The observation of diagenetic evolution and pore types of sedimentary rock in Taibei Sag of Tuha Basin shows that the pores of reservoir in Taibei Sag can be defined vertically into six types of the primary pore zones,the primary-induced pore zones,the induced pore zones,the reduced induced pore zones,the secondary induced pore zones and the secondary reduced induced pore zones.

In the course of study, the earthquake induced pore water pressure is closely related with the deformation and consolidation of tailings dam, thus the earthquake pore water pressure is introduced into the Biot's equation, which is then solved by 3-D equiparametric FEM to obtain deformation and residual pore water pressure.

In this investigation the earthquake induced pore water pressure is closely related with the deformation and consolidation of earth dam, thus the earthquake pore water pressure is introduced into the Biot' s equation, which is then solved by 3-D equiparametric FEM to obtain deformation and residual pore water pressure. The following items are computed: seismic dynamic stresses, dynamic strains, acceleration, residual pore water pressure and its variation with time, etc.

A threshold value of the cohesion of soil is introduced to distinguish the eventual failure modes, and two threshold values of the earthquake induced pore pressure ratio are introduced to evaluate the effect of shear strength reduction on the slope failure mechanism.

A threshold value of the cohesion of loess was introduced to distinguish the eventual failure modes,and two threshold values of the earthquake induced pore pressure ratio were given to evaluate the effect of shear strength reduction on the slope failure mechanism.

We demonstrate that as a result of production-induced pore pressure and stress changes, normal faulting appears to have spread out from the crests of the structures on to the flanks.

Dilatational-wave-induced pore-water pressure in soil

It is demonstrated that the radius of the radiation-induced pore nucleus exceeds the critical value.

Based on the mechanism of diffusion-strain instability of quasi-equilibrium excess vacancies in metal under irradiation, a model of nucleation of a radiation-induced pore is suggested.

A mechanism of radiation-induced pore formation and spatial ordering in metal systems is suggested.

In this paper the seismic stability of No. 4 tailing dam at Dexing Copper Mine is studied. Both static and dynamic response analyses have been carried out using nonlinear finite element technique. In these analyses the experimental data obtained from laboratory triaxial test of tailing meterials and two bed rock accelerographs recorded during Tangshan and Songpan earthquakes and scaled to the maximum accelerations of 200 and 400 gal respectively were used.In addition, a simplified method of evaluating the earthquake-...

In this paper the seismic stability of No. 4 tailing dam at Dexing Copper Mine is studied. Both static and dynamic response analyses have been carried out using nonlinear finite element technique. In these analyses the experimental data obtained from laboratory triaxial test of tailing meterials and two bed rock accelerographs recorded during Tangshan and Songpan earthquakes and scaled to the maximum accelerations of 200 and 400 gal respectively were used.In addition, a simplified method of evaluating the earthquake- induced pore pressure is given to predict the liquefaction potential of soil elements in the various parts of dam.

The earth dam at Yuecheng reservoir has been stabilized by a counter weight fill on the upstream slope to prevent its slide failure as result of static and seismic loading. In this paper, the performance of the dam sections with and without the counter weight fill has been compared by two-dimensional non-linear static and dynamic analysis. A static stress-strain analysis coupled with the seepage flow is used and the influence of sudden drop down of reservoir elevation is considered. An effective stress method...

The earth dam at Yuecheng reservoir has been stabilized by a counter weight fill on the upstream slope to prevent its slide failure as result of static and seismic loading. In this paper, the performance of the dam sections with and without the counter weight fill has been compared by two-dimensional non-linear static and dynamic analysis. A static stress-strain analysis coupled with the seepage flow is used and the influence of sudden drop down of reservoir elevation is considered. An effective stress method for dynamic analysis is suggested. All of computation is made by FEM with guadrilateral isoparametric elements. The effectiveness of the counter weight fill is evaluated through comparison of computed results in following items : static stress, flow net, factor of slope stability, time history of response acceleration, time history of response shear stress, maximum dynamic shear stress and strain, distribution of earthquake-induced pore pressure in the dam, earthquake-induced residual deformation, earthquake-induced displacement, dynamic stability coefficent, etc.This analysis shows that the counter weight fill on the upstream solpe is effective.

In this paper, by the use of 3-D dynamic analysis of effective stress, the dynamic response of Nanfen tailings dam of Benxi Iron and Steel Company under earthquake of intensity Ⅶ and seepage flow are researched. In the course of study, the earthquake induced pore water pressure is closely related with the deformation and consolidation of tailings dam, thus the earthquake pore water pressure is introduced into the Biot's equation, which is then solved by 3-D equiparametric FEM to obtain deformation...

In this paper, by the use of 3-D dynamic analysis of effective stress, the dynamic response of Nanfen tailings dam of Benxi Iron and Steel Company under earthquake of intensity Ⅶ and seepage flow are researched. In the course of study, the earthquake induced pore water pressure is closely related with the deformation and consolidation of tailings dam, thus the earthquake pore water pressure is introduced into the Biot's equation, which is then solved by 3-D equiparametric FEM to obtain deformation and residual pore water pressure. The following items are computed: seismic dynamic stress, dynamic strain, acceleration, generation, diffusion and dissipation of seismic pore water pressure, occurrence of liquefaction and its growth, etc. Finally, the computed results are compared with those by 2-D dynamic analysis.