Applied Mechanics and Materials Vol. 777

Abstract: The stability of slope in open-pit affects the economic benefits and safety production of mining enterprises. From the two aspects of internal factors and external factors, this paper analyses the factors affecting the slope stability of open-pit, discusses the basic theory of slope stability analysis, and puts forward the criterion of slope stability based on the safety coefficient. The limit equilibrium method is chosen to analyze the stability of the high and steep slope of open-pit in this paper, and the SLIDE software is used for numerical simulation according to the actual slope model of certain open-pit. The simulation results show that the slope safety coefficient of the instance is 1.01, which is unstable slope. When the number of the slope blocks is more than 40, the safety coefficient tend to be stable. Blasting vibration has a great influence on slope stability. The results of slope stability analysis provide a scientific guidance for the prevention and control of the slope instability.

Abstract: Analysis model for stability of post-earthquake embankment (filled-subgrade) with cracks was established to determine the impact significance of influencing factors. Influence law of subgrade stability was studied which focused on characteristics of cracks conditions. The results showed that the safety factor reduced with increase of crack depth, i.e. subgrade stability worsening with crack reach downwards.

Abstract: With the rapid development of transportation, the vulnerability of bridge under blast loading has more and more attracted people's attention. To ensure the safety of the bridge under the impact of blast loading is very important. This article describes the current situation of bridge structure antiknock research in China and other countries. What’s more, pointed out the shortcomings of existing research and presented that the antiknock research of bridge structure should combine numerical simulation with model test at the same time. This article researches the stress, strain and bridge damage rule of 1: 5 model of T-beam Bridge under explosion effect of small doses explosive.

Abstract: In the performance- based seismic design, seismic performance of building is differently evaluated according to variant seismic conditions. Most of the application programs for structural design (ETABS, SAP, MIDAS, ANSYS etc.) calculate the performance points of building according to Federal Emergency Management Agency（FEMA）, Applied Technology Council -40 (ATC -40)’s seismic building code and parameters. On this paper, we evaluated the seismic performance of building according to our national seismic building code[1] and parameters and maked suggesti- -ons on the design practice.

Abstract: Based on bearing capacity and settlement control design methods for composite foundation improved by combined piles,as well as the system reliability analysis theory,the system of reliability analysis for composite foundation can be divided into three sub-systems;that are bearing capacity sub-system,settlement sub-system and differential settlement sub-system.The system probability of failure for composite foundation call be obtained by calculating that of three sub-systems respectively.It provides a method of system reliability analysis for composite foundations improved by combined piles.

Abstract: More and more construction of tunnel engineering in karst region. Karst influence on tunnel engineering in deformation and instability, it often leading to Partial collapse, impellers, rock fall in the tunnel excavation or after work. For through large Karst cave tunnel, it will give great harm to tunnel, adjacent structures and injuries and consequence is very serious when faced with karst collapse occurs. The paper is based on engineering example of XieGiadong cave tunnel, the research results has important value for engineering construction and protection of resources. For example, the tunnel lining structure under the action of impact load produced large deformation and the overall shear failure and the process is ephemeral. Tunnel in the process of impact contact to destroy only less than 0.1 S, The vertical displacement of 2.88 m, the horizontal displacement of 0.8 m, fall since the collapse of rock mass to the maximum contact force of the contact with the tunnel 7000000KN.

Abstract: According to the requirement of vacuum leak detection container for small satellite, a set of vacuum leak detection container is developed. This paper discuss the design of model and the finite element analysis of different models. Through calculating the variation of the displacement X, Y, Z and the stress distribution of different parts and the rotation Z of the door flange and casing flange, determining whether the deflection of flange under internal vacuum will cause the sealing ring the fall of the sealing effect.

Abstract: The force affect factors of anchor anti-slide pile in slope reinforcement under seismic load are studied in this paper. First of all, the method of dynamic analysis is introduced in FLAC^3D. At the same time, seismic wave is selected in seismic dynamic analysis. Then, the sensitivity influence of anti-slide pile design parameters on dynamic contact stress, shear force and dynamic bending moment is analyzed by applying the seismic wave, giving the most significant effect factors of the dynamic contact stress and dynamic moment. In the end, the distribution regular of the contact force and the pile body stress under earthquake action is analyzed by selecting a case, laying a theoretical foundation for the further study of the dynamic performance of the reinforced slope.

Abstract: Modern timber buildings are more and more popular with their characteristics of green, environmental protection, low carbon. According to their structure, they are divided into light wood frame construction, sawn and log timber structures, glued laminated timber structures, log cabins. This paper analyzes the structure supporting structural system of log cabins, from material requirements, structural design to production process, supplemented by practical case to demonstration, to explore the design method of log cabin’s structure supporting system.

Abstract: The soil surrounding of the pile will be compacted during static sinking-pile, higher pore water pressure will arise, which will cause compaction effect and affect the surrounding engineering environment in the soft soil area. In order to explore the new approach for alleviating the disadvantage effect of static sinking-pile effect, the pipe-pile with hole technique, tapered pipe-pile with hole technique and tapered-poled pipe-pile with hole technique have been put forward on the base of analyzing the static sinking-pile phenomena, the character of the tapered pipe-pile with hole has been analyzed, which differs from the poled pipe-pile with hole. The pipe-pile with hole technique is beneficial to perfect the method of soft soil disposal, the new notion has been afforded for alleviating the disadvantage of static piling effect.