Applied Mechanics and Materials Vols. 303-306

Abstract: A modified dispersive-long-wave (mDLW) hierarchy is obtained by introducing new isospectral problems, the resulting integrable couplings are produced by using a new Lie algebra T6.

Abstract: In recent years, asphalt concrete pavement has been widely used in the deck pavement of highway bridge, the maximum temperature usually reaches up to 150°C.Such a high temperature can cause the disadvantageous temperature field in the box girder. Temperature field of paving asphalt is related to some factors. The finite element method is employed to analyse of the effect such as initial temperature of girder, blanking temperature of asphalt, thickness of asphalt. The results can guide design to reduce crack.

Abstract: In view of that the construction period of shield crossing beneath high-speed rail is apt to cause soil deformation and large differential settlement of ballastless track plate and of the long-term implications on the tunnel structure of the train cycle dynamic load in operating period, with the project of shield crossing intercity in Suzhou as example, the paper determines pre-reinforcement method before crossing project, applies numerical simulation to analyze the influence of pre-reinforcement on the tunnel itself and surrounding strata, then derives the rule of pre-reinforcement on reducing soil deformation and tunnel internal force. The research gives that grouting in main and secondary reinforcement area will apparently reduce settlement deformation , jet grouting pile controls surface deformation well and soil pre-reinforcement will reduce a lot of shield tunnel segment internal force caused by high-speed rail operation.

Abstract: The monitoring data suggests that the overall displacement in Guandi underground powerhouse is a little less, 87% of which is less than 30 mm, while the maximum deformation can be reached as big as 65.77mm. Combined with the study on excavated geological data, the bigger displacement part of Guandi underground powerhouse is mainly affected by the dislocation interfaces, the excavation disturbance causes an opening displacement on the rock mass near the dislocation interfaces and a much bigger displacement partially. Due to the structural surface cut rock mass, deformation coordination between the surrounding rock and the structure surface after stress applied, the stress concentration appears nearby, measuring range of bolt stress meter is excessed in large displacement cases.

Abstract: Focusing on the dredging problem in Yellow River irrigation district, the whip-impact sediment dredging technology is put forward in the Xingjiadu Irrigation District. The finite element model of dredging process is built and the flow characteristic and behavior under design condition is studied, which can provide a theoretical basis for the feasibility of the whip-impact sediment dredging technology. Also, it can provide effective measures for the improvement of sediment dredging effects and whip-impact equipments.

Abstract: In view of the complexity of the deeply-buried water diversion tunnel and adopting the advantage of slope strength reduction method, this research takes advantage of strength reduction method to study the stability of diversion tunnel. Based on the instance of Jinping II hydropower, this paper analyzes Yantang Formation III surrounding rocks buried 2500m deep below the ground, adopts the Mohr-Coulomb criterion, takes the cavern displacements or relative displacement as buckling critical criterion, and finally concludes that the safety factor is 1.5 in this instance, not far from 1.2 in the norm. It is thus reasonable to use strength reduction method to study the stability of the deeply-buried water diversion tunnel. The method can get safety factor easily and objectively and can provide scientific basis for evaluating the deeply-buried water diversion tunnel and the design for the supporting structure.

Abstract: For the current study of large-span bridges are mostly in the component level, the real structural system reliability analysis is still relatively small, so based on the theory of dynamic reliability analysis of structure, the overall bridge structure system for the calculation model is established ,then reliability analysis under the multi-dimensional seismic load and the effect of dynamic flutter are performed, the results of sensitivity analysis with different parameters are obtained, so it is useful basis for the bridge design and evaluation.

Abstract: Masonry in-filled reinforcement concrete (R/C) structure is famous for its’ flexible space arrangement, easy construction and high force resistant capacity as well as its’ high ductility. However, in recent destructive earthquakes happened in China, more and more severe damages of masonry in-filled R/C frame structures have been observed due to either unreasonable design or unexpected-high ground motion exceeding the seismic design intensity mostly. In the field investigation for the 2010 Yushu Ms7.1 earthquake of China, 6 masonry in-filled R/C frame buildings, were in-situ tested by using the ambient vibration method. Both of the test results of the natural period for each structure as well as their damage mechanism were described and analyzed simply. The test results provide reference data for nonlinear numerical analysis and retrofitting of earthquake damaged RC frame structures.

Abstract: Soil elastic parameters(E, μ) will change when soil shear strength parameters(c, φ) reduced, so, it is necessary to adjust elastic parameters using strength reduction method for slope stability calculation. The numerical results show that the adjustment of elastic parameters has little effect on stability, but is more obviously on slope displacement. So, it is important to consider elastic adjust when evaluate slope stability based on slope stability.

Abstract: In recent years, more attention had paid to the vibration and noise influence on nearby building caused by passing trains. The metro depot superstructure is directly built above the train garage, the vibration of superstructure is very serious when the trains get into or go out of the garage. In order to investigate the law of vibration influence on metro depot and superstructure, a field measurement has been carried out and a 3D finite element model of building-platform-column is established. The attenuation law and degree of environmental vibration influence is obtained by analyzing the measurement date and calculation results. The results show that the vibration response of superstructure is obvious, the vibration level is related with the running state of train. The vibration response is more serious when trains pull out of the garage than go into garage, because the running speed is faster when trains pull out of garage. The vibration intensity does not monotonically increase or monotonically reduce with the increasing of floor and it tends to change wave upon wave with the increasing of floor.