STABILITY ANALYSIS OF SLOPE SUPPORTED BY PRESTRESSED ANCHOR PILE SLAB BASED ON FLAC3D

Stability problems in high fill slope projects in mountainous and hilly areas have become a key challenge affecting project safety.The article is devoted to discussing the existing research results on the determination of potential slip surface, stability analysis, optimization of support structure parameters, and numerical simulation analysis of high-fill slopes in mountainous and hilly areas.In the article, a FLAC3D three-dimensional numerical model of a typical high-fill slope was established, which revealed the spatial distribution characteristics of potential landslide fracture surfaces of multilevel slopes, and the results showed that multilevel slopes often had more than one potential landslide fracture surface, which needed to be "graded management" in the actual project; A twoparameter orthogonal test was designed and implemented to comparatively analyze the interaction mechanism between the pile-slab-prestressed anchor cable composite support structure and soil, and reveals the sensitivity of the anchoring depth of the pile and prestressing stress of the anchor cable in the prestressed anchor cable-pile-retaining plate support structure to the slope safety coefficient, and the calculation results show that increasing the embedment depth of the pile and increasing the prestressing stress of the anchor cable can improve the slope safety coefficient; The article also reveals that there are critical values of pile embedment depth and anchor cable prestress, beyond which the contribution of increasing the embedment depth or anchor cable prestress to improving the slope safety coefficient will decrease, and further determines the optimal values of pile embedment depth and anchor cable prestress for this typical slope project.The results and ideas in the paper provide technical references for the design and construction of similar projects, as well as methods and ideas for scientific colleagues to further carry out numerical simulations of related projects.