Applied Mechanics and Materials Vols. 501-504

Abstract: Based on a large number of research results of displacement angle in domestic and foreign caving mines, rough set neural network algorithm which is used for calculating the displacement angle of stratum is established by rough set theory and improved BP neural network theory, and which is applied in predicting displacement angle of stratum of a copper mine, The results show that the algorithm has higher precision , and the result is better than the traditional BP neural network algorithm, and providing a new method to similar mine in selecting angle of strata movement.

Abstract: An analysis on safety factor of slope through c - φ reduction algorithm by finite elements method is presented. When the system reaches instability, the numerical non-convergence occurs simultaneously. The safety factor is then obtained by c φ reduction algorithm. This paper, which combines with the actual situation of Jinduicheng open pit mine, analysis the stability of the limit height of the dump based on strength reduction of finite element method. And the value of slope safety factor is 1.25 to 1.30. The results show that calculating safety factors of the slope by ANSYS is in full conformity with the basic requirement of safety. That means, the dump is stable, which can reduce the production costs and benefit the enterprise.

Abstract: The excavations engineering, which is a traditional topic, has an epoch-marking characteristics in geotechnical engineering. With the process of urbanization, the excavations engineering is confronted with new problems. Firstly, the retaining and protection structure (RPS) which is common at present is introduced. Then, their applicable conditions and advantages and disadvantages are discussed, which can provide basis for selecting the RPS in excavations engineering. On this basis, some important problems which exist in the supporting technology are analyzed, and the developing trend is prospected for the supporting technology in excavations engineering.

Abstract: 2D-FLAC was applied to analyze the excavation process and the state of reinforcement structure, the stress statethe displacements Contour Graphthe displacement vector mapthe final settlement and the stress condition of the reinforcement structure were concluded through numerical simulation in the different conditions which the foundation pit was supported and not supported. The calculating results showed that the design of pit supporting structure was reasonable.

Abstract: Taking BaiYu county Ouqu river basin landslide control in Ganzi state of Sichuan province as an example, study the whole design process of lattice frame anchor structure. Firstly, according to the geological conditions and technical code for design, safety criterion for landslide control is confirmed. Secondly, by making use of the features of lattice frame anchor structure this can protect slope and retain stability of landslide together with its small space between beams and light anchor. Finally, the advice and request for construction is specific ally put forward.

Abstract: The consolidation test was performed to samples of fresh soft dredger fill with heights of 2cm, 3cm and 4cm with full-automatic pneumatic consolidometer. The results show that: the soil sample deforms greatly during the consolidation with significant decrease in water content and small consolidation coefficient. The sample height has negligible effect on the deformation rate, compression modulus, compressibility coefficient, etc., while it is closely related to the consolidation coefficient with an inverse relationship.

Abstract: In the paper, according to the definition of the effective length and criterion of the effective length of the single pile, using the numerical method to simulate the foundation of drilling hole perfusion of single pile under vertical load pile settlement and deformation of pile body, based on the way of combining the ultimate bearing capacity and settlement control of pile top, the pile efficiency coefficient of the effective pile length is determined in certain conditions, and also the effective length of single pile. Then, the more reasonable theoretical basis is provided for engineering design and construction.

Abstract: For small and medium sized water conservancy project, gravity dam on soil foundation is a comparatively economic and reasonable dam structure. Based on project case, the author discusses in this paper the seepage-proofing and anti-sliding stability of the gravity dam on soil foundation, focusing on calculation of anti-sliding stability of deep stratum, selection of soil pressure and effective measures for improving the anti-sliding stability of the gravity dam on soil foundation.

Abstract: Based on unsaturated soil seepage and shear strength theory , to explore the pore pressure dissipation law , it has been analyzed seepage about slope of deep foundation pit in Xian , supporting by pile-anchor retaining structure under the condition of continuous rainy by MIDAS software . The simulation result shows a temporary saturated region would appear on the surface of slope in continuous rainy days , then soil water content increasing as the rainwater infiltrate into a deeper soil layer gradually .For the sake of different cohesion of different time , Combine moisture filed , coming from pore pressure field , with the functional relationship between water content and cohesion , of simulated with filed test dates .The influence law of continuous rainy is derived from stability analysis by strength reduction fem about slope safety factor and stress of retaining structure .

Abstract: Monitoring is playing an important role on the building under construction (especially in deep foundation construction phase). By professional, scientific and timely monitoring, reliable monitoring data and information on security incidents that may occur can be provided timely. In this paper, Guang'anmen Hospital outpatient building foundation pit project was analyzed. The horizontal displacement at the top of supporting structure and settlement of the surrounding buildings were discussed. The results show that the horizontal displacement and the impact on surrounding buildings is within a permissible range, which entailed the safety of the foundation pit.