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利用模型材料制作了孔隙岩石物理模型,利用CT扫描和统计学原理获得了物理模型内部孔隙数量、孔隙空间位置和孔隙间距等分布特征,通过不同孔隙率物理模型温度作用下的单轴压缩试验,分析了温度作用后孔隙物理模型的抗压强度、弹性模量和泊松比等力学参数与温度和孔隙率之间的关系,运用CT扫描试验探讨了温度作用下孔隙微观结构的演化规律。研究发现:孔隙物理模型与天然孔隙岩石相比具有较好的几何相似性和一致的孔隙结构分布特征;随着作用温度点的升高,同一孔隙率的物理模型的抗压强度基本呈上升趋势,孔隙率的增大减弱了温度对物理模型抗压强度的影响作用;在相同温度条件下,随着孔隙率的增加,物理模型的抗压强度呈下降趋势。随着作用温度点的升高,同一孔隙率的物理模型的弹性模量基本都呈下降趋势;随着温度的升高孔隙率对泊松比的影响逐渐减弱;温度引起物理模型内部孔隙几何形态和孔隙数量的改变是引起宏观力学参数发生变化的主要内因。150℃似乎可以作为温度对孔隙物理模型力学参数影响的一个门槛值。研究成果揭示了温度对岩石宏观力学性能及微观孔隙结构演化规律的影响机理。
The physical model of pore rock was made by using model materials. The distribution of pore volume, pore space and pore space in physical model was obtained by using CT scanning and statistical principle. Through the uniaxial compression test under different porosity physical model temperature, The relationship between mechanical parameters such as compressive strength, elastic modulus and Poisson ’s ratio and temperature and porosity were analyzed after the temperature was applied. The evolution of pore microstructure under the action of temperature was discussed by using CT scanning experiment. The results show that the physical model of pore has better geometric similarity and consistent distribution of pore structure than that of natural porous rock. With the increase of temperature, the compressive strength of the physical model with the same porosity increases basically , And the increase of porosity reduces the influence of temperature on the compressive strength of physical model. With the increase of porosity, the compressive strength of physical model shows a downward trend at the same temperature. With the increase of temperature, the elastic modulus of the physical model with the same porosity tends to decrease. With the increase of temperature, the influence of porosity on Poisson’s ratio gradually diminishes. The temperature causes the pore geometry in the physical model And the change of the number of pores is the main cause of macro-mechanical parameters change. 150 ° C seems to be a threshold for the effect of temperature on the mechanical parameters of the pore physical model. The research results reveal the mechanism of the influence of temperature on macroscopic mechanical properties of rock and the evolution of microscopic pore structure.