Due to the loose structure,high porosity and high permeability of soil-rock mixture slope,the slope is unstable and may cause huge economic losses and casualties.The h-type anti-slide pile is regarded as an effective ...Due to the loose structure,high porosity and high permeability of soil-rock mixture slope,the slope is unstable and may cause huge economic losses and casualties.The h-type anti-slide pile is regarded as an effective means to prevent the instability of soilrock mixture slope.In this paper,a centrifuge model test was conducted to investigate the stress distribution of the h-type anti-slide pile and the evolution process of soil arching during the loading.A numerical simulation model was built based on the similar relationship between the centrifuge model and the prototype to investigate the influence factors of the pile spacing,anchored depth,and crossbeam stiffness,and some recommendations were proposed for its application.The results show that the bending moment distribution of the rear pile exhibits Wshaped,while for the front pile,its distribution resembles V-shaped.The soil arching evolution process during loading is gradually dissipated from bottom to top and from far to near.During the loading,the change of bending moment can be divided into three stages,namely,the stabilization stage,the slow growth stage,and the rapid growth stage.In engineering projects,the recommended values of the pile spacing,anchored depth,and crossbeam stiffness are 4.0d,2.0d,and 2.0EI,where d and EI are the diameter and bending stiffness of the h-type anti-slide pile respectively.展开更多
The effect of the bottom slope on abrupt deflected supercritical water flow was experimentally and theoretically studied.Model tests were conducted in a flume of 1.2 m wide and 2.6 m long with sloped bottom at an angl...The effect of the bottom slope on abrupt deflected supercritical water flow was experimentally and theoretically studied.Model tests were conducted in a flume of 1.2 m wide and 2.6 m long with sloped bottom at an angle 35.54o,its length of deflector was 0.2 m and the deflection angles were 15o and 30o.An approximate method for calculatjng the shock wave angle and depth ratio of the abrupt deflected supercritical water flow was suggested,and a correction coefficient for the hydrodynamic pressure was introduced to generalize the momentum equation in the direction perpendicular to the shock front.It must be noticed that in the sloped channel the shock wave angle and the depth ratio are no longer constant as those in the horizontal channels,but slowly change along the shock front.The calculated results are in good agreement with measured data.展开更多
Imbalance arises when the Roe's method is directly applied in the shallow water simulation.The reasons are different for the continuity equation and the momentum equations.Based on the Roe's method,a partial s...Imbalance arises when the Roe's method is directly applied in the shallow water simulation.The reasons are different for the continuity equation and the momentum equations.Based on the Roe's method,a partial surface method is proposed for a perfect balance for the continuity equation.In order to generate a mathematically hyperbolic formulation,the momentum equations are split,which causes incompatibility in the calculation of the momentum equations.In this article a numerical approach named the Slop Flux Method(SFM)is proposed to balance the source terms and the flux gradient based on the finite volume method.The method is first applied to shallow water equations.The model is verified by analytical results of classical test cases with good agreement.Finally the method is applied to a steady flow simulation over a practical complicated topography and the result shows good balance and conservation.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.41672273,42177137)the Fundamental Research Funds for the Central Universities(22120180313)+1 种基金the support from China Scholarship Council(CSC)(202106260151)substantially supported by the Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education(Tongji University)。
文摘Due to the loose structure,high porosity and high permeability of soil-rock mixture slope,the slope is unstable and may cause huge economic losses and casualties.The h-type anti-slide pile is regarded as an effective means to prevent the instability of soilrock mixture slope.In this paper,a centrifuge model test was conducted to investigate the stress distribution of the h-type anti-slide pile and the evolution process of soil arching during the loading.A numerical simulation model was built based on the similar relationship between the centrifuge model and the prototype to investigate the influence factors of the pile spacing,anchored depth,and crossbeam stiffness,and some recommendations were proposed for its application.The results show that the bending moment distribution of the rear pile exhibits Wshaped,while for the front pile,its distribution resembles V-shaped.The soil arching evolution process during loading is gradually dissipated from bottom to top and from far to near.During the loading,the change of bending moment can be divided into three stages,namely,the stabilization stage,the slow growth stage,and the rapid growth stage.In engineering projects,the recommended values of the pile spacing,anchored depth,and crossbeam stiffness are 4.0d,2.0d,and 2.0EI,where d and EI are the diameter and bending stiffness of the h-type anti-slide pile respectively.
基金the Natural Science Foundation of Liaoning Province (Grant No.20062177)
文摘The effect of the bottom slope on abrupt deflected supercritical water flow was experimentally and theoretically studied.Model tests were conducted in a flume of 1.2 m wide and 2.6 m long with sloped bottom at an angle 35.54o,its length of deflector was 0.2 m and the deflection angles were 15o and 30o.An approximate method for calculatjng the shock wave angle and depth ratio of the abrupt deflected supercritical water flow was suggested,and a correction coefficient for the hydrodynamic pressure was introduced to generalize the momentum equation in the direction perpendicular to the shock front.It must be noticed that in the sloped channel the shock wave angle and the depth ratio are no longer constant as those in the horizontal channels,but slowly change along the shock front.The calculated results are in good agreement with measured data.
基金supported by the National Basic Research and Development Program of China(973Program,Grant No.2011CB409901)the Special Funds for Public Welfare Project(Grant No.200901014)the"12th Five-Year Plan"to Support Science and Technology Project(Grant No.2012BAB02B01)
文摘Imbalance arises when the Roe's method is directly applied in the shallow water simulation.The reasons are different for the continuity equation and the momentum equations.Based on the Roe's method,a partial surface method is proposed for a perfect balance for the continuity equation.In order to generate a mathematically hyperbolic formulation,the momentum equations are split,which causes incompatibility in the calculation of the momentum equations.In this article a numerical approach named the Slop Flux Method(SFM)is proposed to balance the source terms and the flux gradient based on the finite volume method.The method is first applied to shallow water equations.The model is verified by analytical results of classical test cases with good agreement.Finally the method is applied to a steady flow simulation over a practical complicated topography and the result shows good balance and conservation.
