Applied Mechanics and Materials Vols. 71-78

Abstract: Nowadays, Underground space exploitation is one of the directions of the main focus in the construction of Hangzhou. This paper comprehensively introduces the schematic design of the underground space exploitation of Hangzhou east station, combined with the underground space development project of the core area in Hangzhou eastern new city zone. Firstly, the background of the surrounding area is discussed to illuminate the important status of the core area of eastern new city zone in Hangzhou’s future construction. Then, the holistic design concept and construction goal of the underground space exploitation of the core area are presented, and its functions and layout are clarified focusing on the railway construction and circumjacent exploitation project of Hangzhou east station. Lastly, the executive plan about the underground space exploitation of the core area of Hangzhou eastern new city zone is expatiated comprehensively.

Abstract: In this paper, pressure time history on curtain wall of high-rise building are sampled through synchronous multi-spots pressure measurement test in wind tunnel. Peak pressures are calculated by using the method mentioned in this paper for design of curtain wall. Some results and conclusion are useful for design of curtain wall on high-rise building.

Abstract: A new method of removing rotenone from contaminated water using molecularly imprinted polymeric microspheres (MIPMs) is described. The MIPMs were prepared by the emulsifier-free polymerization method. The removal efficiency and selective recognition ability of the MIPMs were studied. The highest removal efficiency was observed at pH = 8. Moreover, the MIPMs can be re-used for at least 10 times without losing any removal efficiency. The MIPMs provided a selective, simple, reliable and practicable solution to remove rotenone from contaminated water.

Abstract: Mining activities would generate large scale goaf, and the existing of goaf makes the mountain body produce great distortion. Therefore, it has become a kind of serious geological hazard. Based on the concrete conditions of Yanchi Mountain, the simulation with ANSYS was conducted for analyzing the stability of goaf, mine pillar and roof, which would find out the high stress zone and plastic zone of the goaf. Therefore, the conclusion that inadequate of the pillar strength is the main cause of the mountain deformation is drawn, and a new strengthening method which is to strengthen the mine pillar and to increase new mine pillars is put forward on basis of the conclusion.The results show that the strengthening method has an obvious effect, and it reduces the workload and the cost, which also provides very significant evidence for the future studying.

Abstract: The current evaluation process of architecture external wall thermal insulation energy-saving has met the problems such as information incompleteness and fuzziness. In order to solve the problems, the fuzzy comprehensive evaluation method is used, and the external wall thermal insulation energy-saving technique evaluation index system is set. And the method is adopt to compare between the walls using and not using the technology. The result shows that the evaluation of the external wall using thermal insulation energy-saving technique is obviously better than the result of the external wall not using the technique, so the thermal insulation energy-saving material should be promoted and applied nation-widely.

Abstract: Analytical model based on the Bernoulli beam theory and fracture mechanics have been developed to predict the fracture toughness of a tri-layered beam with interfacial crack. In this work, a double cantilever beam test is conducted to determine the fracture toughness of mode I. The strain energy release rate for the double cantilever beam is expressed as a function of the material properties and thickness of the tri-layer beam. The analytical solution is validated with the finite element result. Good agreement demonstrates that the proposed approach is able to provide an efficient way for the calculation of the fracture toughness of a multi-layered structure. The effects of material properties and thickness between the adjacent layers of the interfacial crack are examined through a parametric study.

Abstract: The process and thought for the approach bridge of Suiwei bridge design using the method of isolation and energy dissipation were proposed in this paper. The concept of protecting a bridge from the damaging effects of an earthquake by introducing isolating bearings to isolate it from the moving ground is an attractive one. Firstly, the sizes of the laminated rubber bearings and the dia- meters of lead plugs are calculated with static analysis. Then the internal forces of the piers and the damping ratio of the isolated bridge needed to restrict the seismic deformation to 8cm during earth- quakes with seldom intensity were calculated using the Response Spectrum Method, and the result verified with dynamic time history method demonstrates that the Response Spectrum Design Method can restrict the girder displacement to 8cm during large earthquake and reach the goal of 25 percent shock reduction. The design process can be of reference to the bridge design with isolation and energy dissipation.

Abstract: Black strata is a wildly distributed and special rock, whose weathering tends to speed up the weathering and the worsening of all rocks and the construction materials. The paper, via the geochemical process of the sulphide oxidation in the black strata, is to make analysis of the weathering features of the black strata in the west of Hunan province, China; the stability of other minerals in the black strata under acid condition, as well as the effect on the weathering of the black strata by rock components, geologic formation and different movements and moving speeds of the underground water.

Abstract: The mechanical parameters and failure characteristics were obtained based on the results of triaxial unloading tests of limestone. Results show that: The evolution of volumetric strain is determined by lateral strain under unloading condition. Failure modes of rock can be classified into three types. Deformation modulus decreases and Poisson ratio increases in the process of unloading. Mohr-Coulomb criterion can not describe rock unloading failure strength property. Rock burst occur during tunnel excavation are closely related to the rock unloading failure characteristic.

Abstract: Based on reciprocal theorem of work, and the physical geometry equations of finite element, the paper presented a new method to calculate influence surface of inner forces for hexahedral element finite models; it can be used to calculate directly in the solid element finite model. It possesses the characteristics of clarification and simplicity. Compared with the static method and mobile method, it can improve computing precision, and also reduce the amount of the calculation.