岩石热冲击研究初探

在激光辐照砂岩和大理岩的试验中,在不超过5 mm深度可以测试到应力波作用,而超过8 mm的深度则基本为一种声波扰动。由于岩石试样加工困难,没有测试到岩样中的冲击波波形。基于此分析,初步形成分析岩石热冲击效应的分析方法,得到相应的温度场和压力场,初步分析结果与实验现象基本符合。须注意的是,岩石中热力耦合效应比应力波和冲击波慢得多,是一个较长时间的效应。

A PRELIMINARY INVESTIGATION OF ROCKS SUBJECTED TO THERMAL SHOCK

Shock wave generated in thermal shock decays quickly with the distance of wave propagation for the complicated structural features of rock materials.In the experiments of sand stone and marble under the shock of laser,the stress wave is recorded when the distance is less than 5 mm and the sonic wave is recorded when the distance is greater than 8 mm.However,no shock wave is recorded for the difficulty of rock sample preparation.Based on the experimental results and the analyses,corresponding process of thermal shock is analyzed and a preliminary method to analyze the thermal shock in rock is formed.Some calculated pressure field and temperature field are obtained,and the results are consistent with those of the experiment.The attention should be paid to the law that the coupled thermo-mechanical effect is much slower than the stress wave and the shock wave,and comparing with the wave propagation,it is a long-term effect.