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以明月山隧道进口浅埋段为工程背景,介绍了采用弹塑性有限元法对施工过程进行模拟的原理及实现方法。模拟计算表明,采用径向锚杆支护条件下,在开挖支护结束后,围岩水平方向产生的最大位移发生在第二步开挖结束后,且位于左腰处,隧道拱顶处出现最大竖直位移,喷砼的轴应力随着下断面的开挖而增大,且拱顶轴应力最大。隧道开挖支护结束后,整个锚杆都是处于受拉状态,拱腰处的轴力最大,锚杆轴力沿着锚杆向外逐渐减小。
Taking the shallow buried section of the entrance of Mingyue Mountain Tunnel as the engineering background, the principle and implementation method of the elastoplastic finite element method for simulating the construction process are introduced. The simulation results show that under the condition of radial bolt support, the maximum displacement in the horizontal direction of surrounding rock occurs after excavation and support, and is located at the left waist and at the vault of the tunnel With the maximum vertical displacement, the axial stress of shotcrete increases with the excavation of the lower section, and the stress of the vault axis is the largest. After tunnel excavation and support, the entire bolt is in tension, and the axial force at the arch waist is the largest. The axial force of the bolt gradually decreases along the bolt.