The anti-seepage wall of a high core dam foundation on thick overburden is rigidly connected with the gravelly-soil core wall by setting a built-in corridor at the top, and the corridor has been damaged and cracked after water storage operation. Based on the “Nanshui” double yield surface model and the Goodman zero-thickness contact element, a quasi-three-dimensional finite element model was established, and the static structural characteristics of the core dam and its built-in corridor were studied by considering the actual dam filling and reservoir storage process. The rationality of the model parameters and calculation results can be verified by the comparison of the calculated and monitored deformation values of the dam. The results indicate that due to the support of the bottom cut-off wall, the built-in corridor presents structural characteristics including uneven deformation, local separation and compression stress concentration; In addition, according to the normal stress of the contact element, the fitting formula of the surrounding pressure distribution of the corridor in the whole process of construction and water storage was summarized. By comparing with the traditional surrounding pressure analysis methods and specifications, it is illustrated that the surrounding pressure calculation method based on the collapse arch theory is not suitable for the stress analysis of built-in corridor with similar structures. Thus, an improved flexible connection structure was proposed to improve the stress state of the corridor and ensure the safe operation of the project. The above conclusions have reference significance for the structural design and safety analysis of similar projects.
Yu Jia'ao
,
Shen Zhenzhong
,
Sun Yiqing
. Research on the Mechanical Characteristics and Structural Improvement for the Built-in Corridor of High Core Dam[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 823
-832
.
DOI: 10.20174/j.JUSE.2025.S2.35
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