Lateral foundation reaction coefficient of feet-lock pipe in loess stratum

CHEN Li-jun; CHEN Jian-xun; LUO Yan-bin; WANG Chuan-wu; HU Tao-tao

doi:10.19818/j.cnki.1671-1637.2021.04.007

Volume 21 Issue 4

Sep. 2021

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Article Navigation > Journal of Traffic and Transportation Engineering > 2021 > 21(4): 106-115

CHEN Li-jun, CHEN Jian-xun, LUO Yan-bin, WANG Chuan-wu, HU Tao-tao. Lateral foundation reaction coefficient of feet-lock pipe in loess stratum[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 106-115. doi: 10.19818/j.cnki.1671-1637.2021.04.007

Citation:

CHEN Li-jun, CHEN Jian-xun, LUO Yan-bin, WANG Chuan-wu, HU Tao-tao. Lateral foundation reaction coefficient of feet-lock pipe in loess stratum[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 106-115. doi: 10.19818/j.cnki.1671-1637.2021.04.007

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Lateral foundation reaction coefficient of feet-lock pipe in loess stratum

doi: 10.19818/j.cnki.1671-1637.2021.04.007

School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Natural Science Foundation of China 41831286

National Natural Science Foundation of China 51808049

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Author Bio:
CHEN Li-jun(1986-), male, assistant professor, PhD, chenlijun2004@126.com
Corresponding author: CHEN Jian-xun(1969-), male, professor, PhD, chenjx1969@chd.edu.cn
Received Date: 2021-02-14
Available Online: 2021-09-16
Publish Date: 2021-08-01

Abstract

Abstract

A simulated loading test of a feet-lock pipe in the Malan loess stratum was conducted. The proportional coefficient of lateral foundation reaction coefficient of the feet-lock pipe was obtained through the inverse calculation. The variations in the proportional coefficient of lateral foundation reaction coefficient with the vertical load and displacement at the end of the feet-lock pipe were studied. The influence of installation angle of feet-lock pipe on the lateral foundation reaction coefficient was analyzed. The regression equation of the proportional coefficient of lateral foundation reaction coefficient with respect to the vertical displacement at the end of feet-lock pipe was fitted. The upper and lower limits of the proportional coefficient of lateral foundation reaction coefficient were determined. The proportional coefficients of lateral foundation reaction coefficient of feet-lock pipe with arbitrary angles in the range of 0°-30° were acquired through the interpolation calculation. Research results show that the proportional coefficient of lateral foundation reaction coefficient increases rapidly as the vertical load and displacement at the end of feet-lock pipe increase in the early stage of loading. This occurs because the loess around the feet-lock pipe is compacted continuously. When the loess around the feet-lock pipe enters the progressive failure stage, the proportional coefficient of lateral foundation reaction coefficient decreases continuously as the vertical load and displacement at the end of feet-lock pipe increase. The proportional coefficient of lateral foundation reaction coefficient of a feet-lock pipe installed at an angle of 30° exhibits significantly smaller variations with the vertical load and displacement compared with that of a feet-lock pipe installed at an angle of 0°. In the design and calculation of feet-lock pipe of tunnels in Malan loess stratum, when a feet-lock pipe with a diameter of 51 mm is installed at an angle between 0° and 30°, the proportional coefficient of lateral foundation reaction coefficient ranges from 66.9 to 296.1 MN·m^-4. The vertical load that a single feet-lock pipe with a diameter of 51 mm can bear is between 8.63 and 11.87 kN. 2 tabs, 13 figs, 31 refs.
- tunnel engineering,
- loess,
- feet-lock pipe,
- foundation reaction coefficient,
- proportional coefficient

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References

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Lateral foundation reaction coefficient of feet-lock pipe in loess stratum

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