Factors Affecting the Construction of Shallow Buried Tunnels Passing Through Existing Steel High-Voltage Towers
To analyze the impact of the shallow buried tunnel construction on the existing steel high-voltage iron towers,a two-dimensional numerical analysis model was established for the Damoshan Tunnel project.The safety of the tunnel excavation plan is verified,and the sensitivity factor analysis on the settlement of the tunnel arch top during the construction of the tunnel under the existing steel high-voltage tower is carried out by using the orthogonal experimental method.The effects of the tunnel embedment depth,the horizontal distance between the tunnel and the steel tower,excavation method,and changes in tunnel width on the vertical displacement of the tunnel arch top are evaluated.The following conclusions are drawn:1)Surface grou-ting can effectively control the settlement of steel tower foundations and has a significant effect on preventing the tower instabil-ity.2)The conclusion of the orthogonal experiment indicates that the embedment depth has a controlling effect on the settle-ment of the tunnel arch crown.As the depth of the tunnel increases,the settlement of the tunnel arch shows a downward trend.The increase in the horizontal distance between the tunnel and the center of the steel tower,as well as the width of the tunnel,will increase the settlement of the tunnel arch.The research results have some guiding and reference significance for the tunnel construction under similar conditions and the protection of adjacent existing buildings and structures.
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