Study on the Influence of Soil Engineering Geological Characteristics at Key Tectonic Sites on High-Speed Railway Foundation—A Case of the Beijing–Zhangjiakou High-Speed Railway (Huailai Section)

The soil engineering geological characteristics and hidden fault creep activity are the main factors affecting stability of Beijing–Zhangjiakou high-speed railway foundation. In order to reveal deep formation structure physical mechanical properties under foundation explore influence settlement static load dynamic railways, according deep-hole drilling test, this paper reveals within a 500 m buried depth Huailai section railway. Based on data, we constructed 3D model across segments study mechanism trains differential ground settlement. results show that basic parameters all kinds have little change with increase depth, ratio secondary consolidation index Cs compression Cc is 0.0036–0.0516. Under train, vertical displacement gradually decreases which mainly affects 50 depth. Within range, at certain point negatively correlated speed horizontal distance from line fault. research expected provide scientific support for safe operation