A case study on the determination of the excavated trench depth in unsaturated soil constructed by trench method without supporting structures

• Autorzy: Nguyen Xuan Man , Do Thi Them

Identyfikatory

DOI

10.29227/IM-2019-02-60

Warianty tytułu

Określania głębokości wykopu w gruncie suchym metodą wykopu bez konstrukcji wsporczych case study

• Konferencja: POL-VIET 2019 : scientific-research cooperation between Poland and Vietnam : 08–10.07.2019, Krakow
• Języki publikacji: EN

Abstrakty

EN

Together with the excavated width, the depth of trench play a vital role in stability as well as economics effectiveness of a trench constructed by open trench method. It is widely recognized that a steeper angle of an open trench, a smaller amount the excavated soil required; however, the trench is unstable. In this case, an external supporting structure system is obliged to prevent the trench from falling into the excavation zone. In addition, an open trench is normally located above the water table, hence under unsaturated condition. One of the most important characteristics of unsaturated soil is negative pore water pressure which brings about the matric suction, higher negative pore water pressure, higher matric suction; consequently, higher shear strength of soil. On the other hand, there is a few theories and research works have been reported on the method of determining a suitable depth of a trench under unsaturated condition. Previous works tend to assume that the distribution of matric suction is either constant or linear with depth; as a result of this, the designed results are often overestimated compared to practical results. In this paper, the effect of distribution of matric suction was taken into account to propose an equation to estimate the depth of a trench that can be applied without supporting structure. Finally, an example of numerical calculation of a depth of the open trench was described.

Słowa kluczowe

EN

excavation; depth; testing

PL

wykopy; głębokość; badania

• Wydawca: Polskie Towarzystwo Przeróbki Kopalin
• Czasopismo: Inżynieria Mineralna
• Rocznik: 2019
• Tom: R. 21, nr 2/2
• Strony: 80--88
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Nguyen Xuan Man

• HUMG Hanoi Univercity of Mining and Geology, Faculty of Building, Hanoi, Vietnam

autor

Do Thi Them

• House 14, Ngo Thi Sy Street, Langson City, Langson Provincy, Vietnam

Bibliografia

• 1. Bang S. Active earth pressure behind retaining walls. Journal of Geotechnical Engineering 111(3):407-412. (1985)
• 2. Bishop A, and Donald I. The experimental study of partly saturated soil in the triaxial apparatus. Proceedings of the 5th international conference on soil mechanics and foundation engineering, Paris. p 13-21. (1961)
• 3. Bishop AW, and Blight G. Some aspects of effective stress in saturated and partly saturated soils. Geotechnique 13(3):177-197. (1963)
• 4. Budhu M. Soil Mechanics and Foundations: Wiley. (2000)
• 5. Fredlund D, Morgenstern NR, and Widger R. 78. The shear strength of unsaturated soils. Canadian geotechnical journal 15(3):313-321.(2013)
• 6. Fredlund DG. The emergence of unsaturated soil mechanics. Canadian Geotechnical Journal 51(12):ix-x.(2014)
• 7. Fredlund DG, and Rahardjo H. Soil mechanics for unsaturated soils: John Wiley & Sons.(1993)
• 8. Fredlund DG, Rahardjo H, and Fredlund MD. Unsaturated soil mechanics in engineering practice: John Wiley & Sons.(2012)
• 9. Fredlund DG, Xing A, Fredlund MD, and Barbour S. The relationship of the unsaturated soil shear to the soil-water characteristic curve. Canadian Geotechnical Journal 33(3):440-448.(1996)

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).