Numerous experimental studies reveal that the mechanical and deformational behaviors of sands are dependent on the combined effect of void ratio and stress. To predict this complex behavior of sands, a hypo-elastic mo...Numerous experimental studies reveal that the mechanical and deformational behaviors of sands are dependent on the combined effect of void ratio and stress. To predict this complex behavior of sands, a hypo-elastic model is developed based on the cross-anisotropic elasticity model, which involves four parameters: bulk module, tangent Young's module, volume deformation coefficient and Poisson ratio. A parameter defined as virtual peak deviatoric stress dependent on state parameter is introduced into hyperbolic stress strain relationship to determine tangent Young's module. In addition, an existing fitting equation for isotropic compression curves and an existing dilatancy equation, which can consider the effect of state of sands, are employed to determine bulk module and volume deformation coefficient. Thirteen model constants are involved in the proposed model, the values of which are fixed for a sand over a wide range of initial void ratios and initial confining pressures. Well known experimental data for drained and undrained triaxial compression tests of Toyoura sand are successfully modeled.展开更多
Can the development zone policy that pioneered Chinese industrialization energize the consumption of urban residents and become an important means of achieving the coordinated development of industrialization and urba...Can the development zone policy that pioneered Chinese industrialization energize the consumption of urban residents and become an important means of achieving the coordinated development of industrialization and urbanization?We used the policy impact of upgrading provincial development zones to conduct empirical research on the consumptiondriven effect of development zone policy with the Difference in Difference(DID)model.Our findings show that the upgrading of development zones is significant in raising urban residents’total consumption,personal consumption,housing consumption and expenditure on children’s education.This is mainly due to the increase in productivity brought about by the upgrading policy.However,in cities that have more stringent household registration(hukou)systems,impose tougher home purchase restrictions(HPR)on the floating population and have less social harmony,the labor force is less willing and less able to consume,making it hard to expand domestic demand.展开更多
基金Project(2010BC732101)supported by the National Basic Research Program of China
文摘Numerous experimental studies reveal that the mechanical and deformational behaviors of sands are dependent on the combined effect of void ratio and stress. To predict this complex behavior of sands, a hypo-elastic model is developed based on the cross-anisotropic elasticity model, which involves four parameters: bulk module, tangent Young's module, volume deformation coefficient and Poisson ratio. A parameter defined as virtual peak deviatoric stress dependent on state parameter is introduced into hyperbolic stress strain relationship to determine tangent Young's module. In addition, an existing fitting equation for isotropic compression curves and an existing dilatancy equation, which can consider the effect of state of sands, are employed to determine bulk module and volume deformation coefficient. Thirteen model constants are involved in the proposed model, the values of which are fixed for a sand over a wide range of initial void ratios and initial confining pressures. Well known experimental data for drained and undrained triaxial compression tests of Toyoura sand are successfully modeled.
基金This paper is a phased result of the National Science Fund for Distinguished Young Scholars Project“Urban Development and Management”(71625004)the National Natural Science Foundation of China General Project“Research on the Localization Effect of Reorganizing Districts and Counties on the Basis of Micro-Geographical Data”(71573054).
文摘Can the development zone policy that pioneered Chinese industrialization energize the consumption of urban residents and become an important means of achieving the coordinated development of industrialization and urbanization?We used the policy impact of upgrading provincial development zones to conduct empirical research on the consumptiondriven effect of development zone policy with the Difference in Difference(DID)model.Our findings show that the upgrading of development zones is significant in raising urban residents’total consumption,personal consumption,housing consumption and expenditure on children’s education.This is mainly due to the increase in productivity brought about by the upgrading policy.However,in cities that have more stringent household registration(hukou)systems,impose tougher home purchase restrictions(HPR)on the floating population and have less social harmony,the labor force is less willing and less able to consume,making it hard to expand domestic demand.
