###### Abstract  
This paper establishes a numerical analysis model for the slope of a high-inclined angle stratified foundation pit using support methods including row piles, pile-anchor supports, and combined pile-bracing-anchor supports. The reliability of the analysis conclusion was verified by comparing the stress and deformation laws of the support structures on the bedding rock side and the toppling rock side in different schemes, in conjunction with the measured data from Sanhuan South Road Station of Xuzhou Metro Line 3. In addition, on the basis of summarizing the deformation characteristics of the support structures on the bedding rock side and the toppling rock side, the design concept of sectionalized support based on the spatial effect was proposed, and the advantages of the sectionalized support design were elaborated in combination with the numerical analysis results. numerical simulation; rock foundation pit; supporting force; optimal design; sectionalized support control technique +
Footnote †: journal: Applied  
scholars have analyzed the supporting methods of some typical rock foundation pits, such as [PERSON] et al. [5], who compared the support schemes for the power transmission tower near a residential building and considered that pile-anchor support is safer than plate-rib anchor rod support, which has been demonstrated during actual monitoring. [PERSON] et al. [6] suggested that retaining piles should be embedded into bedrock as much as possible to prevent instability of the internal support for the soil-rock composite foundation pit in the Qingdao subway using pile-anchor support. [PERSON] et al. [7] mentioned in her study that the micro steel pipe piles used in moderately weathered and slightly weathered rock stratum with good geological properties, which have little effect on the foundation pit, can be left out and the range of steel pipe piles used was determined. Some scholars have proposed the application range of support methods such as anchor cables [8; 9; 10; 11], anchor shotcretes [12; 13; 14] and soil nailing walls [15; 16] for rock slopes. These methods are not compared in the analysis process for the suitability of the bedding rock side and the toppling rock side of the side slope with bedded rock, while the actual situation is that both sides of the bedded rock slope have their own deformation and failure characteristics [17; 18; 19; 20], and it is difficult to obtain satisfactory support effect by adopting the same support method, which may lead to excessive deformation difference between the two sides. In addition, compared with soil slope, rock slope generally does not suffer from long and wide sliding damage, and its damage scope is usually determined by the position of vertical structural planes on both sides, which is easy to form wedge damage [21; 22]. At the same time, the elastic fulcrum method is generally used for theoretical analysis of deformation of enclosure piles caused by wedge failure. Even scholars have proposed density functional theory (DFT) to calculate deformation behavior of materials [23] or to analyze changes in mechanical properties [24]. However, these methods have not solved the problem of predicting deformation of enclosure piles caused by potential discontinuities. In conclusion, the rock foundation pit is mainly based on the design of soil foundation pit, without considering the particularity of layered rock foundation pit. This paper establishes a numerical analysis model for layered rocks by using support methods including row pile, pile-anchor support and pile-support-anchor combination, analyses the deformation regularity of pile body under traditional row pile support, and verifies the accuracy of the model by combining the measured data of foundation pit of Sanhuan South Road Station.