铣削钢纤维在盾构隧洞内衬混凝土结构防裂中的试验研究OA

The lining concrete structure of shield tunnel is prone to cracking under complex loads such as temperature stress and internal and external water pressure,which affects the safety and durability of the tunnel structure.In order to improve the crack resistance of the lining concrete structure of shield tunnels,the key technical issues of improving the performance of high-strength pumped concrete by adding steel ingots,milling steel fibers,fly ash,and ground mineral powder materials were studied.The research results indicate that the reasonable addition of steel fiber,fly ash,and ground mineral powder in steel ingot milling has little effect on the compressive strength,workability,and pumpability of concrete,but its crack resistance performance is significantly improved,providing a feasible technical path for effectively solving the crack problem of thin-walled high-strength pumping concrete structures.The research results can provide useful reference for the design and construction of similar structures.