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Study on Cavity Stress and Deformation after Grouting to Fill Up the Lining of Existing Hydraulic Tunnels

Author(s)

Shaochuan He1, Meiling Hua2,3,*

Affiliation(s)

1Shaanxi Dongzhuang Water Conservancy Hub Engineering Construction Co., Ltd, Xi’an, Shaanxi, China 2Gansu Building Materials Research & Design Institute Co., Ltd., Lanzhou, Gansu, China 3School of Civil Engineering, Xi’ an Shiyou University, Xi’an, Shaanxi, China *Corresponding Author

Abstract

Hollow hole after lining of hydraulic tunnel is one of the common diseases in water diversion tunnel engineering. Aiming at the stress and deformation of the post-lining cavity of existing hydraulic tunnels after grouting, a method for assessing the stress and deformation of the post-lining cavity of existing hydraulic tunnels after grouting is proposed by taking a specific case of a section of a water diversion tunnel in Shaanxi Province as a concrete example, which aims to accurately assess the influence of grouting on the stress distribution and deformation of the post-lining cavity of tunnels after grouting. Two working conditions are adopted, working condition I and working condition II correspond to 70% and 50% of the total load of surrounding rock + primary support + steel arch sharing, and 30% and 50% of the total load of lining sharing, respectively. ABAQUS general finite element software was used to carry out detailed analysis and research. The results show that after grouting reinforcement, the main tensile stress of Case I lining is 0.4564MPa, and the safety margin is 64% higher than that before grouting. The main tensile stress of the lining in Case 2 is 0.9152MPa, and the safety margin is increased by 27.9% compared with that before grouting, and the results of the two cases meet the requirements of C25 concrete limit. The research results can not only provide solid theoretical support for the tunnel reinforcement project, but also have significant practical significance in engineering.

Keywords

Existing Hydraulic Diversion Tunnel; Hollow; Grouting Reinforcement; Stress

References

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