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准确而又方便的确定双线隧道开挖引起的位移是工程实践中经常遇到的问题。以地铁区间隧道施工为工程背景,运用FLAC3D数值模拟,并结合现场实测数据,探讨了双线隧道开挖所引起的地表沉降规律。研究结果表明:地表沉降变形趋于稳定后,地表总沉降值等于开挖左线隧道和开挖右线隧道沉降变形稳定后所引起的地表沉降值之和;后行开挖隧道所引起的地表沉降值大于先行开挖隧道所引起的地表沉降值;当双线隧道间距较小时,沉降槽曲线为“单峰”形态,而双线隧道间距较大时,会呈现“双峰”特征。其研究成果可为双线隧道设计和施工提供参考。
Accurate and convenient to determine the displacement caused by double-line tunnel excavation is often encountered in engineering practice problems. Taking subway tunnel construction as the engineering background, FLAC3D numerical simulation was used to analyze the law of surface subsidence caused by double-line tunnel excavation based on field measurements. The results show that the total surface subsidence is equal to the sum of the surface subsidence caused by the settlement stability of the tunnel on the left and the right of the excavated tunnel. The settlement value is larger than the ground settlement value caused by the tunnel excavating in advance; when the spacing of the two-lane tunnel is small, the curve of the settling tank is in the shape of “single peak”, while when the distance between the two-lane tunnel is large, "feature. The research results can provide references for double-track tunnel design and construction.