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李利峰,张晓虎,邓慧琳,等. 加载速率对实时高温花岗岩三轴力学特性影响的实验研究[J]. 科学技术与工程, 2020, 20(16): 6397-6403.
Li Li-feng,Zhang Xiao-hu,Deng Hui-lin,et al.Experimental study on the effect of loading rate on triaxial mechanical properties of real-time high temperature granite[J].Science Technology and Engineering,2020,20(16):6397-6403.
加载速率对实时高温花岗岩三轴力学特性影响的实验研究
Experimental study on the effect of loading rate on triaxial mechanical properties of real-time high temperature granite
投稿时间:2019-09-30  修订日期:2020-02-23
DOI:
中文关键词:  加载速率  高温花岗岩 三轴力学特性  损伤方程
英文关键词:Loading  rate high  temperature granite  triaxial mechanical  properties damage  equation
基金项目:贵州省科技厅联合基金(黔科合LH字[2015]7589号,黔科合J字[2013]2011号);贵州省科技计划项目(黔科合平台人才[2018]5622)
           
作者单位
李利峰 贵州工程应用技术学院
张晓虎 贵州工程应用技术学院
邓慧琳 贵州工程应用技术学院理学院
韩六平 贵州工程应用技术学院
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中文摘要:
      本文以未风化花岗岩为实验对象,在高温高压三轴力学实验系统上开展三轴压缩实验,分析了三种加载速率下岩样温度、围压对峰值强度、弹性模量的影响,探讨了岩样热损伤演化规律的加载速率效应,建立了花岗岩冷损伤方程。结果显示:在100 ℃时,加载速率增大,低围压区岩石由延性转向脆性,渐进破坏向突发失稳转变;在500 ℃时,加载速率增大,低围压区弹性模量硬化明显,失稳模式为准突发失稳;随着加载速率的增大,在低温30 ℃~200 ℃时峰值强度的增加显著,在较高温度200 ℃~500 ℃时峰值强度的增加幅度降低,随着围压的升高,加载速率使峰值强度增强作用降低;各级岩石温度条件下,加载速率与弹性模量相关性不显著;低围压时弹性模量增幅较大,高围压时弹性模量增幅较小;随着加载速率的提高,弹性模量损伤与岩石温度的关系由线性转变为非线性的临界围压降低。
英文摘要:
      In this paper, the unweathered granite was used as the experimental object, and the triaxial compression test was carried out on the high temperature and high pressure triaxial mechanical experiment system. The effects of rock sample temperature, confining pressure on peak strength and elastic modulus at three loading rates were analyzed. The loading rate effect of the thermal damage evolution law is established, and the cold damage equation of granite is established. The results show that: At 100 ℃, the loading rate increases, the rock in the low confining pressure zone changes from ductile to brittle, and the progressive failure changes to sudden instability; at 500 ℃, the loading rate increases, and the elasticity of the low confining pressure zone The modulus hardening is obvious, the instability mode is quasi-burst instability; With the increase of loading rate, the peak intensity increases significantly at low temperature 30 ℃~200 ℃, at higher temperature 200 ℃~500 ℃. The increase of peak intensity decreases. As the confining pressure increases, the loading rate decreases the peak strength enhancement. Under the rock temperature conditions, the correlation between loading rate and elastic modulus is not significant; elasticity at low confining pressure. The modulus increases greatly, and the elastic modulus increases at a high confining pressure. As the loading rate increases, the relationship between elastic modulus damage and rock temperature decreases from linear to nonlinear critical confining pressure.
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