Analysis of Influencing Factors of Tunnel Blasting Excavation on Adjacent DAMS Under Seepage and Stress Coupling
In order to study the safety of dams in nearby reservoirs under the action of tunnel blasting construction,taking Machekeng Reservoir in the exit section of the Fangjun tunnel of the Yidong Expressway of Zhejiang Province as the research object,the vibration failure process of dams was described through theoretical analysis.The numerical simu-lation tool in MIDAS GTS NX is used to discusse the influence of different explosive amounts and distances between the center of detonation and the water level in front of the dam on the stability of the reservoir dam.The change law of the stress and vibration velocity of the reservoir dam is revealed.Furthermore,the Morris screening method is introduced to evaluate the influencing degree of each factor.The results show that the primary and secondary relationships among con-trolling variables affecting the stability of the dam are as follows:explosive quantity>distance from the center of deto-nation>water level in front of the dam;The peak stress and peak vibration velocity of the dam increase with the increase in the amount of explosive in the tunnel,the increase in the water level in front of the dam,and the decrease in the deto-nation distance.In tunnel blasting construction,the damage to reservoir dams can be minimized by means of discharging reservoir water in advance,controlling the amount of explosive and the distance between the blast centers,etc.The re-search conclusion can provide a reference for the safety protection of reservoirs during tunnel blasting construction.
reservoir damseepage and stress couplingtunnel blastinginfluencing factornumerical analysis
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