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| Calculation method of combined load-sharing ratio of deep-buried pressure pipelines |
| YUAN Mingdao, LIU Yijie*, HUANG Bensheng, YANG Fengjie, ZHANG Xuhui
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| Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, Guangdong, China |
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Abstract To calculate the load-sharing ratio of surrounding rock in deeply buried pressure pipelines under internal water pressure, a computational model was established based on the power series solution method of complex variable functions. This model considered the interactions among the steel lining, concrete lining, and surrounding rock, as well as the influence of gaps. By solving the potential function for each supporting component, the stress and deformation at any point within their domains, along with the load-sharing ratio of the surrounding rock, could be determined. Subsequently, the effects of internal water pressure magnitude, gap size, and surrounding rock type on the load-sharing ratio were investigated. The calculation results agreed well with numerical simulations. The results indicated that: The pipeline expansion caused by internal water pressure decreased with increasing distance from the pipe; The load-sharing ratio of the surrounding rock was influenced to varying degrees by the internal water pressure, gap size, and surrounding rock type, with gap size being the most sensitive factor—even millimeter-scale gaps significantly reduced the ratio; The load-sharing proportion during combined bearing was determined by the stiffness of each supporting component.
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Published: 29 December 2025
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