含层理砂岩热膨胀系数的试验研究

发布时间：2019-06-15 00:24

【摘要】：在放射性核废料处置、地热能源开采以及地下油气储存等工程中,热量的传递将会在很大程度上改变岩土材料的力学性质,因此,岩土体及缓冲材料的热力学参数,包括热传导系数、热膨胀系数、比热容对工程设计以及安全性评价有着至关重要的作用。利用自主研制的岩石膨胀系数测试仪对含层理砂岩进行了热膨胀系数试验,研究了岩石轴向和径向热膨胀系数的变化规律,结果表明:对于含水平层理岩样,随着温度的变化,当膨胀均匀后,轴向热膨胀系数约为14×10~(-6)℃~(-1),而径向热膨胀系数约为9×10~(-6)℃~(-1),前者约为后者的1.56倍,表现出明显的各向异性;相比于含水平层理岩样,含竖直或倾斜层理岩样的轴向膨胀系数未见显著差异,但径向热膨胀系数明显增加;相同温度下,径向热膨胀系数从大到小的顺序为:竖直方向、倾斜方向和水平方向;由于岩样中沉积层的存在,砂岩与沉积物质的膨胀性能并不相同,这将导致岩样的轴向和径向热膨胀系数表现出各向异性。该研究成果对于岩体的热-力耦合特性研究具有一定的参考意义。
[Abstract]:In the engineering of radioactive nuclear waste disposal, geothermal energy exploitation and underground oil and gas storage, the heat transfer will change the mechanical properties of geotechnical materials to a great extent. therefore, the thermodynamic parameters of rock, soil and buffer materials, including heat conduction coefficient, thermal expansion coefficient and specific heat capacity, play an important role in engineering design and safety evaluation. The thermal expansion coefficient of bedding sandstone was tested by using a self-developed rock expansion coefficient tester, and the variation of axial and radial thermal expansion coefficient of rock was studied. The results show that for horizontal bedding samples, when the expansion is uniform, the axial thermal expansion coefficient is about 14 脳 10 ~ (- 6) 鈩，

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