摘要：An optimal drainage tunnel location determination method for landslide prevention was proposed to solve the existing problems in drainage tunnel construction. Current applications of drainage tunnel systems in China were reviewed and the fimctions of drainage tunnel were categorized as catchment and interception. Numerical simulations were conducted. The results show that both catchment and interception tunnels have variation of the function in the simulation of monolayer model, which shows the reduction of permeability condition in lower layer. The function of catchment can be observed in the deep slope, while the function of interception is observed near groundwater source. By using the slope safety factor and discharge water amount as the objectives of optimal drainage tunnel location, and pore-water pressure in fixed node and section flux as the judgment for construction quality of adjacent drainage tunnel, the design principle of drainage tunnel was introduced. The K103 Landslide was illustrated as an example to determine the optimal drainage tunnel location. The measured drainage tunnel efficiency was evaluated and compared with that from the numerical analyses based on groundwater data. The results validate the present numerical study.

摘要：Given the extensive utilization of cantilever retaining walls in construction and development projects,their optimal design and analysis with proper attention to seismic loads is a typical engineering *** research presents a new algorithm for pseudo-static analysis of retaining walls employing upper bound *** algorithm can be utilized to design and check the external and internal stability of the wall based on the proposed *** of the main features of this algorithm is its ability to determine the critical condition of failure wedges,the minimum safety factor and maximum force acting on the wall,as well as the minimum weight of the wall,simultaneously,by effectively using the multi-objective *** results obtained by the proposed failure mechanisms show that,while using the upper bound limit analysis approach,the active force should be maximized concurrent with optimizing the direction of the plane passing through the back of the *** present study also applies the proposed algorithm to determine the critical direction of the earthquake acceleration *** critical direction of earthquake acceleration coefficient is defined as the direction that maximizes the active force exerted on the wall and minimizes the safety factor for wall *** results obtained in this study are in good agreement with those of similar studies carried out based on the limit equilibrium method and finite element *** critical failure mechanisms were determined via optimization with genetic algorithm.

摘要：In order to achieve the safe mining in Sanshandao Gold Mine,five schemes of secure pillar group are *** the method of the renormalization group,the failure mechanism of the pillar group is explored,and the safety factor of the pillar system is also *** displacement characteristics,stress-strain laws,distribution of plastic zone and damage range of different pillar group are analyzed using numerical calculation software *** determine a reasonable pillar group scheme,the pillar stability and roof deformation are utilized to evaluate the safety of the pillar *** addition,the theory of fuzzy comprehensive evaluation is adopted to verify the optimal *** pillar group with the lowest roof deformation value is chosen as the optimal plan,which renders a factor of safety of 2.06 for the pillar *** to this scheme,pillars with the width of 10 m are set along the strike of undersea deposit with the interval of 50 *** pillars of 15 m in width are set at the location of the exploration line of 127,151 and *** analysis can be used to provide guidance for optimal design of pillar structures in undersea mining.

摘要：At present,the methods of analyzing the stability of slope under earthquake are not accurate and reasonable because of some limitations. Based on the real dynamic tensile-shear failure mechanism of slope,the paper proposes dynamic analysis of strength reduction FEM (finite element method) and takes the reduction of shear strength parameters and tensile strength parameters into consideration. And it comprehensively takes the transfixion of the failure surface,the non-convergence of calculation and mutation of displacement as the criterion of dynamic instability and failure of the slope. The strength reduction factor under limit state is regarded as the dynamic safety factor of the slope under earthquake effect and its advantages are introduced. Finally,the method is applied in the seismic design of anchors supporting and anti-slide pile supporting of the slope. Calculation examples show that the application of dynamic analysis of strength reduction is feasible in the seismic design of slope engineering,which can consider dynamic interaction of supporting structure and rock-soil mass. Owing to its preciseness and great advantages,it is a new method in the seismic design of slope supporting.

摘要：Firstly,the common design principles for diversion tunnel plug are generalized,and two kinds of numerical analysis methods are *** the strength reduction FEM is introduced in numerical model analysis and the design steps of the plug's length are *** the progress to determine the plug's length,the equivalent plastic strain on the potential slip surface is assumed as the flag to tell the failure against sliding,and the plug stability is overall estimated from the plastic zone range and connectivity.