Research On Analysis And Evaluation Of Slope Stability And Anti-slide Piles

In recent years, the slope stability is one of key problems which experts, scholars and engineers mainly focused on in hydropower engineering and traffic engineering. In engineering construction processes, due to the excavation, backfill or disturbance such as boundary conditions changing, which will change the original topography of the slope and the internal conditions of rock (soil) mass, so as to cause stress redistribution,and change the original occurrence environment and balanced state of slope body, as well as, lead to natural disasters such as cracking, collapse and landslides, thus, bring serious damage to people's life and engineering construction. Therefore, in order to explore and solve the problem of slope stability and engineering control measures under complicated environment, the research of the slope stability analysis and evaluation and anti-slide pile in this paper has very significance theoretical and practical value.The high rock slopes of large hydropower projects and deposit slopes in China are choose in this paper. Around the key technical problems such as the slope stability, deformation and anti-slide measures, the following researches are carried out and the corresponding results of the studies are obtained:(1) The analysis and evaluation system of slope stability is built.1) Through data collection, the static and dynamic analysis model of slope stability are summarized systematically, as well as, the anchor jointed rock mass rheological mechanics model is mainly studied based on the elastic viscoelastic potential theory.The local mechanical behavior of joints is studied through the indoor model test, and the deformation parameters of jointed rock are suggested.2) The basic principle and analysis processes of the nonlinear static and dynamic finite element method (FEM) and the rigid body limit equilibrium analysis method (RELM) are summarized.The dynamic analysis module is added to the static analysis procedure CORE3D (Code of Rock Engineering-3Dimension), and the rigid body limit equilibrium analysis program is developed.3)The definition of the slope stability safety factor is discussed deeply from the view of finite element method and the rigid body limit equilibrium analysis method, and the calculation criterion of finite element method of slope stability analysis is discussed, namely the calculation convergence, the plastic zone, displacement mutation mode, the energy criterion, etc, and the displacement mutation criterion is mainly studied.4) The2d and3d combining methods of FEM and RLEM is studied in the slope stability analysis, and the formula of the safety coefficient is derived, as well as,the corresponding analysis program is compiled, and the textual research has carried out.5) The high slope stability data of the domestic large water conservancy and hydropower engineering is collected. Combining with the specification of DL/L5353-2006for slope design in hydropower projects, some new ideas of safety evaluation criteria and the safety factor value suggestions are put forward.(2) Research on bearing force of slide-resistant pile, deformation mechanism and design parameters;1) To onclude the bearing force, deformation mechanism and failure mode of the slide resistance single rank of piles;2) To designe a numerical test model and analyzed the mechanical behavior of slide-resistant pile(single and group piles) by applying FEM in the background of debris slope, which shows deformation characteristics?possible failure mode and discipline of stress transfer of the slide-resistant pile.3) According to the numerical testing results, the estimated diameter of slide-resistant group piles?evaluation parameter? of pile spacing and its adviced value are put forward.4) According to the numerical testing results,3D oil arching effect of the slide-resistant pile is studied, and based on the british standard BS8006, the estimation formula of oil arching effect coefficient is presented.Therefore, above mentioned results can be taken as a theoretical basis for designing scheme of the slide-resistant pile treatment.(3) Research of application for large slope engineeringBy using evaluation method of slope stability analysis established in the thesis, the stability and controlling methods of large slope engineering such as high rock slope of Cala hydropower station, debris slope of SanBanXi hydropower station and east slope of Changjiang River in Fuling are studied.1) The deformation and mechanical property of high rock slope of abutment of the upper dam line of upper damsite (nearly600m) in the process of excavation and support are researched, and the slop stability is evaluated which provids an important reference for dam site selection, optimization design, construction scheme.2) By using the design parameters calculation mode of the slide-resistant pile presented in the thesis, the diameter and spacing of the slide-resistant pile applied in the debris slope of SanBanXi hydropower station and east of changjiang river in Fuling, and the the feasibility of the slide-resistant pile treatment is demonstrated by applying FEM.In general, the stability and slide-resistant piles of SanBanXi slope and Fuling Jiangdong slope have been studied thoroughly. The achievement presented in this paper is effective and reliable by the verification of practice.