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盾构隧道开挖的模拟方法是对隧道-土-结构物相互作用进行三维数值分析的重要考虑因素。对两种典型的模拟方法进行了探讨,一种是更接近真实施工过程的分步开挖法,另一种则是简化的一步通长开挖应力释放法。对比分析表明,两种方法对于地面沉降的预测结果比较接近,而对于邻近桩基础的预测结果之间的差异也不是太大。同时,一步通长开挖应力释放法能得到不同的地层损失,并且建模简单,能够较好地用于分析隧道开挖对地面建筑物及周边地下结构物的影响。
The simulation method of shield tunneling is an important consideration for the three-dimensional numerical analysis of the tunnel-soil-structure interaction. Two typical simulation methods are discussed, one is the step-by-step excavation approach that is closer to the real construction process, and the other is the simplified one-step long-length excavation stress release method. The comparative analysis shows that the two methods are close to the predictions of land subsidence and the differences between the predicted results of adjacent pile foundations are not too large. At the same time, the one-step long-length excavation stress relief method can get different formation losses, and the modeling is simple and can be well used to analyze the influence of tunnel excavation on the ground buildings and surrounding underground structures.