Unconfined seepage field of arch dam abutment slope was studied. This paper is composed of two parts. The first part concerns with the numerical methods used in the analysis, which includes the identification of rock ...Unconfined seepage field of arch dam abutment slope was studied. This paper is composed of two parts. The first part concerns with the numerical methods used in the analysis, which includes the identification of rock blocky system and the algorithm of the unconfined seepage flow in the discontinuity network with the consideration of the grouting curtain and drainage curtain. In the second part a complicated arch dam abutment slope was studied, for which the seepage flow field characteristics was analyzed and the seepage control system was evaluated.展开更多
Based on the consistency-viscoplastic constitutive model,the static William-Warnke model with three-parameters is modified and a consistency-viscoplastic William-Warnke model with three-parameters is developed that co...Based on the consistency-viscoplastic constitutive model,the static William-Warnke model with three-parameters is modified and a consistency-viscoplastic William-Warnke model with three-parameters is developed that considers the effect of strain rates. Then,the tangent modulus of the consistency viscoplastic model is introduced and an implicit backward Elure iterative algorithm is developed. Comparisons between the numerical simulations and experimental data show that the consistency model properly provides the uniaxial and biaxial dynamic behaviors of concrete. To study the effect of strain rates on the dynamic response of concrete structures,the proposed model is used in the analysis of the dynamic response of a simply-supported beam and the results show that the strain rate has a significant effect on the displacement and stress magnitudes and distributions. Finally,the seismic responses of a 278 m high arch dam are obtained and compared by using the linear elastic model,as well as rate-independent and rate-dependent William-Warnke three-parameter models. The results indicate that the strain rate affects the first principal stresses,and the maximal equivalent viscoplastic strain rate of the arch dam. Numerical calculations and analyses reveal that considering the strain rate is important in the safety assessments of arch dams located in seismically active areas.展开更多
基金Project supported by the National Natural Science Foundation of China.( No.599790 2 1 )
文摘Unconfined seepage field of arch dam abutment slope was studied. This paper is composed of two parts. The first part concerns with the numerical methods used in the analysis, which includes the identification of rock blocky system and the algorithm of the unconfined seepage flow in the discontinuity network with the consideration of the grouting curtain and drainage curtain. In the second part a complicated arch dam abutment slope was studied, for which the seepage flow field characteristics was analyzed and the seepage control system was evaluated.
基金Naitonal Natural Science Foundation of China Under Grant No.90815026Foundation of National Seismic Bureau Under Grant No.200808074
文摘Based on the consistency-viscoplastic constitutive model,the static William-Warnke model with three-parameters is modified and a consistency-viscoplastic William-Warnke model with three-parameters is developed that considers the effect of strain rates. Then,the tangent modulus of the consistency viscoplastic model is introduced and an implicit backward Elure iterative algorithm is developed. Comparisons between the numerical simulations and experimental data show that the consistency model properly provides the uniaxial and biaxial dynamic behaviors of concrete. To study the effect of strain rates on the dynamic response of concrete structures,the proposed model is used in the analysis of the dynamic response of a simply-supported beam and the results show that the strain rate has a significant effect on the displacement and stress magnitudes and distributions. Finally,the seismic responses of a 278 m high arch dam are obtained and compared by using the linear elastic model,as well as rate-independent and rate-dependent William-Warnke three-parameter models. The results indicate that the strain rate affects the first principal stresses,and the maximal equivalent viscoplastic strain rate of the arch dam. Numerical calculations and analyses reveal that considering the strain rate is important in the safety assessments of arch dams located in seismically active areas.
