高地温热害对隧道及围岩影响的研究进展

Research Progress of Influence of High Geothermal Hazards on Tunnels and Surrounding Rocks

高温地质热害对隧道衬砌及其围岩力学行为具有重要影响,为此,对高温热害对隧道衬砌及隧道围岩环境的影响进行了研究。研究结果表明:高地温引起的隧道内部热应力容易导致衬砌发生破坏,且会导致混凝土水化不完全,使得混凝土后期强度降低;同时,高地温还会引起岩土微观结构改变、孔隙率增大及围岩物理力学性质的改变。研究结论可为高地温地质条件下的隧道施工提供参考。

High geothermal hazards have an important impact on the mechanical behavior of tunnel linings and surrounding rocks.The research results show that the thermal stresses caused by high ground temperatures can easily lead to damage of linings and incomplete hydration of the concrete,which reduces the later strength of the concrete.While at the same time,the high ground temperature can also cause the change of rock and soil microstructure,the increase of porosity and the change of surrounding rock physical and mechanical properties.The findings of this study can be used as a reference for the construction of tunnels in high ground temperature geological conditions.