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3.3. Static Response Analysis 3.3.1. Analysis of Highway Tunnel Excavation Before the excavation of the highway tunnel and railway tunnel, an initial in situ stress equilibrium is established to determine the initial stress field. Figure 4 shows the initial in situ stress field, considering the absence of a 300 m high mountain body model. Instead, its influence is represented by an equivalent load of 7 MPa applied to the top of the numerical model.
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