本文選題：巖石力學(xué) + 巷道�。� 參考：《巖石力學(xué)與工程學(xué)報(bào)》2017年06期

【摘要】：由于爆破開挖,巷道內(nèi)常含有徑向裂隙,并影響巷道的穩(wěn)定性,為了詳細(xì)地研究含徑向裂紋巷道在沖擊載荷作用下的動態(tài)斷裂行為,采用砂巖材料制作巷道模型試樣進(jìn)行中低速沖擊動態(tài)斷裂試驗(yàn),并采用AUTODYN有限差分軟件進(jìn)行數(shù)值模擬分析。分析巷道對稱軸線上的徑向裂紋在沖擊荷載作用下的擴(kuò)展特性及止裂現(xiàn)象,并采用試驗(yàn) 數(shù)值 解析法計(jì)算出裂紋的起裂韌度及擴(kuò)展速度等參數(shù)。研究結(jié)果表明:(1)巷道圍巖在靜力載荷作用和動力載荷作用下的破壞行為有較大差異,動力載荷下破壞僅是裂紋尖端處的起裂、擴(kuò)展;而靜力載荷下破壞除了發(fā)生在裂紋尖端處,也會在巷道拱肩、拱腳及兩側(cè)幫處發(fā)生破壞。(2)巷道對稱軸線上的裂紋在沖擊載荷下的擴(kuò)展路徑大致沿著裂紋的原方向擴(kuò)展,擴(kuò)展路徑中存在明顯的止裂現(xiàn)象。(3)采用試驗(yàn) 數(shù)值 解析法能夠較好地計(jì)算出裂紋的起裂速度及擴(kuò)展速度,進(jìn)一步采用位移外推法能夠求解出巷道內(nèi)裂紋的動態(tài)應(yīng)力強(qiáng)度因子時(shí)程曲線,利用測試的裂紋起裂時(shí)間確定起裂韌度。
[Abstract]:In order to study the dynamic fracture behavior of roadway with radial crack under impact load in detail, there are radial cracks in roadway due to blasting excavation, which affects the stability of roadway. The dynamic fracture test of medium and low speed impact was carried out by using sandstone material to make model sample of roadway, and the numerical simulation analysis was carried out by AUTODYN finite difference software. The propagation characteristics and crack stopping phenomena of radial crack on the symmetrical axis of roadway under impact load are analyzed. The crack initiation toughness and propagation velocity are calculated by means of numerical method. The results show that the failure behavior of roadway surrounding rock under static load and dynamic load is quite different. The failure under dynamic load is only the crack initiation and propagation at the crack tip, but the failure occurs at the crack tip under static load. There will also be damage in the arch shoulder, arch foot and both sides of the tunnel.) the propagation path of the crack on the symmetrical axis of the roadway under impact load is approximately along the original direction of the crack. The crack initiation velocity and propagation velocity can be well calculated by using the experimental numerical analysis method. Furthermore, the time-history curve of dynamic stress intensity factor can be calculated by displacement extrapolation, and the crack initiation toughness can be determined by the measured crack initiation time.
【作者單位】： 四川大學(xué)能源工程安全與災(zāi)害力學(xué)教育部重點(diǎn)實(shí)驗(yàn)室;四川大學(xué)建筑與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(11672194) 四川省科技計(jì)劃項(xiàng)目(2014JY0002) 成都理工大學(xué)油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實(shí)驗(yàn)室資助項(xiàng)目(PLN1505)~~
【分類號】：TU45
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本文編號：1947073