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为保证高温过程中岩石工程的稳定性和安全性并解决煤炭地下气化过程中气化炉围岩的维护问题,采用高温加热炉和扫描电子显微镜研究了高温双向约束条件下石灰岩膨胀应力的变化规律.试验结果表明:石灰岩的膨胀应力随温度的增加逐渐增大,恒温结束时石灰岩的膨胀应力为刚达到该温度时初始值的1.2~1.7倍;各温度段之间石灰岩膨胀应力和加热温度近似呈线性关系,并且各温度段的曲线斜率逐步增大,恒温60 min后膨胀应力趋于各温度水平的稳定值;高温过程中,石灰岩膨胀应力经历了3个阶段:加热升温阶段、恒温膨胀应力增大阶段、膨胀应力稳定阶段;高温过程中石灰岩膨胀应力的变化与其微观结构变化密切相关.
In order to ensure the stability and safety of rock engineering during the high temperature process and to solve the problem of the maintenance of the surrounding rock of the gasifier in the process of underground gasification in coal, the change of the expansion stress of limestone under the high temperature two-way constraint was studied by using high temperature furnace and scanning electron microscope The results show that the expansion stress of limestone increases with the increase of temperature, and the expansion stress of limestone at the end of constant temperature is 1.2-1.7 times that of initial value of limestone. The stress of expansion of limestone and the heating temperature And the slope of each curve increases gradually. After 60 min of constant temperature, the expansion stress tends to the steady value of each temperature level. During the high temperature process, the expansion stress of limestone undergoes three stages: heating and heating stage, constant temperature expansion The stage of stress increase and the stage of expansion stress stabilization. The change of limestone expansion stress is closely related to its microstructure change during high temperature.