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On the adaptability of CRD four steps method and six steps method for excavating super shallow tunnel, elastic-plastic simulation are executed by ANSYS and Mohr-coulomb criterion. The development and distribution of axial force and moment of two kinds of methods are compared. Analysis results indicate that the axial force and moment of CRD four steps method are larger than that of six steps method. It is comparatively obvious that the axial force and moment developed near the lateral contour of tunnel by both two methods. The CRD six steps method is better than four steps method for excavating super shallow tunnel and should be adopted in actual construction process.

Comparative Analysis on the Internal Force of CRD Method with different Steps for Excavating Super Shallow Tunnel