Compression Fatigue Damage Evolution and Life Prediction of Polymer Grouting Materials

被引：0

作者：

Zhang C. ^{[1
,2
,3
]}

Pan W. ^{[1
,2
,3
]}

Fang H.-Y. ^{[1
,2
,3
]}

Wang C.-X. ^{[1
,2
,3
]}

Wang F.-M. ^{[1
,2
,3
]}

机构：

[1] School of Water Conservancy and Transportation, Yellow River Laboratory, Underground Engineering Research Institute, Zhengzhou University, Henan, Zhengzhou

[2] Collaborative Innovation Center for Disaster Prevention and Control of Underground Engineering Jointly Built by Provinces and Ministries, Henan, Zhengzhou

[3] National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology, Henan, Zhengzhou

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2023年 / 36卷 / 10期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

compression fatigue; fatigue damage; grout rehabilitation Received 26 Dec. 2022; life prediction; polymer grouting material; subgrade engineering;

D O I：

10.19721/j.cnki.1001-7372.2023.10.006

中图分类号：

学科分类号：

摘要：

Polymer grouting materials are widely used in non-excavation highway rehabilitation owing to their short curing times, large expansion forces and expansion ratios, light weight, high strength, etc. The mechanical properties of polymer grouting materials are affected by long-term traffic loading to a certain extent. However, no systematic study has been conducted to identify the fatigue damage evolution law(s) or to predict service lives. In this study, the rehabilitation effects and static-dynamic compressive performances of polymer grouting materials were analyzed using field tests, quasi-static compression tests, and cyclic compression tests. In addition, a fatigue threshold prediction formula was proposed based on the density and service life. The results show that the elastic modulus, compressive strength, and quasi-static energy dissipation increase with increasing density and that power function relationships exist between them. The fatigue thresholds of polymer grouting materials with different densities are in the range of 0. 6-0. 8. The evolution of the compressive fatigue properties with the relative number of cycles can be divided into three stages: the adjustment stage, stable change stage, and cyclic failure or cyclic-hardening stage. At higher stress levels (0. 7 and 0. 8), the dynamic elastic modulus decreases and the accumulated strain, strain rate, and dynamic energy dissipation increase after the adjustment and stable-change stages. The fatigue performance parameters change dramatically after the relative number of cycles reaches 80%, with the dynamic elastic modulus decreasing by an average of 93. 69 MPa and the accumulated strain, strain rate, and dynamic energy dissipation increasing by averages of 0. 15, 0. 20 s_1, and 0. 027 MJ: m~3, respectively. The specimens are destroyed and cracks and collapses occur in the cell structures. At low stress levels (0. 6), the dynamic elastic modulus and accumulated strain are related to the number of cycles as a logarithmic function; after the adjustment stage, the strain rate and dynamic energy dissipation are related to the number of cycles as an exponential function. After cyclic hardening, no significant damage occurs to the macro-microscopic morphology and the compressive strength and elastic modulus increase by over 20% on average. The results from this study provide theoretical guidance and a scientific basis for the evaluating the durability and promoting the application of polymer grouting materials. © 2023 Xi'an Highway University. All rights reserved.

引用

页码：64 / 74

页数：10

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