바로가기메뉴

본문 바로가기 주메뉴 바로가기

(사)한국터널지하공간학회

ISSN : 2233-8292

Article Contents

Prev Next
e-Submission

Vol.20 No.6

Citation Share

A simple test method to evaluate workability of conditioned soil used for EPB Shield TBM

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2018, v.20 no.6, pp.1049-1060
https://doi.org/10.9711/KTAJ.2018.20.6.1049




& (2018). A simple test method to evaluate workability of conditioned soil used for EPB Shield TBM. (사)한국터널지하공간학회, 20(6), 1049-1060, https://doi.org/10.9711/KTAJ.2018.20.6.1049

Abstract

Soil conditioning is one of the key factors for successfull tunnel excavations utilizing the earth pressure-balanced (EPB) shield tunnel boring machine (TBM) by increasing the tunnel face stability and extraction efficiency of excavated soils. In this study, conditioning agents are mixed with the weathered granite soils which are abundant in the Korean peninsula and the workability of the resulting mixture is evaluated through the slump tests to derive and propose the most suitable conditioning agent as well as the most appropriate agent mix ratios. However, since it is cumbersome to perform the slump tests all the time either in the laboratory or in-situ, a simpler test may be needed instead of the slump test; the fall cone test was proposed as a substitute. In this paper, the correlation between the slump value obtained from the slump test and the cone penetration depth obtained from the proposed fall cone test was obtained. Test results showed that a very good correlation between two was observed; it means that the simpler fall cone test can be used to assess the suitability of the conditioned soils instead of the more cumbersome slump test.

keywords
Soil conditioning, Weathered granite soil, Workability, Slump test, Fall cone test, 쏘일 컨디셔닝, 화강풍화토, 워커빌리티, 슬럼프 시험, 낙하 콘 시험

Reference

1.

1. ASTM (2012). Standard test method for laboratory compaction characteristics of soil using standard effort (12,000 ft-lbf/ft3 (600 kN-m/m3)), D698-12e2, West Conshohocken, PA, ASTM International.

2.

2. ASTM (2015). Standard test method for slump of hydraulic-cement concrete, C143/C143M-15a, West Conshohocken, PA, ASTM International.

3.

3. British Standard Institution (1990). BS 1377-2: Soils for civil engineering purposes - part 2: classification, London.

4.

4. Budach, C. (2012). Untersuchungen zum erweiterten Einsatz von Erddruckschilden in grobkörnigem Lockergestein, Ph.D. Thesis, Bochum University, North Rhine-Westphalia, Germany, pp. 101-105.

5.

5. Budach, C., Thewes, M. (2015). “Application ranges of EPB shields in coarse ground based on laboratory research”, Tunnelling and Underground Space Technology, Vol. 50, pp. 296-304.

6.

6. Kim, T.H., Kim, B.K., Lee, K.H., Lee, I.M. (2018). “Soil conditioning of weathered granite soil used for EPB shield TBM: a laboratory scale study”, KSCE Journal of Civil Engineering, Under Review.

7.

7. Martinelli, D., Peila, D., Campa, E. (2015). “Feasibility study of tar sands conditioning for earth pressure balance tunnelling”, Journal of Rock Mechanics and Geotechnical Engineering, Vol. 7, No. 6, pp. 684-690.

8.

8. Peila, D., Oggeri, C., Borio, L. (2009). “Using the slump test to assess the behavior of conditioned soil for EPB tunneling”, Environmental and Engineering Geoscience, Vol. 15, No. 3, pp. 167-174.

9.

9. Peila, D., Picchio, A., Chieregato, A. (2013). “Earth pressure balance tunnelling in rock masses:Laboratory feasibility study of the conditioning process”, Tunnelling and Underground Space Technology, Vol. 35, pp. 55-66.

10.

10. Pena Duarte, M.A. (2007). Foam as a soil conditioner in tunnelling: physical and mechanical properties of conditioned sands. Ph.D. Thesis, Oxford University, Oxfordshire County Oxford, England, United Kingdom, pp. 68-71.

11.

11. Quebaud, S., Sibaï, M., Henry, J.P. (1998). “Use of chemical foam for improvements in drilling by earthpressure balanced shields in granular soils”, Tunnelling and Underground Space Technology, Vol. 13, No. 2, pp. 173-180.

(사)한국터널지하공간학회

e-Submission OA Policy