Gao M.,Shandong University of Science and Technology |
Gao M.,Shandong Province Key Laboratory of Civil Engineering and Disaster Prevention and Mitigation |
Gao G.-Y.,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education |
Gao G.-Y.,Tongji University |
And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011
Considering the effects of coupling mass, the transient dynamic response of a cylindrical lining structure subjected to sudden internal uniform loading is studied. Based on the Biot's dynamic theory, the lining structure and saturated soils are respectively treated as the fluid-solid coupling medium and the homogeneous elastic one. A solution to the dynamic response of the lining structure in saturated soils is obtained by means of the Laplace transform and the method of the separation of variables. By utilizing the inner boundary condition of the lining structure and the continuity conditions between the soil and the lining, the unknown coefficients in the expressions are determined. By use of the numerical integration of inverse Laplace transforms, the numerical solution to the problem is presented. On this basis, the dynamic responses of the lining structure in saturated soils are analyzed for different parameters of the soil and the lining. The effects of the coupling mass on the dynamic response of the lining structure are also discussed.
Chen Z.,Tongji University |
Chen Z.,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education |
Fan H.,Tongji University |
Bian G.,Tongji University
Advanced Steel Construction | Year: 2015
To explore the hysteretic behaviors of shear panel dampers under axial compression, numerical analyses were carried out using the general-purpose finite element software ABAQUS. Two important parameters, namely the axial compression ratio and the web slenderness parameter, were selected as governing parameters. To trace the material nonlinearity, a modified two-surface model was adopted to simulate the constitutive relations of the steel material under cyclic shear loading. Discussions focused on the hysteretic behavior, maximum shear strength, and energy dissipation performance concerning the axial compression ratio. It was found that axial compression deteriorates the hysteretic behavior and energy dissipation performance of shear panel dampers. In addition, under high axial compression, a small web slenderness parameter leads to unexpected brittle failure. © 2015, Hong Kong Institute of Steel Construction. All Rights Reservseed.
Yin Z.-Y.,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education |
Huang H.-W.,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education |
Hicher P.-Y.,CNRS Research Institute in Civil Engineering and Mechanics
Soils and Foundations | Year: 2016
Experimental observations have shown that the mechanical behavior of sand-silt mixtures is highly dependent on the proportions of sand and silt. Our present paper proposes a simple elastoplastic model for the stress-strain behavior of sand-silt mixtures. The inter-grain contact index is firstly reviewed. A formulation which links the inter-grain contact index with the void ratio is then proposed and validated by measuring the index void ratios of various sand-silt mixtures. The formulation is applied to determine the position of the critical state line of sand-silt mixtures from sand to silt. Based on this formulation, a simple elastoplastic model is then developed. The model parameters can be easily determined from conventional triaxial tests and measurements of the index void ratios. The predictive capability of the model was examined by comparing the simulations and the experimental results of undrained triaxial tests on Foundry and Ottawa sand-silt mixtures from sand to silt. © 2016 Japanese Geotechnical Society.
Wang M.,Tongji University |
Wang M.,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education |
Li J.-P.,Tongji University |
Li J.-P.,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013
Based on the limit equilibrium concept, the trajectory axis of an arc-shaped arch is simplified to be linear considering the trajectory of the minor principal stress induced by arching effect. A new method for the active earth pressure is proposed through the improved horizontal elements, in which the differential flat elements are divided along the secant direction of the arc-shaped arch trajectory axis of the minor principal stress. Considering a translational rigid retaining wall and cohesionless soil, the theoretical formulas are obtained for the active earth pressure, the resultant earth pressure and the points of applying the resultant earth pressure. In addition, the internal frictional angle of soil, wall-soil frictional angle and angles of sliding plane and horizontal direction, which affect the unit earth pressure, the resultant force of earth pressure and the application point of the resultant force, are investigated. Finally, the proposed formulas produce satisfactory results through comparisons with the experimental observations and other theories.
Zhang Q.,Tongji University |
Shen M.,Tongji University |
Shen M.,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education |
Zhi W.,Changchun University
Journal of Materials in Civil Engineering | Year: 2011
This study reported an investigation on mechanical behavior of off-white marbles that were selected from a slope and underground cavern. The marble samples with weak structural planes were tested through the multistage loading shear rheological method. The results were used to evaluate the creep behavior of the weak structural planes. It was demonstrated from the obtained creep properties and creep rate characteristics of such structural planes under different normal stress conditions that the green schist weak structural planes showed obvious characteristics of brittle failure, and the shear-creep test curve of the structural plane exhibited three obvious stages. Established on the improved Burger model, a further discussion on the shear-creep mechanism was presented. © 2011 American Society of Civil Engineers.