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瑞典s p硬岩地下实验室开展的APSE试验的主要目的在于分析岩柱在开挖及加热过程中的力学响应及渐进破坏过程,其岩柱热–力耦合特性的数值模拟研究是国际合作研究计划DECOVALEX-2011项目的3大研究课题之一。采用热弹性耦合模型研究了APSE岩柱在开挖及加热过程中的应力、变形及温度变化规律,表明热弹性耦合模型对完整致密岩体的热-力耦合特性具有较好的描述能力,计算结果总体上反映了岩柱在开挖及加热过程中的应力调整和温度变化特征,并可对岩柱壁面的破坏特征及扩展规律进行定性解释。但因缺乏对岩体中多相流运动过程和渐进破坏过程的描述能力,热弹性耦合模型也表现出较大的局限性。研究成果对中国北山预选区核废料硬岩储库围岩的稳定性评价具有一定的参考意义。
The main purpose of the APSE test carried out by Swedish sp Hard Rock Underground Laboratory is to analyze the mechanical response and gradual failure process of rock columns during excavation and heating. The numerical simulation of the thermal-mechanical coupling characteristics of rock columns is an international cooperation Research Project DECOVALEX-2011 project one of the three major research topics. The thermoelastic coupling model was used to study the stress, deformation and temperature variation of the APSE rock columns during excavation and heating. The results show that the thermo-elastic coupling model has a good descriptive ability for the thermo-mechanical coupling characteristics of intact dense rock mass. The results generally reflect the characteristics of stress adjustment and temperature variation during excavation and heating of rock pillars, and can qualitatively explain the damage characteristics and expansion laws of the rock column wall. However, the thermo-elastic coupling model also shows great limitations due to the lack of describing ability of multiphase flow in rock mass and progressive destructive process. The research results have some reference significance for the stability evaluation of surrounding rocks of nuclear waste hard rock reservoir in the Beishan Preselected Area in China.