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| Research on Conversion Formulas of Lateral Wall Pressure for Multi-compartment Cement Silos With Different Materials Based on Direct Shear Tests |
| XU Zengzhao1, WU Lingyu1, LI Ying2, LIU Haiyan2
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| 1 CNBM Equipment Group, Tianjin Cement Industry Design & Research Institute Co., Ltd. , Tianjin 300133, China ; 2 College of Civil Engineering, Henan University of Technology, Zhengzhou Henan 450001, China |
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Abstract To clarify the contact shear performance between stored cement and multi-compartment silos made of different materials, this paper systematically conducted direct shear tests on the contact interfaces between cement and Plexiglas, polypropylene (PP) board, and cement mortar. The test results indicate that the shear stress at the contact interface of each material increases continuously with the increase in shear displacement, and a higher vertical stress corresponds to a higher maximum shear stress value. By fitting the Mohr-Coulomb strength criterion, the internal friction angle of cement was calculated to be 34.2°. The friction coefficients of the contact interfaces between cement and Plexiglas, PP board, and cement mortar were determined to be 0.51, 0.54, and 0.74, respectively. On this basis, by introducing the material friction coefficients and geometric dimension parameters, a conversion formula for lateral wall pressure between a combined Plexiglas-PP board mortar silo and a single-material cement mortar silo was derived. This provides an effective approach for the mutual conversion of lateral wall pressure among silos made of different materials, offering robust theoretical support for conducting lateral wall pressure tests on multi-compartment cement silos and for the practical application of test results in engineering projects.
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Received: 14 September 2025
Published: 25 May 2026
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