|Table of Contents|

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

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2021年04期
Page:
106-115
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Lateral foundation reaction coefficient of feet-lock pipe in loess stratum
Author(s):
CHEN Li-jun CHEN Jian-xun LUO Yan-bin WANG Chuan-wu HU Tao-tao
(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
tunnel engineering loess feet-lock pipe foundation reaction coefficient proportional coefficient
PACS:
U452
DOI:
10.19818/j.cnki.1671-1637.2021.04.007
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.

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Last Update: 2021-09-01