ryu, Y. S., Kim, D., Park, J. J., Hong, G. (2017), "A Study on Expansion and Strength Characteristics of Material for Emergency Restoration in Ground Cavity", Journal of Korea Geosyntetics Society, Vol.16, No.2, pp.131-138.
  2. Han, J. G., Kim, Y. H., You, S. K. and Chung, D. S. (2018), "Filling System Analysis for Cavity in Ground using DEM", Journal of Korea Geosyntetics Society, Vol.17, No.1, pp. 119-126.
  3. Kim, J. B., You, S. K., Han, J. G., Hong, G. G. and Park, J. B. (2017a), "A Study on Simulation of Cavity and Relaxation Zone Using Laboratory Model Test and Discrete Element Method", Journal of Geosynthetics Society, Vol.16, No.2, pp.11-21.
  4. Kim, Y., Kim, H., Kim, Y., You, S. K. and Han, J. G. (2017b), "Experimental Study for Confirmation of Relaxation Zone in the Underground Cavity Expansion", Journal of Geosynthetics Society, Vol.16, No.4, pp.231-240.
  5. Korea institute of geoscience and mineral resources (2014), Research on causes and policy suggestions by sinkhole type, Research report, pp.18-39.
  6. KS F 2444 (2018), Standard test method for plate bearing test on shallow foundation.
  7. Lee, K., Kim, D. and Park, J. J. (2017), "Study on Management System of Ground Sinking Based on Underground Cavity Grade", Journal of Geosynthetics Society, Vol.16, No.2, pp.23-33.
  8. Lee, K., Choi, B. H., Park J. and Kim, D. (2018), "Numerical Analysis and Laboratory Experiment of Rapid Restoration of Underground Cavity Using Expansive Material without Excavation", Journal of Korean Geosynthetics Society, Vol.17, No.1, pp.55-64. https://doi.org/10.12814/JKGSS.2018.17.1.055
  9. Park, J. J., Kim, J. H., Kim, K. S., Kim, D. and Hong, G. (2018a), "Evaluation on Behavior Characteristics of a Pocketable Expansion Material for Ground Cavity Based on Wheel Tracking Test Results", Journal of the Society of Disaster Information, Vol.14, No.1, pp.79-88.
  10. Park, J. J., Kim, K., Kang, H., Kim, J. and Hong, G. (2018b), "Evaluation of Physical Properties and Long-term Stability of Expansion Materials for Emergency Repair by Temperature", Journal of Geosynthetics Society, Vol.17, No.1, pp.75-83.
  11. The Seoul Institue, (2016), The Road Subsidence Conditions and Safety Improvement Plans in Seoul, pp.6-19.
  12. You, S. K., Kim, J. B., Han, J. G., Hong, G. G., Youn, J. M. and Lee, k. I. (2017), "A Study on Simulation of Cavity and Relaxation Zone using Finite Element Method", Journal of Geosynthetics Society, Vol.16, No.4, pp.67-74.
  13. Yu, N. J., Choi, J. H. and Lee, K. I. (2017), "Fundamental Study on the Development of Filling Materials for Trenchless Emergency Restoration of Ground Cavity", Journal of Korean Geosynthetics Society, Vol.16, No.2, pp.97-107. https://doi.org/10.12814/jkgss.2017.16.2.097