本文選題：巖石力學(xué) + 黏性系數(shù)　； 參考：《巖石力學(xué)與工程學(xué)報》2017年10期

【摘要】：利用擺錘沖擊加載SHPB試驗裝置,進(jìn)行砂巖和人造巖心長桿沖擊試驗和動態(tài)巴西盤試驗,測試砂巖和人造巖心的黏性系數(shù),分析砂巖和人造巖心強(qiáng)度的加載率效應(yīng)。利用試驗和數(shù)值模擬相結(jié)合的方法得到綠砂巖、人造巖心A和B的黏性系數(shù)分別為100,10和5 k Pa·s。開展不同黏性巖石的動態(tài)巴西盤試驗,測得砂巖和人造巖心試樣的動態(tài)抗拉強(qiáng)度隨著加載率的增大而增大,表現(xiàn)出一定的加載率相關(guān)性;證明了黏性對巖石強(qiáng)度加載率效應(yīng)的影響,但兩者并非正相關(guān);在較小的加載速率下,巖石黏性導(dǎo)致試樣中傳播的應(yīng)力波能量衰減,在巴西盤中心點起裂的裂紋沿加載直徑方向擴(kuò)展但是不足以使試樣破壞成兩半,從而驗證了巴西盤裂紋起裂位置。
[Abstract]:The impact test of sandstone and manmade core with long rod and dynamic Brazilian disk test was carried out by means of pendulum impact loading SHPB test device. The viscosity coefficient of sandstone and artificial core was tested, and the effect of loading rate on the strength of sandstone and artificial core was analyzed.Using the method of test and numerical simulation, the viscosity coefficients of artificial core A and B are 100 ~ 10 and 5 KSPA, respectively.The dynamic Brazilian plate test of different viscous rocks shows that the dynamic tensile strength of sandstone and artificial core increases with the increase of loading rate, showing a certain correlation of loading rate.It is proved that the effect of viscosity on the loading rate of rock strength is not positively correlated, and that the viscosity of rock leads to the attenuation of the energy of the stress wave propagating in the specimen at a small loading rate.The crack at the center of the Brazilian disk propagates along the direction of the loading diameter but is not sufficient to break the specimen into two halves, thus validating the crack initiation position in the Brazilian disk.
【作者單位】： 東北大學(xué)巖石破裂與失穩(wěn)研究所;
【基金】：國家重點研發(fā)項目(2016YFC0801607) 國家自然科學(xué)基金資助項目(51525402) 中央高校基本科研業(yè)務(wù)費(fèi)項目(N160103005)~~
【分類號】：TU45
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本文編號：1771090