## 4 Engineering Applications  
Ganzhou City, Jiangxi Province, with a longitudinal distance of 295 km and a horizontal distance of 219 km, has a total area of 39,379.64 square kilometers, accounting for 23.6% of the total area of Jiangxi Province, making it the largest administrative district in the province. In terms of geological composition, Ganzhou City has a wide distribution of granite, and thus a large amount of granite residual soil exists. The liaison line of the highway from Anyuan County to Dingnan County is a highway in Ganzhou city connecting Anyuan County and Dingnan County, and its side slopes consist of typical granite residual soil; a map of the study area is shown in Figure 16. The slope is a half-filled and half-excavated slope with a cross-sectional filling height of 11 m, slope width of 21.5 m and slope gradient of 31-33\({}^{\circ}\); the model is schematically shown in Figure 17 [39]. The slope is used as an example for slope stability analysis.  
Numerical simulation of granite residual soil slopes was carried out using the ABAQUS finite element analysis software version 2022. ABAQUS is a powerful finite element simulation software used in engineering. Geotechnical engineering, involving seepage, flow-solid coupling analysis and other issues, is often a nonlinear problem, and ABAQUS can be used for the analysis of these issues to achieve better results. ABAQUS analyses can couple permeation and deformation problems by treating solid- and liquid-phase systems as an overlapping continuum and ignoring the microscopic shape of the porous medium [40].  
Figure 16: Location of the study area.  
Figure 17: Schematic diagram of actual engineering slope modeling.  
Additionally, ABAQUS has a rich built-in soil instinctive model for high-quality simulation of the soil properties, displacement and stress during soil instability [41]. Therefore, ABAQUS is well-suited to solving geotechnical engineering problems, and results obtained using ABAQUS can be used as a guide for solving physical engineering problems.  
For finite element modeling, the grid cells are turned on in hybridization mode and selected as eight-node quadrilaterals with reduced integral pore fluid cells, i.e., CPE8 RPH cells, for a total of 11,313 cells. The boundary range of the model during finite element calculations will have some influence on the calculation accuracy, and the original slope size must be increased appropriately. Therefore, to ensure computational accuracy, the height of the model is taken to be two times the slope height, and the distance from the slope foot to the border is taken to be 1.5 times the slope height. The simulation mesh division is displayed in Figure 18. The backfill area of the slope model is configured with two sets of material parameters corresponding to plain soil and enhanced soil, based on the actual slope data. The Moore-Cullen primary model is used for both materials and the parameters are displayed in Table 4. The material parameters are derived from the data already measured in the previous chapter with the basic properties of granite residual soils. The following assumptions are made about the material: the material is homogeneous, continuous and isotropic.