To study the detection and evaluation methods for the effectiveness of karst cave grouting treatment, this article conducted on-site drilling core detection and high-density electrical method indoor model test research on the karst grouting treatment section of a certain project. This article first tested and analyzed the grouting effect of the karst cave in the treatment section through drilling and coring, and found that the grouting treatment effect of the karst cave in the section was relatively good; Then, combining digital modeling and 3D printing, the construction of a karst cave model was achieved, providing a reference for indoor karst model experiments; Finally, based on the evaluation method of high-density electrical method for detecting the effectiveness of karst grouting under different slurry filling conditions was deeply studied through indoor model experiments. The results indicate that the apparent resistivity value at the location of the karst cave after grouting will decrease to a certain extent compared to before grouting, and the area of high resistivity anomaly will decrease; As the amount of grouting in the karst cave increases, the time for the apparent resistivity image to reach stability at the grouting site of the karst cave is correspondingly prolonged. Usually, when the karst cave is completely filled with cement slurry, the apparent resistivity image will reach stability 7 days after grouting. This study provides a certain reference for optimizing the detection and evaluation methods of karst grouting effectiveness.

Prefabricated station can effectively improve the quality and efficiency of engineering construction, which is the inevitable trend of high-quality development of urban rail transit. In this paper, a static model test of an assembled metro station is conducted in the context of the first new assembled station of Shenzhen metro with a new C-H-C joint. The finite element model of prefabricated subway station frame is established according to the static model test of prefabricated subway station joint. The nonlinear characteristics of C-H-C joint were described by spring-solid contact, and the nonlinear spring was used to simulate soil-structure interaction, and the finite element analysis model of stratiform-structure nonlinear interaction was established. The static response of the structure under different test conditions was numerically simulated. Test results indicate that the mechanical responses of the physical model and the numerical model were consistent, then, the rationality of numerical model was verified. Compared with the low water level condition, the internal forces and deformation of the bottom slab were significantly amplified in the high-water level condition, and the bottom plate should be designed as beam-columns. The internal forces are mainly transmitted through the joints at the top and bottom corner, and the amplitudes are mainly affected by the contact area.