赵宝云*,刘东燕,郑志明,薛凯喜.砂岩短时单轴直接拉伸蠕变特性试验研究[J].实验力学,2011,26(2):190~195 |
砂岩短时单轴直接拉伸蠕变特性试验研究 |
Experimental Study of Creep Behavior in Uniaxial Short-term Direct Tensile Test of Red Sandstone |
投稿时间:2010-09-30 修订日期:2010-12-18 |
DOI: |
中文关键词: 蠕变 蠕变模型 直接拉伸 |
英文关键词:creep creep model direct tension |
基金项目:国家自然科学基金(50808187);交通部西部交通建设科技项目(2009318000001);重庆大学研究生创新团队项目(200909C1018) |
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中文摘要: |
采用自行设计加工的挂重型岩石材料直接拉伸装置,对重庆市某地红砂岩进行了短时分级加载单轴直接拉伸蠕变试验,并对该砂岩的蠕变特性进行了分析。结果表明,砂岩在该试验条件下具有明显的蠕变特性,其蠕变表现为衰减蠕变和稳态蠕变两个阶段,砂岩蠕变量与稳态蠕变速率随着荷载的增加而增加。应用三参量广义Kelvin模型与Burgers蠕变模型描述该砂岩的蠕变规律,结果表明,两个模型均可以准确描述该砂岩的蠕变特性,其中,Burgers蠕变模型效果更佳。本文所得结论可为从事相关研究的工作人员提供一定的借鉴 |
英文摘要: |
This paper presents the results of short-term multi-stage loading uniaxial direct tension creep experiment for the red sandstone sampled from Chongqing region based on a self-developed apparatus. A series of test was performed and corresponding creep characteristics were analyzed. Results show that under experimental condition, red sandstone presents obvious creep characteristics and its creep can be divided into two stages, that is decay creep and steady-state creep, respectively. Additionally, the total creep value and the rate of steady-state creep increase along with the tension load increase. Two specific constitutive models for creep deformation state description were proposed, namely, the three-parameter Kelvin model and the Burgers creep model. Model prediction was also compared with experimental results. Comparison shows that predict results agree closely with the experimental results. However, Burgers creep deformation model is a better model to predict creep deformation characterization for red sandstone from Chongqing region. These conclusions may be valuable for researchers interested in this topic. |
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