Strengthening soft soil for approach road after abutment by cement and fly ash
Email:
ndinhhung@hcmiu.edu.vn
Từ khóa:
Soft soil, cement, fly ash, unconfined compressive strength, shear strength, direct shear test.
Tóm tắt
Approach road is an important structure of a bridge. Serviceability of a bridge is affected by the settlement of approach road, especially that on soft soil. One method that is usually applied for minimizing effect of settlement of approach road is to replace soft soil by hill soil. This method however may increase cost of projects in Mekong Delta area with a larger depth of soft soil. In this paper, soft soil strengthened by mixing it to cement and fly ash at different mix proportions was investigated. Test results from unconfined compression test and direct shear test of strengthened soft soil are compared to those of hill soil to determine the optimal mix proportion. Results showed that mixing 25kg cement and 75kg or 100kg fly ash to 1m3 soft soil increased its unconfined compressive strength and shear strength and are higher compared to those of hill soil. Strengthening in situ soft soil by using fly ash, industrial waste from thermal power plant, reduces cost of project and at the same time contributes to solving environmental problems.Tài liệu tham khảo
[1]. Decision No. 3095/QD-BGTV dated October 7th, 2013 regarding issuance of the provisional regulation on technical technology solution transition embankment sections between the road and the bridge (culvert) on the highway, 2013 (in Vietnamese).
[2]. Nguyen Trung Hong, Tran Tien Dung, Causes settlement of approach road after abutment – Specifications for designing approach road, Symposium of Information for design, The Transport Engineering Design Incorporated, pp.33-43, 2nd Quarter, 2013 (in Vietnamese).
[3]. Truong Minh Hoang, Nguyen Van Lap, Ta Thi Kim Oanh, Takemura Jiro, Changes in late Pleistocene–Holocene sedimentary facies of the Mekong River Delta and the influence of sedimentary environment on geotechnical engineering properties, Journal of Engineering Geology, 122 (2011) 146-159. https://doi.org/10.1016/j.enggeo.2011.05.012
[4]. M. Bilal, A. Talib, A study on advances in ground improvement techniques, National Conference on Advances in Geotechnical Engineering, (2016). https://www.researchgate.net/publication/304290990_A_STUDY_ON_ADVANCES_IN_GROUND_IMPROVEMENT_TECHNIQUES
[5]. H. Elbadry, A.Eid, Simplified technique achieving low cost and high-performance impact for construction in very deep very soft ground sites, Housing and Building National Research Center Journal, 14 (2016) 56-65. https://doi.org/10.1016/j.hbrcj.2016.01.002
[6]. Moradi, R., Marto, A., Rashid, A.S.A. et al., Enhancement of Soft Soil Behaviour by using Floating Bottom Ash Columns. KSCE Journal of Civil Engineering 23 (2019) 2453–2462. https://doi.org/10.1007/s12205-019-0617-x
[7]. M. A. Ozdemir, Improvement in bearing capacity of a soft soil by addition of fly ash, Procedia Engineering Journal, 143 (2016) 498-505.
[8]. Braja M. Das, Principle of geotechnical engineering, 7th Edition, Cengage Learning, 2010.
[9]. J. C. Chai, N. Miura, H. Koga, Lateral displacement of ground caused by soil-cement column installation, Journal of Geotechnical and Geoenvironmental Engineering, 131 (2005) 623-632. https://doi.org/10.1061/(ASCE)1090-0241(2005)131:5(623)
[10]. A. Farouk, M. Shahien, Ground improvement using soil–cement columns: Experimental investigation, Alexandria Engineering Journal, 52 (2013) 4733-740. https://doi.org/10.1016/j.aej.2013.08.009
[2]. Nguyen Trung Hong, Tran Tien Dung, Causes settlement of approach road after abutment – Specifications for designing approach road, Symposium of Information for design, The Transport Engineering Design Incorporated, pp.33-43, 2nd Quarter, 2013 (in Vietnamese).
[3]. Truong Minh Hoang, Nguyen Van Lap, Ta Thi Kim Oanh, Takemura Jiro, Changes in late Pleistocene–Holocene sedimentary facies of the Mekong River Delta and the influence of sedimentary environment on geotechnical engineering properties, Journal of Engineering Geology, 122 (2011) 146-159. https://doi.org/10.1016/j.enggeo.2011.05.012
[4]. M. Bilal, A. Talib, A study on advances in ground improvement techniques, National Conference on Advances in Geotechnical Engineering, (2016). https://www.researchgate.net/publication/304290990_A_STUDY_ON_ADVANCES_IN_GROUND_IMPROVEMENT_TECHNIQUES
[5]. H. Elbadry, A.Eid, Simplified technique achieving low cost and high-performance impact for construction in very deep very soft ground sites, Housing and Building National Research Center Journal, 14 (2016) 56-65. https://doi.org/10.1016/j.hbrcj.2016.01.002
[6]. Moradi, R., Marto, A., Rashid, A.S.A. et al., Enhancement of Soft Soil Behaviour by using Floating Bottom Ash Columns. KSCE Journal of Civil Engineering 23 (2019) 2453–2462. https://doi.org/10.1007/s12205-019-0617-x
[7]. M. A. Ozdemir, Improvement in bearing capacity of a soft soil by addition of fly ash, Procedia Engineering Journal, 143 (2016) 498-505.
[8]. Braja M. Das, Principle of geotechnical engineering, 7th Edition, Cengage Learning, 2010.
[9]. J. C. Chai, N. Miura, H. Koga, Lateral displacement of ground caused by soil-cement column installation, Journal of Geotechnical and Geoenvironmental Engineering, 131 (2005) 623-632. https://doi.org/10.1061/(ASCE)1090-0241(2005)131:5(623)
[10]. A. Farouk, M. Shahien, Ground improvement using soil–cement columns: Experimental investigation, Alexandria Engineering Journal, 52 (2013) 4733-740. https://doi.org/10.1016/j.aej.2013.08.009
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Nhận bài
29/04/2020
Nhận bài sửa
21/05/2020
Chấp nhận đăng
21/05/2020
Xuất bản
28/05/2020
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Kiểu trích dẫn
Nguyen Dinh, H. (1590598800). Strengthening soft soil for approach road after abutment by cement and fly ash. Tạp Chí Khoa Học Giao Thông Vận Tải, 71(4), 444-457. https://doi.org/10.25073/tcsj.71.4.12
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