This study presents the design and performance assessment of suction anchor foundations for an integrated offshore wind–solar–aquaculture system located in Jiangsu Sheyang, China. The project represents one of the first practical demonstrations of coupling renewable energy production with large-scale marine aquaculture on a shared floating platform. Using three-dimensional numerical simulations in FLAC3D and ABAQUS, the study evaluates the anchors’ bearing capacity, structural safety, and fatigue performance under ultimate (ULS), accidental (ALS), and fatigue (FLS) limit states. The analysis incorporates site-specific geotechnical conditions, seabed scour, and installation deviations, providing a realistic framework for foundation design in layered coastal sediments. Results confirm that the suction anchor system meets international safety requirements (DNV, CCS) and maintains robust performance throughout its service life. The findings demonstrate that scour depth and installation accuracy are critical factors governing anchor reliability and offer practical insights for updating offshore foundation design standards in future multifunctional renewable–aquaculture developments.

This research presents an in-depth analysis of the stability of the surrounding rock of the underground powerhouse at the Yongxin Pumped Storage Power Station in Jiangxi. The study encompasses the rationality of the cavern layout spacing, the impact of excavation construction on surrounding rock stability, stability analysis of the surrounding rock under unsupported conditions, and stability analysis under-supported conditions. Using numerical simulations and on-site monitoring data, the deformation characteristics, stress distribution, plastic zone development, and the effectiveness of support measures during the excavation process of the underground cavern group were evaluated. Key data include the average deformation of the main powerhouse crown ranging from 11-41 mm, the sidewalls ranging from 30-88 mm, and the main transformer cavern crown ranging from 11-30 mm. The results indicate that systematic support measures can effectively reduce surrounding rock deformation, control the development of plastic zones, and alleviate stress concentrations, thereby enhancing the stability of the surrounding rock.

A stable slope is a crucial factor for water reservoir in a hydropower station regarding power generation. This paper mainly uses FLAC 3D to analyze the slope stability and excavation with reinforcement support of stilling basin on the left bank of Kala Hydropower station regarding different operation cases. The numerical analysis reveals that the slope stability meets the design specification of class A and II slopes, while the potential instability area is mainly located in fragmented structural rock mass and class IV rock mass. After the excavation and reinforcement, the stability of the slope is improved to a certain extent, and Sericitolited Sand Slate is located at the foot of the slope, which basically has no effect on the slope stability. The slope unloading and toppling deformation of the left bank regarding the engineering area is obvious, and the shallow surface rock mass is prone to relaxation and damage during the slope excavation process. Therefore, it is recommended that the support should be on time, and according to the geological situation revealed, appropriate reinforcement treatment can be taken to ensure the safety and stability of the construction period. Sericitolited Sand Slate has a certain range of exposure during the excavation process, resulting in slightly higher slope deformation, so it should be carefully excavated. The slate is easy to soften when exposed to water, so attention should be paid to the timeliness and effectiveness of drainage measures during the construction period to avoid local collapse damage caused by softening of rock mass.

This academic study conducts a comprehensive stability evaluation of the structurally critical intake diversion tunnel system at the Jinshuitan Pumped Storage Power Station facility utilizing advanced three-dimensional numerical modeling techniques. The geometrically intricate tunnel network, consisting of interconnected intake tunnels, diversion branch tunnels, and intersecting geological fault features, necessitates a rigorous stability assessment to ensure the structural integrity of the underground infrastructure is maintained during both the construction stage and long-term operational life cycle. Three-dimensional numerical models were developed employing the FLAC3D software to accurately simulate the complex tunnel geometries, multi-stage excavation sequences, in-situ stress state, and mechanical behavior of the surrounding rock mass. Scenarios evaluated included unsupported excavation conditions, an optimized layered and segmented excavation methodology, as well as the implementation of a systematic regime of ground support measures. The modeling results quantified the efficacy of the proposed layered excavation approach in reducing magnitude of tunnel displacements by 0.1-0.5 mm relative to conventional full-face excavation practices. Furthermore, the anchor support system provided a supplemental displacement control of 0.1-0.8 mm. Comprehensive stress analyses validated the effectiveness of the stabilization strategies, with maximum anchor stresses remaining within allowable limits despite localized stress concentrations at critical junctures such as tunnel intersections and fault zones. This integrated stability analysis approach optimizes the design of complex underground energy infrastructure while ensuring long-term structural integrity and operational reliability.