To investigate the effect of dynamic consolidation on bearing capacity and settlement deformation of high-fill gravel soil foundation, the gravel soil filler of a high-fill roadbed in Chongqing is taken as the main research object. According to the typical gradation of the site, apply a scale reduction to the filler size. the optimal soil-rock ratio of gravel soil material was determined by compaction test. Through the field dynamic consolidation test, the settling volume of gravel soil foundation and blow count of dynamic sounding under three different soil-rock ratios (4 : 6; 3 : 7; 6 : 4)were studied, and the influence of the soil-rock ratio on the reinforcement effect of dynamic consolidation was discussed. The test results show that the soil-rock ratio is the key factor affecting the compaction quality of the filler and the compaction effect of the soil-rock ratio of 4 : 6 is the best; Under the application of tamping energy of 3000 kN·m, the optimal tamping times of different soil-rock ratios are 7~8, the cumulative tamping settlement of soil-rock ratio 4 : 6 is the largest and the discrete degree of tamping settlement is large; After dynamic compaction, the average blow count of dynamic sounding of gravel soil foundation in the depth of 2~4 m is significantly increased, and the effective reinforcement depth of soil-rock ratio 4 : 6 is the largest; After tamping, the increased range of reinforcement effect under different soil-rock ratios is in the order of soil-stone ratio (4 : 6)> soil-stone ratio (3 : 7)> soil-stone ratio (6 : 4).

The high-pressure equation of state is the basis of studying the failure mechanism of materials and the propagation law of shock waves under explosion or impact loading. The state of rock has a wide range of applications in the numerical calculation of mining, meteorite impact cratering, rock impact protection, etc. Using a two-stage light gas gun and Photon Doppler Velocimeter(PDV), the Hugoniot relationship, high-pressure equation of state and volume strain equation of red sandstone were studied. The lowest and the highest impact pressure generated by the collision were 7.2 GPa and 19.4 GPa, respectively, and the lowest and the highest planar impact velocity were 0.88 km/s and 1.97 km/s, respectively. At the same time, optic probes were used to measure the shock wave velocity of rock samples. However, The Hugoniot-Elastic-Limit(HEL) point of the red sandstone was not found in the free surface velocity profile recorded by the PDV, indicating that the red sandstone was in a near-fluid state within this impact pressure range. Furthermore, the shock wave velocity D and particle velocity u were linearly fit by the least square method, and the Hugoniot parameters of the red sandstone were C₀=3.04 and λ=1.14, respectively. In addition, the relationship between the volumetric strain η and the impact pressure P were obtained by polynomial fitting, which was P=116η-745η²+1845η³, and the nonlinear fitting coefficient was 0.993. The Hugoniot equation of state and bulk strain equation of red sandstone obtained in this work can provide reference data for numerical calculation and engineering application in red sandstone rock blasting, shock protection engineering, and so on.