Entity

Time filter

Source Type


Cao X.-M.,Beijing Jiaotong University | Cao X.-M.,China Airport Construction Group Corporation of CAAC | Wang X.-F.,Beijing Jiaotong University
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/ Journal of Transportation Systems Engineering and Information Technology | Year: 2010

Scientific and rational selection of multi-airport site is one of the important decision-making problems which involve a number of factors and different interests groups, and generate coordinated capacity of each airport system and maximum benefits. Based on impact analysis of the departing air travelers airport random choice behavior a bi-level programming model is proposed to describe the multi-objective criteria in the process of location decision in the multi-airport region. The upper level model is to maximize the decision makers benefits and the lower level model describes the travelers airport choice behavior. Thus, benefits of both traffic decision makers and air travelers are considered in the proposed model. The heuristic algorithm is used to solve the model. Finally, an example is used to show the validity and rationality of the proposed model. The results indicate that the multi-criteria decision making method is close to the actual situation, and it has practical significance in the aspect of optimizing airport resource allocation and improving airport competitiveness in multiple airport region. Source


Liu Y.,China Airport Construction Group Corporation of CAAC | Liu Y.,Beihang University | Liu Y.,Beijing Super Creative Technology Co.
Applied Mechanics and Materials | Year: 2013

This article introduces one new measurement technology for evaluation of the early age shrinkage performance of concrete material without constraint conditions. Its exercise of eddy current method could make the airport pavement concrete material tested accurately during concrete early-age from pouring, when the pavement concrete does not harden. It also can evaluate the effects of the influencing factors on the concrete early-age shrinkage, such as fly ash, admixture, and fiber. By this method, the Shrinkage performance of different concrete material can be evaluated when concrete property design for airport pavement is making. © (2013) Trans Tech Publications, Switzerland. Source


Liu Y.,China Airport Construction Group Corporation of CAAC | Liu Y.,Beihang University
Materials Research Innovations | Year: 2014

This article mainly focuses on structural material anti-cracking property under negative pressure for the tunnel secondary lining of Wu-Guang passenger dedicated line during service period in China and points out that dynamic crack of the tunnel secondary lining is the key influential factor for structural material under negative pressure. In view of that no standard method has been proposed to test and characterise the anti-cracking performance of tunnel secondary lining, a new method for evaluating the cracking performance of tunnel secondary lining in service is presented in this paper. When load level reached 30% of the maximum, anti-air permeability of cellulose fibre concrete was evidently improved by 40% than that of plain concrete. This result shows that novel structural material cellulose fibre concrete can improve the anti-cracking performance of tunnel secondary lining in service. © 2014 W. S. Maney & Son Ltd. Source


Huang M.-S.,Tongji University | Liu H.-Z.,Tongji University | Cao J.,China Airport Construction Group Corporation of CAAC
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

Response displacement method is a kind of simple and practical analysis method for aseismic design of soft soil tunnel, for the method can reflect dynamic reaction behavior of soft soil tunnel under aseismic load. Taking square section tunnel for example, the accuracy of the method has been verified by comparing its predictions with results from a soil-structure whole dynamic finite element method. Based on plane strain assumption, the analytical expression for soil spring stiffness has been deduced from the function of complex variable method in elastic theory for the purpose of simplifying the calculation process of response displacement method. The analytical solution for soil spring stiffness has been verified by comparing its predictions with results from finite element method. The analytical expression for soil spring stiffness has been applied to response displacement method. Meanwhile, simplified calculation models for shear stress and seismic response displacement of free soil field have been adopted. The whole dynamic finite element method has been used to validate the accuracy of simplified response displacement method for transverse secion aseismic analysis of soft soil tunnel. Source


Qin H.-L.,China State Construction Engineering Corporation | Zhang J.-F.,Tongji University | Zhang J.-F.,China Airport Construction Group Corporation of CAAC | Guo Y.-C.,Zhengzhou University | Li F.,China Construction Second Engineering Bureau Ltd
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The physical meanings of the parameters for the porous elasticity model and the critical state plasticity model in ABAQUS, a popular commercial finite element software, are discussed, and the methods to decide the parametric values from triaxial compression tests or oedometer tests are presented. Based on the relationship among the normal consolidation line, unloading-reloading line, K0 consolidation line and the critical state line of e-lnp' curves and the modified Cam-clay model, the correlation between the initial void ratio and the mean effective stress in the field is deduced and used in the simulation by ABAQUS. A soil-nailing case is simulated in ABAQUS by means of the porous elasticity model and the critical state plasticity model. The deformation results of this soil nailing case are analyzed, and the rationality is verified by the monitoring data in practice. Source

Discover hidden collaborations