本文選題：巖石力學 + 隧洞　； 參考：《巖石力學與工程學報》2017年07期

【摘要】：為了深入認識深部圓形隧洞中板裂屈曲巖爆的發(fā)生機制,采用大尺寸真三軸巖石試驗系統(tǒng)對含預(yù)制孔洞紅砂巖立方體(100 mm×100 mm×100 mm)試樣進行模擬試驗研究。首先根據(jù)地應(yīng)力隨深度分布規(guī)律,在水平向垂直隧洞軸向方向設(shè)定最小主應(yīng)力,豎直向垂直隧洞軸向方向設(shè)定最大主應(yīng)力,在3個方向分別加載到初始應(yīng)力狀態(tài)。然后保持另外2個方向應(yīng)力不變,在豎直向垂直隧洞軸向方向進行加載直至隧洞洞壁圍巖發(fā)生破壞,并且在保證試樣整體不發(fā)生破壞條件下,逐級加載至洞壁發(fā)生巖爆。利用安裝的微型攝像機對試驗過程中洞壁圍巖破壞全過程進行實時監(jiān)測和記錄,結(jié)合三維加載和洞壁受力情況,再現(xiàn)了深埋硬巖圓形隧洞板裂屈曲巖爆全過程。研究結(jié)果表明:巖爆過程可劃分為平靜期、細顆粒彈射和剝落期、板裂屈曲破壞和強烈破壞四個時期。巖爆可滯后應(yīng)力發(fā)生,具有時間效應(yīng),并且受加載率影響明顯。巖爆破壞深度達到更高靜應(yīng)力水平下的穩(wěn)定狀態(tài),形成的V 型槽具有應(yīng)力不敏感期;通過合理優(yōu)化隧洞斷面幾何參數(shù),可發(fā)揮結(jié)構(gòu)強度尺寸效應(yīng),對巖爆發(fā)生起一定抑制作用。
[Abstract]:In order to deeply understand the mechanism of buckling rock burst in deep circular tunnel, a large size true triaxial rock test system was used to simulate the specimen containing 100 mm 脳 100 mm red sandstone with prefabricated holes. Firstly, according to the distribution of ground stress with depth, the minimum principal stress is set in the axial direction of the horizontal vertical tunnel, the maximum principal stress is set in the axial direction of the vertical tunnel, and the initial stress is loaded into the initial stress state in three directions respectively. Then the stress of the other two directions is kept unchanged, loading in the vertical tunnel axial direction until the surrounding rock of the tunnel wall is destroyed, and under the condition that the whole specimen is not destroyed, the rockburst occurs step by step to the wall of the tunnel. The whole process of wall rock failure is monitored and recorded by using the installed micro camera. Combined with 3D loading and wall loading, the whole process of deep buried hard rock circular tunnel slab crack buckling and rockburst is reappeared. The results show that the rock burst process can be divided into four periods: calming period, fine grain ejection and spalling stage, buckling failure of plate crack and strong failure. Rock burst can cause delayed stress, which has time effect and is obviously affected by loading rate. The rock burst failure depth reaches the stable state under the Gao Jing stress level, and the V-shaped groove has a stress insensitive period, and the structural strength size effect can be brought into play by optimizing the geometric parameters of the tunnel section reasonably. It can inhibit the occurrence of rock burst to some extent.
【作者單位】： 中南大學資源與安全工程學院;中南大學高等研究中心工程材料力學研究所;
【基金】：國家自然科學基金資助項目(41472269) 國家重點研發(fā)計劃項目(2016YFC0600706) 中南大學中央高�；究蒲袠I(yè)務(wù)費專項資金項目(2017zzts167)~~
【分類號】：TV554

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本文編號：1925283