【摘要】：為探究溫度對(duì)煤巖靜、動(dòng)態(tài)力學(xué)特性的影響規(guī)律,首先采用箱式氛圍爐在準(zhǔn)真空環(huán)境下對(duì)直徑50 mm,高度分別為100和50 mm的2組無煙煤試樣進(jìn)行8種溫度水平的熱處理(20℃~500℃),然后分別利用液壓伺服試驗(yàn)機(jī)和分離式Hopkinson壓桿對(duì)2組試樣進(jìn)行靜態(tài)單軸壓縮和動(dòng)態(tài)沖擊試驗(yàn)。此外,還通過掃描電鏡和壓汞試驗(yàn)獲得各種溫度后煤樣的SEM圖像、孔隙率及孔徑分布。結(jié)果表明,煤樣熱損傷以300℃為界分為2個(gè)階段,分別以解吸、熱破裂等物理反應(yīng)和熱解化學(xué)反應(yīng)為主,孔隙率逐步變大且中大孔占比逐漸增加;煤巖承載和抗變形能力都隨溫度升高而逐步劣化,第二階段衰減趨勢較第一階段急劇,500℃后的靜、動(dòng)態(tài)抗壓強(qiáng)度分別降至常溫時(shí)的8.41%和16.94%。靜載條件下煤樣宏觀力學(xué)性能的溫度敏感性比動(dòng)態(tài)沖擊時(shí)顯著,抗壓強(qiáng)度和彈性模量的動(dòng)態(tài)增強(qiáng)因子隨溫度的變化規(guī)律不一致。
[Abstract]:In order to explore the influence of temperature on the static and dynamic mechanical properties of coal and rock, a box atmosphere furnace is used to solve the problem of 50 mm, diameter in quasi-vacuum environment. Two groups of anthracite samples with height of 100 mm and 50 mm were heat-treated at 8 temperature levels (20 鈩，

本文編號(hào)：2472609