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在地铁隧道盾构法施工时,地表沉降值是衡量开挖方式是否合适的关键,因此监测和预测地表沉降有重要的实际意义。本文结合西安地铁某区间盾构隧道施工情况,以概率积分法为基础,对其隧道开挖引起的横向和纵向的地表沉降趋势进行预测,用实测值来验证预测沉降曲线的吻合程度。进行对比分析得出,预测结果与沉降实测的趋势基本一致,概率积分法可以较好地反映出隧道沉降的发展趋势,为地表沉降的动态研究开辟了新的有效途径,对后续工程施工具有指导意义。
In the construction of metro tunnel shield method, the value of surface subsidence is the key to evaluate the suitability of the excavation method. Therefore, monitoring and predicting surface subsidence have important practical significance. In this paper, based on the construction of shield tunnel in a certain section of Xi’an metro, based on the probability integral method, the horizontal and vertical ground settlement trends induced by tunnel excavation are predicted. The measured values are used to verify the coincidence degree of predicted settlement curves. The results show that the prediction results are basically the same as the actual measured settlement, and the probability integral method can well reflect the trend of the settlement of the tunnel, which opens up new and effective ways for the dynamic study of surface subsidence and has guidance for the subsequent construction significance.