Accurate geotechnical parameter inversion and timely instability warnings are vital for safe underground engineering. However, privacy constraints typically isolate monitoring data across participants, while geological heterogeneity and limited labeled data hinder the generalization of conventional models. To address these challenges, we propose a collaborative framework integrating federated learning (FL), knowledge graphs (KGs), Temporal Transformers, and meta-learning for parameter inversion and instability prediction. Our method employs a geological-mechanical KG to encode prior structural relationships, while a Temporal Transformer extracts dynamic patterns from multi-source sequences. Furthermore, a meta-learning-based FL strategy enables rapid adaptation under non-IID and few-shot conditions. These inverted parameters are subsequently fused with monitoring responses for downstream instability forecasting. Experiments on tunnel monitoring and synthetic slope datasets demonstrate superior performance over representative baselines. Notably, our framework reduces inversion RMSE by 19.2
In this paper, the effectiveness of post grouting at the end of prestressed high strength concrete (PHC) pipe pile is evaluated by paired full-scale static load test in an industrial site in Qingyuan. For each pile diameter (Ф400 mm and Ф500 mm), one ungrouted pile and one post-grouted pile were tested under comparable conditions. The results show that the post-grouting increases the ultimate bearing capacity of the two pile diameters by about 30
By establishing a full dynamic time history numerical model, the dynamic responses of arched all-column-free subway station structures with or without diaphragm walls under earthquake of different intensity are analyzed. The analysis mainly focuses on the deformation mode of the station structure, structural damage and strain of reinforcement in key structural elements. A stress-dependent small strain elastoplastic dynamic constitutive model is used to simulate soft soil layer, and the concrete plastic damage model and ideal elastoplastic model are used to simulate structural concrete and reinforcement, respectively. The analysis results show that no matter with or without diaphragm walls, the column-free large-span station structures would exhibit a coupled racking-rocking deformation mode during earthquake. However, the diaphragm walls reduce the global rotation of the structure. The most vulnerable parts of the structure are the joint of side wall and bottom plate, as well as the end of middle plate. However, under the same earthquake action, the damage of station structure with diaphragm wall is less than that of the one without diaphragm wall. During the earthquake, reinforcement strains at the middle plate support and the bottom of the side wall accumulated to a certain degree compared to the static strains, but it won’t exceed the elastic region during SHB-0.2g.
This study focuses on rock slopes with weak interlayers widely distributed in mountainous regions of southwestern China, using near- and far-field ground motion records from the 1999 Chi-Chi earthquake as input loads. After analyzing the ground motion features, numerical simulations are performed to explore the dynamic response characteristics and differences (including acceleration amplification, displacement and plastic zone) of such slopes under the two seismic conditions. The results reveal that: (1) Distinct differences exist in frequency components and response spectra between near- and far-field ground motions. Near-field motion has a higher predominant frequency with spectrum decaying after the short-period peak, while far-field motion is rich in low-frequency components and has higher overall spectrum values. (2) Near-field ground motion produces a more significant horizontal acceleration amplification effect, especially in the middle and upper parts of the slope. (3) Slope displacement mainly occurs above the weak interlayer and at the slope surface junction. Far-field ground motion induces larger permanent displacement, shear strain increment and wider plastic zone. The potential instability is shear sliding along weak interlayers, indicating that reinforcing the weak layer at the slope foot is crucial for slope prevention. The conclusions can provide references for seismic stability analysis and disaster control of similar rock slopes.
Landslides of expansive-soil along canals have continued to be a challenge due to the geotechnical engineering practices since expansive-soils are very sensitive to the alternation of moisture, gradual, and long-run stability problems. This paper gives a comprehensive geologic mapping of a huge expansive-soil slump that took place around the Taocha canal head in central China after months of precipitation. The mechanism of the formation of landslides was clarified with the assistance of field surveys, trenching, laboratory testing and data monitoring. An extensive reinforcement was done including slope unloading, anti-slide piles, staged excavation, systematic drainage, and soil surface protection modified by cement. The long-term effectiveness and durability of the existing implemented solutions have been confirmed during more than ten years of monitoring after construction. These findings provide practical guidelines to massive engineered slopes in the slope of canals and other engineered slopes.
