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| 高温持续作用时间对砂岩动态力学特性影响试验研究 |
| Experimental Study on the Influence of High Temperature Duration on Dynamic Mechanical Properties of Sandstone |
| 投稿时间：2025-08-08 修订日期：2025-10-02 |
| DOI： |
| 中文关键词: 岩石动力学 高温持续作用 动态压缩 破碎形态 SHPB |
| 英文关键词: Rock dynamics high temperature sustained effect dynamic compression broken form SHPB |
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| 中文摘要: |
| 采用800 ℃高温对砂岩试件进行5种不同时间的持续作用，测量基本物理参数、矿物成分和微观结构形貌，研究高温持续作用时间对砂岩的物化损伤机制，并利用SHPB试验装置进行冲击压缩试验，结合高速摄像技术记录试件破坏过程。结果表明：试件质量损失率、体积膨胀率和密度减小率均随高温持续作用时间增加呈增大趋势，达到8 h后变化幅度减缓；当高温持续作用达到8 h后，天然砂岩中的碳酸钙(CaCO3)逐渐分解为氧化钙(CaO)和二氧化碳(CO?)；随高温持续作用时间增加，砂岩试件动应力—应变曲线向右下方移动，动抗压强度和动应变以指数函数关系分别呈减小和增大趋势，平均应变率以幂函数关系呈增大趋势；试件平均粒径随高温持续作用时间增加而减小，破坏模式由沿加载方向产生裂纹呈剥落式破坏演变为中心破坏扩散至四周。 |
| 英文摘要: |
| The sandstone specimens were subjected to continuous action at 800 °C for five different times. The basic physical parameters, mineral composition and microstructure morphology were measured to study the physical and chemical damage mechanism of sandstone under high temperature continuous action time. The impact compression test was carried out by SHPB test device, and the failure process of the specimen was recorded by high-speed camera technology. The results show that the mass loss rate, volume expansion rate and density reduction rate of the specimens increase with the increase of high temperature duration, and the change range slows down after 8 h. When the high temperature continued for 8 h, the calcium carbonate ( CaCO3 ) in natural sandstone gradually decomposed into calcium oxide ( CaO ) and carbon dioxide ( CO2 ). With the increase of high temperature duration, the dynamic stress-strain curve of sandstone specimens moves to the lower right. The dynamic compressive strength and dynamic strain show a decreasing and increasing trend in exponential function respectively, and the average strain rate shows an increasing trend in power function. The average particle size of the specimen decreases with the increase of the continuous action time of the high temperature, and the failure mode evolves from the spalling failure along the loading direction to the central failure diffusion to the surrounding. |
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