This paper presents analytical solutions for the stress and displacement field in elastic layered geo-materials induced by an arbitrary point load in the Cartesian coordinate system. The point load solutions can be ob...This paper presents analytical solutions for the stress and displacement field in elastic layered geo-materials induced by an arbitrary point load in the Cartesian coordinate system. The point load solutions can be obtained by referring to the integral transform and the transfer matrix technique. However, former solutions usually exist in the cylindrical coordinate system subjected, to axisymmetric loading. Based on the proposed solutions in the Cartesian coordinate, it is very easy to solve asymmetric problems and consider the condition with internal loads in multi-layered geo-materials. Moreover, point load solutions can be used to construct solutions for analytical examination of elastic problems and incorporated into numerical schemes such as boundary element methods. The results discussed in this paper indicate that there is no problem in the evaluation of the point load solutions with high accuracy and efficiency, and that the material non-homogeneity has a significant effect on the elastic field due to adjacent loading.展开更多
Based on the cylindrical cavity expansion theory, a plastic-damage-elastic model is proposed for the penetration problem of geo-material. In the model, the unified strength criterion (Yu, 1991) is adopted as the failu...Based on the cylindrical cavity expansion theory, a plastic-damage-elastic model is proposed for the penetration problem of geo-material. In the model, the unified strength criterion (Yu, 1991) is adopted as the failure criterion. The distributions of the radial stress and velocity are analyzed. According to the Newton's second law, a series results of the final penetration depth and the impedance load are obtained to different parameter b, when a rigid projectile normally impacts and penetrates a semi-infinite geo-material target with an impact velocity of 300-1200 m/s. By comparing with the test data available, it appears that the method can be used in analyzing the final depth and the impedance load of a rigid projectile penetrating into a semi-infinite target with different impact velocities.展开更多
In this paper we analyzed a real fill-type dam,named the Minami-Aiki Dam,to verify a numerical consolidation method with an elastoplastic model for unsaturated soils.The validities were conducted by comparing the anal...In this paper we analyzed a real fill-type dam,named the Minami-Aiki Dam,to verify a numerical consolidation method with an elastoplastic model for unsaturated soils.The validities were conducted by comparing the analyzed and measured values during construction and impounding.The settlements calculated showed good agreement to those observed.Though the changing patterns of the measured and calculated pore water pressures were similar,the amounts of pore water pressures induced by the self-weights of embankment and the dissipation speeds were different.The earth pressures measured at the bottom of the core zone showed good agreement with those calculated.This method is valid for estimating behavior of fill-type dams during construction and impounding.展开更多
基金Project supported by the National Natural Science Foundation of China (No. 51008188)the China Postdoctoral Science Foundation (No. 20100470677)
文摘This paper presents analytical solutions for the stress and displacement field in elastic layered geo-materials induced by an arbitrary point load in the Cartesian coordinate system. The point load solutions can be obtained by referring to the integral transform and the transfer matrix technique. However, former solutions usually exist in the cylindrical coordinate system subjected, to axisymmetric loading. Based on the proposed solutions in the Cartesian coordinate, it is very easy to solve asymmetric problems and consider the condition with internal loads in multi-layered geo-materials. Moreover, point load solutions can be used to construct solutions for analytical examination of elastic problems and incorporated into numerical schemes such as boundary element methods. The results discussed in this paper indicate that there is no problem in the evaluation of the point load solutions with high accuracy and efficiency, and that the material non-homogeneity has a significant effect on the elastic field due to adjacent loading.
文摘Based on the cylindrical cavity expansion theory, a plastic-damage-elastic model is proposed for the penetration problem of geo-material. In the model, the unified strength criterion (Yu, 1991) is adopted as the failure criterion. The distributions of the radial stress and velocity are analyzed. According to the Newton's second law, a series results of the final penetration depth and the impedance load are obtained to different parameter b, when a rigid projectile normally impacts and penetrates a semi-infinite geo-material target with an impact velocity of 300-1200 m/s. By comparing with the test data available, it appears that the method can be used in analyzing the final depth and the impedance load of a rigid projectile penetrating into a semi-infinite target with different impact velocities.
文摘In this paper we analyzed a real fill-type dam,named the Minami-Aiki Dam,to verify a numerical consolidation method with an elastoplastic model for unsaturated soils.The validities were conducted by comparing the analyzed and measured values during construction and impounding.The settlements calculated showed good agreement to those observed.Though the changing patterns of the measured and calculated pore water pressures were similar,the amounts of pore water pressures induced by the self-weights of embankment and the dissipation speeds were different.The earth pressures measured at the bottom of the core zone showed good agreement with those calculated.This method is valid for estimating behavior of fill-type dams during construction and impounding.
