【摘要】：在放射性核廢料處置、地熱能源開采以及地下油氣儲存等工程中,熱量的傳遞將會在很大程度上改變巖土材料的力學性質,因此,巖土體及緩沖材料的熱力學參數,包括熱傳導系數、熱膨脹系數、比熱容對工程設計以及安全性評價有著至關重要的作用。利用自主研制的巖石膨脹系數測試儀對含層理砂巖進行了熱膨脹系數試驗,研究了巖石軸向和徑向熱膨脹系數的變化規(guī)律,結果表明:對于含水平層理巖樣,隨著溫度的變化,當膨脹均勻后,軸向熱膨脹系數約為14×10~(-6)℃~(-1),而徑向熱膨脹系數約為9×10~(-6)℃~(-1),前者約為后者的1.56倍,表現(xiàn)出明顯的各向異性;相比于含水平層理巖樣,含豎直或傾斜層理巖樣的軸向膨脹系數未見顯著差異,但徑向熱膨脹系數明顯增加;相同溫度下,徑向熱膨脹系數從大到小的順序為:豎直方向、傾斜方向和水平方向;由于巖樣中沉積層的存在,砂巖與沉積物質的膨脹性能并不相同,這將導致巖樣的軸向和徑向熱膨脹系數表現(xiàn)出各向異性。該研究成果對于巖體的熱-力耦合特性研究具有一定的參考意義。
[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，

本文編號：2499825