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| Calculation method of combined bearing 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 Aiming at the calculation problem of the combined bearing proportion of the internal hydraulic pressure during the operation of deeply buried pressure pipelines, based on the power series solution method of complex variable function, by considering the interaction relationship among the steel lining, filling concrete and surrounding rock and the influence of the gap, a calculation model for the transmission and distribution of the internal hydraulic pressure was established. The stress and deformation at any position within the domain of each support and the sharing rate of the surrounding rock can be determined by solving the potential function corresponding to each support. Subsequently, the influences of the magnitude of the internal hydraulic pressure, the size of the gap and the type of the surrounding rock on the bearing sharing rate were studied, and the calculation results were all consistent with the numerical simulation results. The analysis results indicated the following: The expansion of the pressure pipeline due to internal hydraulic pressure exhibited a decreasing influence as distance increased from the pipe; Internal hydraulic pressure, gap size, and surrounding rock type all influenced the load-sharing ratio of the surrounding rock to varying extents. Among these factors, gap size was the most sensitive, with even millimeter-level gaps leading to a significant reduction in the load-sharing ratio of the surrounding rock; The stiffness of each load-bearing component determined the load-sharing proportion during combined load-bearing.
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Received: 09 June 2025
Published: 10 December 2025
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