Analysis of the Influence of Tunnel Blasting Construction on the Safety of Adjacent Dams
The impact of tunnel blasting construction on the safety of the dam body close to Machekeng Reservoir was investigated by taking the Yidong Expressway's Fangjun Tunnel project as object.The concrete damage idea elaborated on the dam's breakdown process.A three-dimensional numerical model of the tunnel-dam was established using the finite ele-ment program MIDAS GTS NX.The total stability of the dam was evaluated by analyzing the peak values of the vibration velocity,stress,displacement,and the dynamic safety factor of the dam slope.The results reveal that when the blasting center distance is 100 m,the tensile stress can reach 0.1 kPa,and the dam damage from tunnel blasting is essentially minimal.The tunnel's blasting vibration will produce minor settling deformations in the dam body.The greatest displace-ment point is located in the center of the dam body.When the blasting center distance is 70 m,the minimal Y-direction displacement value is approximately 0.42 mm.In the reservoir dam field monitoring,the maximum value of vibration ve-locity is 5.65 cm/s.In the simulation result,the maximum peak value of vibration velocity is 2.6 cm/s,and the lowest value of the dam slope's dynamic safety factor is 1.034.All of the findings are within a safe range,which demonstrate that the dam body of the neighboring reservoir is still in a generally stable state following the blasting construction of the tunnel exit section.The research technique can be used as a model for future studies.
万方数据
维普
