力学与实践 ›› 2013, Vol. 35 ›› Issue (3): 57-61.DOI: 10.6052/1000-0879-12-379

• 应用研究 • 上一篇    下一篇

冻融环境下红砂岩力学特性试验及损伤分析

张慧梅1, 杨更社2   

  1. 1. 西安科技大学力学系, 西安 710054;
    2. 西安科技大学建筑与土木工程学院, 西安 710054
  • 收稿日期:2012-10-10 修回日期:2013-01-14 出版日期:2013-06-08 发布日期:2013-09-06
  • 作者简介:张慧梅,1968年生,女,博士,教授,主要从事力学与岩土工程方面的教学与研究工作.E-mail:zhanghuimei68@163.com;杨更社,1962年生,男,博士,教授,博士生导师,主要从事岩土力学与工程方面的研究.E-mai:lyanggs@xust.edu.cn
  • 基金资助:

    国家自然科学基金(11172232,41272340);陕西省自然科学基金(2011JM1003)和陕西省教育厅专项基金(11JK0525)资助项目.

MECHANICAL PROPERTY EXPERIMENT AND DAMAGE ANALYSIS OF RED SANDSTONE UNDER FREEZE-THAW ENVIRONMENT

ZHANG Huimei1, YANG Gengshe2   

  1. 1. Department of Mechanics, Xi'an University of Science and Technology, Xi'an 710054, China;
    2. College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
  • Received:2012-10-10 Revised:2013-01-14 Online:2013-06-08 Published:2013-09-06

摘要:

将实验研究与损伤力学理论分析相结合,对红砂岩进行饱水状态下的冻融循环试验及不同冻融次数下的力学特性试验,分析了岩石的冻融损伤劣化过程,系统研究了岩石的变形破坏规律及损伤扩展力学特性.研究表明:红砂岩呈现出剥落和断裂的冻融损伤劣化模式;随着冻融次数的增加,岩石的强度及弹性模量急剧降低,并表现出压密性增大、弹性减弱、塑性增强的特征;岩石初始细观结构的缺陷经过损伤的非线性演化,表现出宏观力学性能的劣化.

关键词:

岩石|冻融循环|力学特性|损伤

Abstract:

Combining the experiments and the damage mechanical theory analysis, the freeze-thaw cycling experiment was conducted for the red sandstone in the water-saturated state, the mechanical property tests with different number of freeze-thaw cycles were carried out, the rock deterioration process of the freeze-thaw damage was analyzed, then the deformation and failure laws and the damage propagation mechanical characteristics were studied systematically for rock. It is shown that the deterioration modes of the freeze-thaw damage for the red sandstone include the spalling mode and the fracture mode. The greater the number of the freeze-thaw cycles the more intensified the reduction of the strength and the elastic modulus will result, with the increased compaction property, the weakened elasticity and the enhanced plasticity. Through the nonlinear evolution of the rock damage, the initial defect of meso-structure within the rock will lead to the deterioration of the macro mechanical behavior finally.

Key words:

rock|freeze-thaw cycle|mechanical characteristics|damage

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