Compression Size Effect and Strain Rate Effect of a New Polyurethane Elastomer Grouting Material
PAN Wang1,2,3, XIA Yangyang1,2,3, ZHANG Chao1,2,3,*, FANG Hongyuan1,2,3, WANG Fuming1,2,3
1 School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China 2 National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology, Zhengzhou 450001, China 3 Collaborative Innovation Center for Disaster Prevention and Control of Underground Engineering Jointly Built by Provinces and Ministries, Zhengzhou 450001, China
Abstract: In order to solve the problems of low strength, weak anti-deformation ability and poor injectivity of existing grouting reinforcement materials for wind power foundation, a new polyurethane elastomer grouting material was prepared. Considering the size effect and strain rate effect, the uniaxial compression test was carried out, the compressive stress-strain relationship curve was obtained, and a four-parameter phenomenological constitutive model suitable for the polyurethane elastomer grouting material was proposed. The results show that the stress-strain relationship can be divided into three stages:elastic stage, yield stage and strain-softening stage before the material reaches the ultimate failure stage. The elastic modulus, compressive strength, softening stress, energy density and other mechanical parameters of the material increase with the increase of strain rate, and decrease first and then increase with the increase of specimen size, and the strain rate effect is more significant than the size effect. In addition, the four-parameter phenomenological constitutive model proposed in this work can accurately characterize the stress-strain relationship of the material. The constitutive model provides an important scientific basis for theoretical calculation and engineering application of the polyurethane elastomer grouting material.
通讯作者:
* 张超,郑州大学水利科学与工程学院副教授、硕士研究生导师。2008年西北农林科技大学土木工程专业本科毕业,2011年西北农林科技大学结构工程专业硕士毕业,2018年德国魏玛包豪斯大学结构工程博士毕业,2019年到郑州大学工作至今。目前主要从事工程修复材料的多尺度物理力学性能与提升、先进结构材料的设计与应用等方面的研究工作。发表论文40余篇,包括Composite part B:Engineering、Engineering Geology、Nanoscale、Construction and Building Materials、《岩土力学》等,申请和授权专利20余项。chao.zhang.zzu@outlook.com
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2023, Vol. 37 
