本文選題：超深埋隧道 + 應力特征�。� 參考：《鐵道工程學報》2017年04期

【摘要】：研究目的:超深埋折多山隧道是川藏鐵路雅康段控制性工程,隧址位于我國西部新構造運動活躍的"Y"字形構造帶核心區(qū)域,其地應力特征及巖爆預測對鐵路選線、設計和施工具有重要意義。本文通過地應力測試數(shù)據(jù),數(shù)值模擬來分析折多山隧道隧址區(qū)及洞身的應力分布特征,明確最大主應力的方向,并利用巖石的單軸加卸、載應力-應變曲線計算其隧道圍巖的巖爆傾向指數(shù),分析發(fā)生巖爆的巖石力學指標,結合深孔鉆探成果、巖石力學試驗、水文試驗成果來綜合分析川藏鐵路折多山隧道發(fā)生巖爆的強度。研究結論:(1)川藏鐵路折多山隧道最大主應力為水平應力,方向為NEE向,實測地應力最大值為17 MPa,數(shù)值模擬洞身最大值可達到48 MPa;(2)通過巖爆傾向性指數(shù)試驗分析可知,圍巖具備發(fā)生中等~強烈?guī)r爆的儲能和釋能條件;(3)通過綜合分析可知,折多山隧道易發(fā)生中等~強烈?guī)r爆;(4)該研究結論可為隧道設計提供依據(jù),也可為鄰近區(qū)域隧道圍巖穩(wěn)定性判斷提供借鑒。
[Abstract]:Objective: the ultra-deep buried folding mountain tunnel is a control project in Yakang section of Sichuan-Tibet railway. The tunnel is located in the core area of the "Y" zigzag structural belt with active neotectonic movement in the west of China. The geostress characteristics and rockburst prediction are used to select the railway line. Design and construction are of great significance. In this paper, the stress distribution characteristics of the tunnel site and the tunnel body are analyzed by means of the in-situ stress test data and numerical simulation, the direction of the maximum principal stress is determined, and the uniaxial unloading of the rock is used. The stress-strain curve is used to calculate the rock burst tendency index of the surrounding rock of the tunnel, and the rock mechanics index of the rock burst is analyzed. Combined with the results of deep hole drilling, the rock mechanics test is carried out. The results of hydrological test are used to analyze the strength of rockburst in Chuan-Tibet railway tunnel. It is concluded that the maximum principal stress of Chuan-Tibet Railway is horizontal stress, the direction is NEE, the measured maximum of in-situ stress is 17 MPA, and the maximum value of numerical simulation of tunnel body can reach 48 MPA / 2) through the analysis of rockburst propensity index test, it can be concluded that the maximum principal stress is horizontal stress, the direction is in NEE direction, and the measured maximum is 17 MPA. By comprehensive analysis, it can be concluded that the medium to strong rockburst is easy to occur in the Zhuandooshan tunnel) the research conclusion can provide the basis for the tunnel design. It can also be used for reference to judge the surrounding rock stability of adjacent tunnel.
【作者單位】： 成都理工大學;中鐵二院工程地質創(chuàng)新工作室;
【分類號】：U451

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