Design Change Optimization Plan for the Floor Drum of Gently Inclined Soft Rock Tunnel
Based on the project of Jiuwan Dashan No.1 Tunnel of the Guiyang-Nanning High-speed Railway,and combined with the physical property index test of the surrounding rock in the gently inclined soft rock strata of the high-speed railway tunnel and the analysis of the deformation mechanism of the tunnel floor drum,this article sets out from the control points and measures of the gently inclined soft rock tunnel floor drum,and proposes a design change optimization plan of deepening the inverted arch,adjusting the curvature of the inverted arch structure,and strengthening the supporting strength and stiffness of the inverted arch for similar diseases such as the bottom structure uplift in the gently inclined soft rock strata section.The contour and thickness of the arch wall in the surrounding rock area will remain unchanged from the original design.The tunnel bottom structure will be adjusted to 1/8 of the inverted arch curvature,and the inverted arch thickness will be adjusted to 70 cm in a modified design.And the control of blasting will be strengthened to reduce disturbance to the surrounding rock.
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