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Content available Load transfer law and bearing capacity of the anchorage interface based on a three-stage model
Li Longfei, Wang Xuebin, Zhao Tongbin, Xing Minglu, Guo Weiyao, Zhang Yubao
Journal of Theoretical and Applied Mechanics
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2025
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Vol. 63 nr 1
151--164
EN
The shear stress constitutive equation of an anchorage interface element is established based on a three-stage model, and the expressions for the interface shear stress and axial force distribution evolution during the whole process of anchor drawing are derived theoretically. The parameters of the interface model are given through anchor pull-out tests. Then, the load transfer law and the bearing performance of the anchorage interface under different anchoring agents are calculated and analyzed. The calculation method of the ultimate bearing capacity of the anchorage interface is verified by supplementary tests, which can provide theoretical guidance for the bolt support design.
2
Content available Coupling effect of hole enlargement and diffusion in the grouting process in a weak stratum based on analytical research
Zhao Zenghui, Meng Zhe, Li Longfei, Li Canlin, Yang Peng
Journal of Theoretical and Applied Mechanics
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2024
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Vol. 62 nr 3
637--649
EN
According to the tail grouting of a double shield TBM tunnel in a soft stratum, the spherical hole model with small and large diffusion radius were established respectively considering the slurry diffusion and slurry displacement effect in the grouting compaction stage. An- alytical solutions of the spherical hole expansion stress and displacement field under the hole expansion-diffusion coupling effect are deduced. The interaction among plastic zone radius, reaming radius, initial radius of the spherical hole, and the seepage radius were analyzed. The results show that the larger the seepage pressure of grouting, the smaller the plastic radius. The larger the reaming radius is, the larger the plastic zone radius is. When the reaming radius reaches a certain value, the plastic radius tends to be stable, and the smaller the grouting seepage pressure, the earlier it tends to be stable. The above conclusions have important guiding significance for optimizing grouting parameters in weak strata.
3
Content available Analysis and calculation of stress intensity factors for type I cracks on the edge of elliptical holes under internal pressure
Chen Shiwei, Xing Minglu, Liu Yaxin, Yin Yanchun, Li Yurong, Li Longfei
Journal of Theoretical and Applied Mechanics
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2024
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Vol. 62 nr 1
157--169
EN
The stress intensity factor and stress field expression for long cracks near an infinite-length plate bore are calculated using the Muskhelishvili Complex Function Approach. It applies to engineered bore edge cracks, especially under the condition in which the elliptical bore is subjected to internal pressure or only the surface of the crack is subjected to internal pressure. The formula is validated by numerical simulation and applies both to elliptical and circular holes. The variation of stress intensity factor with crack length is analyzed when the special round hole is only subjected to internal pressure. It has practical application value in fracture engineering.
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