TY - JOUR
T1 - Structural performance of damaged rigid pipe rehabilitated by centrifugal spray on mortar liner
AU - Zhao, Yahong
AU - Ma, Baosong
AU - Ariaratnam, Samuel T.
AU - Zeng, Cong
AU - Yan, Xuefeng
AU - Wang, Fuzhi
AU - Wang, Tianyu
AU - Zhu, Zihao
AU - He, Chunliang
AU - Shi, Guopeng
AU - Mi, Rongxi
N1 - Funding Information:
Project No. 51979254 was supported by National Natural Science Foundation of China . Financial support was also received by the National Key R&D Program of China “Public security risk prevention and emergency response technology and equipment: Research and demonstration of urban underground utility tunnel safety prevention and control technology” and Zhejiang Provincial Natural Science Foundation of China under Grant No. LGG20E080005 . Chongqing University provided the experimental environment and Professor Liu Xinrong and his research team provided experimental support. The authors thanks them for their assistance.
Funding Information:
Project No. 51979254 was supported by National Natural Science Foundation of China. Financial support was also received by the National Key R&D Program of China ?Public security risk prevention and emergency response technology and equipment: Research and demonstration of urban underground utility tunnel safety prevention and control technology? and Zhejiang Provincial Natural Science Foundation of China under Grant No. LGG20E080005. Chongqing University provided the experimental environment and Professor Liu Xinrong and his research team provided experimental support. The authors thanks them for their assistance.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/10
Y1 - 2021/10
N2 - There has been growing interest in using trenchless technology, especially centrifugal spraying techniques, to renovate the sewer pipe network in China. In this study, a damaged reinforced concrete pipe (RCP) (i.e., 14.7% vertical deformation) with one-meter diameter is rehabilitated by centrifugally spraying on a 50 mm thickness mortar lining. The ultimate (Du) D-load only increased by 2% compared to host pipe's residual strength; however, other pipe properties exhibited improvement. Based on the behavior of two experimental results, finite element models were established, and an innovative pipeline damage quantization model was proposed. Through parameter sensitivity analysis, the effects of interface strength and fracture energy on pipe bearing capacity were studied. It was discovered that interface bonding performance affected the service load of the rehabilitated pipe. From the analysis of pipeline initial state deformation influence on the repaired structure bearing capacity, it was discovered that selecting a reasonable repair time point can effectively improve the functionality of the pipe network and reduce repair costs. An analysis of RCPs structural repair with a vertical deformation larger than 14% revealed that it is difficult to repair damaged pipes only employing mortar spraying. A structural design method based on the service load and ultimate load is presented in this paper.
AB - There has been growing interest in using trenchless technology, especially centrifugal spraying techniques, to renovate the sewer pipe network in China. In this study, a damaged reinforced concrete pipe (RCP) (i.e., 14.7% vertical deformation) with one-meter diameter is rehabilitated by centrifugally spraying on a 50 mm thickness mortar lining. The ultimate (Du) D-load only increased by 2% compared to host pipe's residual strength; however, other pipe properties exhibited improvement. Based on the behavior of two experimental results, finite element models were established, and an innovative pipeline damage quantization model was proposed. Through parameter sensitivity analysis, the effects of interface strength and fracture energy on pipe bearing capacity were studied. It was discovered that interface bonding performance affected the service load of the rehabilitated pipe. From the analysis of pipeline initial state deformation influence on the repaired structure bearing capacity, it was discovered that selecting a reasonable repair time point can effectively improve the functionality of the pipe network and reduce repair costs. An analysis of RCPs structural repair with a vertical deformation larger than 14% revealed that it is difficult to repair damaged pipes only employing mortar spraying. A structural design method based on the service load and ultimate load is presented in this paper.
KW - Finite Element Method
KW - Interface interaction
KW - Rehabilitation
KW - Three Edge Bearing Test
KW - Urban sewer system
UR - http://www.scopus.com/inward/record.url?scp=85112130145&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85112130145&partnerID=8YFLogxK
U2 - 10.1016/j.tust.2021.104117
DO - 10.1016/j.tust.2021.104117
M3 - Article
AN - SCOPUS:85112130145
SN - 0886-7798
VL - 116
JO - Tunnelling and Underground Space Technology
JF - Tunnelling and Underground Space Technology
M1 - 104117
ER -