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目前深埋硬岩隧道的岩爆等脆性破坏研究还较少考虑到温度的作用效应。采用精细网格数值模型,提出热-脆性-精细力学计算方法,应用能反映高地应力下硬岩脆性破坏特点的岩体劣化模型,结合能量计算指标,开展了不同温度作用下隧道硬岩脆性破坏的热力耦合分析。以瑞典APSE花岗岩隧洞岩柱为例,进行不同地温下隧道破坏区、能量释放值和应力指标的定量化对比研究。研究结果表明,隧道地温的增加将使岩体产生附加温度应力,进而增大其脆性破坏程度,计算结果与隧道现场的破坏规律基本一致。热-脆性-精细力学计算能合理描述硬岩的损伤和渐进破坏过程,计算结果较好地揭示了花岗岩等硬岩深埋隧道脆性破坏的温度作用效应,对于高应力、高地温下深部工程的稳定性评价具有指导意义。
At present, the research on brittle failure such as rockburst in the deep hard rock tunnel still seldom considers the effect of temperature. The fine-grid numerical model is used to calculate the thermal-brittle-fine mechanics. The rock mass degradation model which can reflect the brittle failure of high-strength rock under high ground stress is proposed. Combined with the energy calculation index, the brittle failure of the tunnel under different temperatures Thermal coupling analysis. Taking the rock column of APSE granite tunnel in Sweden as an example, quantitative comparison study on tunnel failure area, energy release value and stress index under different ground temperatures was carried out. The results show that the increase of tunnel temperature will cause additional temperature stress on the rock mass and further increase the degree of brittle failure. The calculated results are in good agreement with the damage laws at the tunnel site. Thermal-brittleness-precision mechanics calculation can reasonably describe the process of damage and progressive failure of hard rock. The calculation results reveal the effect of temperature on the brittle failure of deep hard-rock tunnels such as granite. For deep engineering under high stress and high ground temperature Stability evaluation is instructive.