In this paper, a theory of landslide model testing and application in Three Gorges reservoir area were introduced.Based on geo-mechanical model tests, the similarity ratio of similar material parameters, component of ...In this paper, a theory of landslide model testing and application in Three Gorges reservoir area were introduced.Based on geo-mechanical model tests, the similarity ratio of similar material parameters, component of similar material and the boundary friction coefficient of the 2D earth landslide model test were derived and stated by theoretical and experimental methods.A model test of the Qianjiangping landslide in Three Gorges reservoir area reveal a two-step trigger mechanism of coexistence between retrogressive landslide and thrust load caused land-slide.展开更多
This study comprehensively considered the climate, soil, terrain, and land-use type conditions suitable for Rosa damascena trigintipetala and further established an ecological suitability evaluation model of R. damasc...This study comprehensively considered the climate, soil, terrain, and land-use type conditions suitable for Rosa damascena trigintipetala and further established an ecological suitability evaluation model of R. damascena triginffpetala in Sichuan Province, China, based on geographic information systems （GIS） and Agro-Ecological Zone （AEZ） models; then we assessed the different ecological suitability grades for this species in Sichuan Province of China and summarized the suitable land areas and spatial distribution pattern for R. damascena trigintipetala. The results show that the suitable areas （which contain highly suitable, generally suitable, and critically suitable areas） for R. damascena trigintipetala are 307.268×lO4 hm^2, which accounts for 6.34% of the total provincial area. Results also indicate that shrub land and open forest land are the major land-use types suitable for R. damascena trigintipetala, with the suitable areas of 303.162×lO4 hm2 （6.25% of the total provincial area）. An introduction test was conducted in one of the suitable areas, Xichang City, which demonstrated that R. damascena trigintipetala grows well at theexperimental sites. The quality of rose oil extracted from R. damascena trigintipetala planted in Xichang meets the Bulgaria Rose Oil Standard, thus verifying the accuracy and reliability of the ecological suitability assessment results.展开更多
The damage evolution in steel reinforced high strength concrete(SRHSC) frame columns was studied based on the test results of cyclic reversed loading experiment of 12 frame column specimens with various axial compress...The damage evolution in steel reinforced high strength concrete(SRHSC) frame columns was studied based on the test results of cyclic reversed loading experiment of 12 frame column specimens with various axial compression rations,stirrups ratios,steel rations and loading histories.The variation law of the ultimate bearing capacity,ultimate deformation and ultimate hysteretic energy dissipation of specimens under different loading protocols was obtained.The seismic damage characteristics,as well as strength and stiffness degradation,of SRHSC frame columns were analyzed.Based on the analysis of the nonlinear double parameters combination of deformation and energy,a damage model that can well reflect the mechanical characteristics of members subjected to a horizontal earthquake action was established by considering the effects of the number of the loading cycles on the ultimate resistance capacity(ultimate deformation and ultimate energy dissipation capacity) of members,and the loading history on damage,etc.According to the test results,the related parameters of the damage model were proposed.Finally,the damage model proposed was validated by the test results.Results indicated that the proposed damage model is theoretically more reasonable and can accurately describe the seismic damage evolution of the SRHSC frame columns.The results also can be used as a new theoretic reference for the establishment of damage-based earthquake-resistant design method of SRHSC members.展开更多
基金Supported by the National Natural Science Foundation of China(50839004)Key Projects of the National Science & Technology Pillar Program in the 11th Five-year Plan(2008BAC47B03)Scientific Fund of Hubei Provincial Education Department(Q20081305)
文摘In this paper, a theory of landslide model testing and application in Three Gorges reservoir area were introduced.Based on geo-mechanical model tests, the similarity ratio of similar material parameters, component of similar material and the boundary friction coefficient of the 2D earth landslide model test were derived and stated by theoretical and experimental methods.A model test of the Qianjiangping landslide in Three Gorges reservoir area reveal a two-step trigger mechanism of coexistence between retrogressive landslide and thrust load caused land-slide.
基金funded by the National Natural Science Foundation of China (Grant N0s. 41201274, D010505)The Spark Project (No. 2010GA600017) The Knowledge Innovation Program of CAS, China (No. KSCX2-YW-NF-01)
文摘This study comprehensively considered the climate, soil, terrain, and land-use type conditions suitable for Rosa damascena trigintipetala and further established an ecological suitability evaluation model of R. damascena triginffpetala in Sichuan Province, China, based on geographic information systems （GIS） and Agro-Ecological Zone （AEZ） models; then we assessed the different ecological suitability grades for this species in Sichuan Province of China and summarized the suitable land areas and spatial distribution pattern for R. damascena trigintipetala. The results show that the suitable areas （which contain highly suitable, generally suitable, and critically suitable areas） for R. damascena trigintipetala are 307.268×lO4 hm^2, which accounts for 6.34% of the total provincial area. Results also indicate that shrub land and open forest land are the major land-use types suitable for R. damascena trigintipetala, with the suitable areas of 303.162×lO4 hm2 （6.25% of the total provincial area）. An introduction test was conducted in one of the suitable areas, Xichang City, which demonstrated that R. damascena trigintipetala grows well at theexperimental sites. The quality of rose oil extracted from R. damascena trigintipetala planted in Xichang meets the Bulgaria Rose Oil Standard, thus verifying the accuracy and reliability of the ecological suitability assessment results.
基金supported by the National Natural Science Foundation of China (Grant Nos. 90815005, 50978218)Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20106120110003)the Educational Office of Shan'xi Province in China (Grant No.2010JK633)
文摘The damage evolution in steel reinforced high strength concrete(SRHSC) frame columns was studied based on the test results of cyclic reversed loading experiment of 12 frame column specimens with various axial compression rations,stirrups ratios,steel rations and loading histories.The variation law of the ultimate bearing capacity,ultimate deformation and ultimate hysteretic energy dissipation of specimens under different loading protocols was obtained.The seismic damage characteristics,as well as strength and stiffness degradation,of SRHSC frame columns were analyzed.Based on the analysis of the nonlinear double parameters combination of deformation and energy,a damage model that can well reflect the mechanical characteristics of members subjected to a horizontal earthquake action was established by considering the effects of the number of the loading cycles on the ultimate resistance capacity(ultimate deformation and ultimate energy dissipation capacity) of members,and the loading history on damage,etc.According to the test results,the related parameters of the damage model were proposed.Finally,the damage model proposed was validated by the test results.Results indicated that the proposed damage model is theoretically more reasonable and can accurately describe the seismic damage evolution of the SRHSC frame columns.The results also can be used as a new theoretic reference for the establishment of damage-based earthquake-resistant design method of SRHSC members.
