Abstract Based on the similarity ratio of 1:10, a tunnel secondary lining model was made in which the depth of a single longitudinal crown crack was one-third of the original lining thickness. With the ground resistance simulated as the spring, the radial load test of the tunnel secondary lining model was carried out, which was reinforced by the new cover arch separated with the original lining by additional waterproof broad, and the deformation law and failure mode of cracked lining after reinforced by separated cover arch were achieved. The results show that under the action of loosening pressure, the loading process of separated cover arch reinforced structure can be divided into three phases: initial loading-radial penetration of the prefabricated crack-radial penetration of the cover arch crown crack-failure of the specimen; the failure load is governed by the haunch section of original lining, and the overall failure property acts as the brittle failure with a failure sequence of key parts as crown cracking-haunch fracture-crown failure.
Abstract：
Based on the similarity ratio of 1:10, a tunnel secondary lining model was made in which the depth of a single longitudinal crown crack was one-third of the original lining thickness. With the ground resistance simulated as the spring, the radial load test of the tunnel secondary lining model was carried out, which was reinforced by the new cover arch separated with the original lining by additional waterproof broad, and the deformation law and failure mode of cracked lining after reinforced by separated cover arch were achieved. The results show that under the action of loosening pressure, the loading process of separated cover arch reinforced structure can be divided into three phases: initial loading-radial penetration of the prefabricated crack-radial penetration of the cover arch crown crack-failure of the specimen; the failure load is governed by the haunch section of original lining, and the overall failure property acts as the brittle failure with a failure sequence of key parts as crown cracking-haunch fracture-crown failure.
YU Wen-Sheng-1,
2 ,
Sang-Yun-Long-3
.Experimental Study of the Deformation Law of Cracked Tunnel Lining Reinforced by Separated Cover Arch[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(4): 141-149
2014, Vol. 51 