Numerical Simulation on Flexural Mechanical Properties
of Steel TubeFrozen Soil Composite Structure

ZHOU Jianjun, CAI Guangyuan, SUN Feixiang, PENG Zhengyong, GUO Rui, ZENG Shuai, SHI Rongjian

doi:10.3973/j.issn.2096-4498.2022.S1.005

Tunnel Construction >

2022 , Vol. 42 >Issue S1: 40 - 47

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.S1.005

Numerical Simulation on Flexural Mechanical Properties of Steel TubeFrozen Soil Composite Structure

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(1. State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou 450001, Henan, China; 
2. China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China; 3. Xiamen Rail Transit  Group Co., Ltd., Xiamen 361001, Fujian, China; 4. School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China)

Online published: 2022-08-22

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Abstract

In order to analyze the characteristics of steel tubefrozen soil composite structure in bending process, based on the research results of laboratory test, the variation law of bearing capacity of steel tubefrozen soil composite structure is analyzed with ANSYS software. The conclusions obtained in the study are as follows:（1）The ultimate bearing capacity of steel tubefrozen soil composite structure can be increased by 52.6% when steel tube is arranged at the bottom of frozen soil structure；the stress distribution on composite structure section under load shows "stratification" phenomenon, and the stress calculation process satisfies the assumption of beam flat section. (2)When the shear stress between the steel tube and frozen soil exceeds its shear strength, the steel tube and frozen soil will slip, but the independent bearing capacity of the steel tube and frozen soil can still exert the bearing capacity of the composite structure. （3）The increase of the steel tube diameter and wall thickness can improve the ultimate bearing capacity of the composite structure；the ultimate bearing capacity of the steel tube arranged at the bottom of the structural section can obviously improve the bearing capacity of the composite structure, and its ultimate bearing capacity is about 30% higher than that of the steel tube located at the center or top of the section.

Key words： artificial freezing; steel tubefrozen soil composite structure; bending mechanical properties; numerical simulation; ultimate bearing capacity

Cite this article

ZHOU Jianjun, CAI Guangyuan, SUN Feixiang, PENG Zhengyong, GUO Rui, ZENG Shuai, SHI Rongjian . Numerical Simulation on Flexural Mechanical Properties of Steel TubeFrozen Soil Composite Structure[J]. Tunnel Construction, 2022 , 42(S1) : 40 -47 . DOI: 10.3973/j.issn.2096-4498.2022.S1.005

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