A numerically investigate of the improvement of load carrying capacity of square footings utilizing micropiles

  • Affiliations:

    1 Hanoi University of Mining and Geology, Hanoi, Vietnam
    2 FUCONS Join Stock Company, Hanoi, Vietnam

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  • Received: 18th-May-2022
  • Revised: 29th-Aug-2022
  • Accepted: 1st-Oct-2022
  • Online: 31st-Oct-2022
Pages: 106 - 117
Views: 3330
Downloads: 2157
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This paper is aimed to address an actual case study on the use of micropile technology for improving the bearing capacity of an old building. The numerical simulation results show that the load-carrying capacity of square footing utilizing micropiles is notably increased. The improvement of the bearing capacity of the foundations depends on the strengthening methods, such as inclination angle ((), length (L), and distance of micropile from the edge of footings (S). Specifically, with the same length value of pile used, the bearing capacity reaches the largest magnitude at the S/B ratios of (0.5(0.75). The use of inclined piles yields a larger magnitude of bearing capacity than the vertical ones, these obtained results are contributed to the contribution of the “confining effects” of soil mass underneaths the footing as subjected to vertical loads. Additionally, if the soil mass below the footing has a high bearing capacity (firm to stiff clayey soils, medium to dense sandy soils…) , the design value of L/B ratio in the strengthening method should be in range of (2.0÷3.0), chosing beyond that optimal range is uneconomical since the improvement of bearing capacity is insignificant. In other words, the relationship between stress bulb in soil under the footing and the length of micropile should be taken into consideration to achieve a higher economic efficiency of the strengthening method.

How to Cite
Bui, D.Van, Nguyen, M.Van, Nguyen, T.Dang and Vu, T.Nho 2022. A numerically investigate of the improvement of load carrying capacity of square footings utilizing micropiles (in Vietnamese). Journal of Mining and Earth Sciences. 63, 5 (Oct, 2022), 106-117. DOI:https://doi.org/10.46326/JMES.2022.63(5).10.

Abu-Farsakh, M.Y., Chen, Q., and Yoon, S. (2008). Use of reinforced soil foundation (RSF) to support shallow foundation (No. FHWA/LA. 07/423). Louisiana Transportation Research Center.

Al-Aghbari, M.Y., and Mohamedzein, Y.A. (2004). Model testing of strip footings with structural skirts. Proceedings of the Institution of Civil Engineers-Ground Improvement8(4), 171-177.

Brinkgreve, R., Broere, W., and Waterman, D. (2002). Plaxis 2D-version 8. Swets and Zeitlinger publishers.

Bruce, D.A., Dimillio, A.F., and Juran, I. (1997). Micropiles: the state of practice part 1: characteristics, definitions and classifications. Proceedings of the Institution of Civil Engineers-Ground Improvement1(1), 25-35.

Das, B., and Sivakugan, N. (2007). Settlements of shallow foundations on granular soil—an overview. International journal of geotechnical engineering1(1), 19-29.

Eid, H.T. (2013). Bearing capacity and settlement of skirted shallow foundations on sand. International Journal of Geomechanics13(5), 645-652.

FHWA, N., (2005). Micropile design and construction—Reference manual. FHWA NHI-05-039, US Dept. of Transportation, McLean, VA, 436.

Hwang, J.G., Yoon, Y.W., Song, K.I., (2021). Improvement of Bearing Capacity of Shallow Foundation with the Wall Attached to the Base-Slab: Model Test. KSCE J. Civ. Eng. 25, 1276–1282.

Jaiswal, S., Srivastava, A., Bhushan Chauhan, V., (2021). Improvement of bearing capacity of shallow foundation resting on wraparound geotextile reinforced soil, in: IFCEE 2021. pp. 65–74.

Juran, I., Bruce, D.A., Dimillio, A., Benslimane, A., (1999). Micropiles: the state of practice. Part II: design of single micropiles and groups and networks of micropiles. Proc. Inst. Civ. Eng.-Ground Improv. 3, 89–110.

Kazi, M., Shukla, S.K., Habibi, D., (2015). An improved method to increase the load-bearing capacity of strip footing resting on geotextile-reinforced sand bed. Indian Geotech. J. 45, 98–109.

Kolay, P.K., Kumar, S., Tiwari, D., (2013). Improvement of bearing capacity of shallow foundation on geogrid reinforced silty clay and sand. J. Constr. Eng. 2013, 1–10.

Mahmoudabadi, V., and Ravichandran, N. (2019). Design of shallow foundation considering site-specific rainfall and water table data: Theoretical framework and application. International Journal of Geomechanics, 19(7), 04019063.

Pusadkar, S.S., Bhatkar, T., (2013). Behaviour of raft foundation with vertical skirt using plaxis 2D. Int. J. Eng. Res. Dev. 7, 20–24.

Polishchuk, A., Nikitina, N., Petukhov, A., Semyonov, I., (2021). Strengthening of the Foundations of Renovated Buildings With Injection Piles. Int. J. Comput. Civ. Struct. Eng. 17, 75–86.

Sajjad, G., and Masoud, M., (2018). Study of the behaviour of skirted shallow foundations resting on sand. Int. J. Phys. Model. Geotech. 18, 117–130.

Schweiger, H., A. Gens, Sl Wei, J. Cheuk and W. Cheang. "Plaxis Advanced course on computational geotechnics." Hong Kong (2012).

Terzaghi, (1943). The Evolution of Pore Water Pressure in a Saturated Soil Layer between Two Draining Zones by Analytical and Numerical Methods. Theoretical Soil Mechanics. Wiley, New York.

Terzaghi, K., Peck, R.B., Mesri, G., (1996). Soil mechanics in engineering practice. John Wiley and Sons.

TCVN 1651-2:2008., (2008). Steel for the reinforcement of concrete – Part 2: Ribbed bars.

Van Baars, S., (2018). 100 years of Prandtl’s wedge. IOS Press.

Dang, V.K., Do, N.A., Nguyen, T.T., Huynh, D.A., Nguyen, V.V.P., (2021). An overview of research on metro tunnel lining in the sub-rectangular shape. Journal of Mining and Earth Sciences Vol62(4), 68-78. (in Vietnamese).