Experimental Study on Fatigue Performance and Cumulative Damage of Bottom Structure of Heavy Haul Railway Tunnel

被引：1
作者：
Liu C. [1 ]
Peng L. [1 ]
Lei M. [1 ]
Liu N. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha, 410075, Hunan
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2019年 / 40卷 / 04期
关键词：
Bottom structure of tunnel; Fatigue cumulative damage; Fatigue life; Heavy haul railway tunnel; Surrounding rock pressure; Train load;
D O I：
10.3969/j.issn.1001-4632.2019.04.10
中图分类号：
学科分类号：
摘要：
According to the mechanical characteristics of fatigue vulnerable positions at the bottom of heavy haul railway tunnel, a series of fatigue tests were conducted in the condition of high static load and low dynamic load with bilateral confinements to obtain the evolution laws for the maximum tensile strain and conductance of the bottom structure of heavy haul railway tunnel. Then the fatigue performance and cumulative damage of the structure were studied through analyzing test data. Results show that when the maximum stress level is not higher than 0.60, the maximum tensile strain of the specimen develops in 2 stages with no occurrence of fatigue failure, and the maximum tensile strain amplitude and growth rate always keep constant. When the maximum stress level exceeds 0.70, the maximum tensile strain of the specimen develops in 3 stages of "inverted S" type, resulting in fatigue failure. The maximum tensile strain and its increment, amplitude, growth rate increase quickly in stage-Ⅰ and stage-Ⅲ, and slow linear in stage-Ⅱ. The fatigue life of specimens decreases with the increase of static load and dynamic load. The formula of two-parameter fatigue life (S-N) is obtained by fitting the test data with multivariate linear function. At the same time, based on the time-varying characteristics of the maximum tensile strain and the conductance of the specimen, the nonlinear cumulative damage evolution curve and calculation formula of the tunnel bottom structure is obtained. © 2019, Editorial Department of China Railway Science. All right reserved.
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页码：77 / 85
页数：8
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