(中南大學(xué) 資源與安全工程學(xué)院，長沙 410083)
摘 要: 運用帶有加熱裝置的電液伺服材料試驗機對熱處理后和高溫下的花崗巖進(jìn)行了靜態(tài)力學(xué)實驗。分析了兩種狀態(tài)下花崗巖的應(yīng)力-應(yīng)變曲線及峰值強度、峰值應(yīng)變和彈性模量隨溫度的變化規(guī)律，并且探討了兩種狀態(tài)下巖石的破壞形態(tài)。結(jié)果顯示，與熱處理后的花崗巖相比，高溫下花崗巖脆-延轉(zhuǎn)變的臨界溫度更低, 壓密階段更長，彈性模量更小且損傷更大。此外，與熱處理后的花崗巖相比較，高溫下花崗巖的峰值應(yīng)力更小，然而峰值應(yīng)變卻更大，且兩者都隨著溫度的升高變化更加顯著。另外，高溫處理后和高溫下花崗巖的破壞形態(tài)明顯不同。低于100 °C時，兩種狀態(tài)下花崗巖的破壞形態(tài)相同，皆表現(xiàn)為劈裂破壞。然而，高于100 °C后，熱處理后和高溫下花崗巖的破壞形態(tài)分別表現(xiàn)為劈裂破壞和剪切破壞。
關(guān)鍵字: 花崗巖；熱處理；高溫作用；靜態(tài)力學(xué)性質(zhì)；破壞特性
（School of Resources and Safety Engineering, Central South University, Changsha 410083, China）
Abstract:Static mechanical experiments were carried out on granite after and under different temperatures using an electro- hydraulic and servo-controlled material testing machine with a heating device. Variations in obvious form, stress-strain curve, peak strength, peak strain and elastic modulus with temperature were analyzed and the essence of rock failure modes was explored. The results indicate that, compared with granite after the high temperature treatment, the brittle-ductile transition critical temperature is lower, the densification stage is longer, the elastic modulus is smaller and the damage is larger under high temperature. In addition, the peak stress is lower and the peak strain is greater, but both of them change more obviously with the increase of temperature compared with that of granite after the high temperature treatment. Furthermore, the failure modes of granite after the high temperature treatment and under high temperature show a remarkable difference. Below 100 °C, the failure modes of granite under both conditions are the same, presenting splitting failure. However, after 100 °C, the failure modes of granite after the high temperature treatment and under high temperature present splitting failure and shear failure, respectively.
Key words: granite; thermal treatment; high temperature effect; static mechanical properties; failure properties
