Response characteristics of soil–underground structures under horizontal pushover

JING Li-ping; XU Kun-peng; CHENG Xin-jun; LIANG Hai-an; BIN Jia

doi:10.11779/CJGE202209001

Volume 44 Issue 9

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Chinese Journal of Geotechnical Engineering > 2022 > 44(9): 1567-1576. > DOI: 10.11779/CJGE202209001

JING Li-ping, XU Kun-peng, CHENG Xin-jun, LIANG Hai-an, BIN Jia. Response characteristics of soil–underground structures under horizontal pushover[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(9): 1567-1576. DOI: 10.11779/CJGE202209001

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Response characteristics of soil–underground structures under horizontal pushover

1.
Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
2.
Institute of Disaster Prevention, Langfang 065201, China
3.
School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China
4.
College of Civil Engineering, Hunan University of Technology, Zhuzhou 412000, China

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Received Date: September 06, 2021
Available Online: September 22, 2022

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Abstract

Abstract

The deformation of underground structures is restricted by that of the surrounding soil during earthquake. In order to reveal the complex interaction between the soil and the underground structures, based on the self-developed geotechnical comprehensive test model box, a large-scale pushover test on soil–underground structures is carried out with soil deformation as the control variable aiming at a single-story box type underground structure in sandy soil. The pushing plate in the model box is pushed horizontally according to the inverted triangle distribution displacement mode, namely the pushing plate is rotated around the bottom, and the rotation angle increases step by step from 0 to 1/60. The response characteristics of the underground structures and the surrounding soil under pushover action are mainly compared. The test results show that a horizontal penetration crack occurs at 6 cm above the middle of the inner wall in the pushing end when the rotation angle reaches 1/120, and a horizontal penetration crack occurs at 11 cm below the middle of the inner wall in the passive end when it reaches 1/150. The underground structures are subjected to the coupled action of extrusion deformation and shear deformation. The horizontal relative displacement between top and bottom of the side wall in the pushing end is significantly smaller than that of the soil at the corresponding position in auxiliary observation plane, and the deformation ratio of the structures to the soil increases from 0.44 to 0.75 after failure of the side wall. Meanwhile, the ratio of inverted triangle horizontal load between the soil and the structures decreases from 0.24 in the initial stage of the test to 0.10 and keeps stable, then increases to 0.32 after failure of the structures, and the degree of soil–structure interaction varies with the state change of the soil and structures. The horizontal coefficient of subgrade reaction in the soil decreases with the increase of loading level, and always changes within the given range of code. However, the horizontal coefficient of subgrade reaction on side wall fluctuates widely due to the failure of the structure and stress concentration at the corner.
- underground structure,
- seismic performance,
- pushover test,
- soil–structure interaction,
- coefficient of subgrade reaction

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References

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