Dynamic strength parameters are extensively used in mining engineering and rock mechanics.However,there are no widely accepted dynamic failure models for rocks.In this study,the dynamic punching shear strength,uniaxia...Dynamic strength parameters are extensively used in mining engineering and rock mechanics.However,there are no widely accepted dynamic failure models for rocks.In this study,the dynamic punching shear strength,uniaxial compressive strength(UCS) and tensile strength of fine-grained Fangshan marble(FM)are first measured by using a split Hopkinson pressure bar(SHPB) system.The pulse-shaping technique is then implemented to maintain the dynamic force balance in SHPB tests.Experimental results show that the dynamic punching shear strength,UCS and tensile strength increase with the loading rate.A recently developed dynamic Mohr-Coulomb theory is then used to interpret the testing data.In this model,the angle of internal friction φ is assumed to be independent of loading rate and is obtained using the static strength values.According to the dynamic Mohr-Coulomb theory,the dynamic UCS and the dynamic tensile strength are predicted from the dynamic punching shear strength.Furthermore,based on this dynamic theory,the dynamic UCS is predicted from the dynamic tensile strength.The consistency between the predicted and measured dynamic strengths demonstrates that the dynamic Mohr-Coulomb theory is applicable to FM.展开更多
The rural settlement landscape in Fangshan District has multiple values,but there is a lack ofsystematic research.Geographical environment and historical evolution in Fangshan District are analyzed,and it is thought t...The rural settlement landscape in Fangshan District has multiple values,but there is a lack ofsystematic research.Geographical environment and historical evolution in Fangshan District are analyzed,and it is thought that the combination of the two forms characteristic cultural landscape in the village.According to literature and research,villages in Fangshan District are classifi ed and summarized accordingto the time of forming,the motivation of development and the form,and they are analyzed from multidimension.Meanwhile,the problems of development and protection are concerned.Based on the aboveresearch,this paper makes a more appropriate analysis on the cultural landscape value of villages inFangshan District.Finally,the protection strategy of the whole region and key areas is proposed.展开更多
In July 2021,ten teachers and students from the Design Innovation Practice Group of the College of Design and Art carried outaone-weekfield investigation in Fangshan county,Lyuliang city,Shanxi province during the des...In July 2021,ten teachers and students from the Design Innovation Practice Group of the College of Design and Art carried outaone-weekfield investigation in Fangshan county,Lyuliang city,Shanxi province during the designand serviceprojectof Beijing Institute of Technology's counterpart support forthe integration development of culture and tourism in Fangshan county.Fortunately,as one of the leading teachers of the practice group,l experienced the cultural journey of“Rural Revitalization,Fangshan has Me”withthe students.展开更多
The data of REE for the dioritic enclaves of the second intrusive bodies and for apatite,sphene,magnetite,zircon amphibole,biotite,plagioclase,and K-feldspar of the host rock are systematically reported andthe feature...The data of REE for the dioritic enclaves of the second intrusive bodies and for apatite,sphene,magnetite,zircon amphibole,biotite,plagioclase,and K-feldspar of the host rock are systematically reported andthe features of their compositions,overall characteristics and changing regularities,and their petrogenetic signifi-cance are discussed.The characteristics of the compositiom of the mineral rare-earth elements and their changingregularities for the Fangshan Rock Body show that there is a cognate evolution relation between the enclavesand the rock body.It is oonsidered that the dioritic enclaves might be the product derived from the earlycrystallization of homogeneous magma.展开更多
基金provided by the Natural Sciences and Engineering Research Council of Canada(NSERC)through the Discovery Grant No.72031326
文摘Dynamic strength parameters are extensively used in mining engineering and rock mechanics.However,there are no widely accepted dynamic failure models for rocks.In this study,the dynamic punching shear strength,uniaxial compressive strength(UCS) and tensile strength of fine-grained Fangshan marble(FM)are first measured by using a split Hopkinson pressure bar(SHPB) system.The pulse-shaping technique is then implemented to maintain the dynamic force balance in SHPB tests.Experimental results show that the dynamic punching shear strength,UCS and tensile strength increase with the loading rate.A recently developed dynamic Mohr-Coulomb theory is then used to interpret the testing data.In this model,the angle of internal friction φ is assumed to be independent of loading rate and is obtained using the static strength values.According to the dynamic Mohr-Coulomb theory,the dynamic UCS and the dynamic tensile strength are predicted from the dynamic punching shear strength.Furthermore,based on this dynamic theory,the dynamic UCS is predicted from the dynamic tensile strength.The consistency between the predicted and measured dynamic strengths demonstrates that the dynamic Mohr-Coulomb theory is applicable to FM.
文摘The rural settlement landscape in Fangshan District has multiple values,but there is a lack ofsystematic research.Geographical environment and historical evolution in Fangshan District are analyzed,and it is thought that the combination of the two forms characteristic cultural landscape in the village.According to literature and research,villages in Fangshan District are classifi ed and summarized accordingto the time of forming,the motivation of development and the form,and they are analyzed from multidimension.Meanwhile,the problems of development and protection are concerned.Based on the aboveresearch,this paper makes a more appropriate analysis on the cultural landscape value of villages inFangshan District.Finally,the protection strategy of the whole region and key areas is proposed.
文摘In July 2021,ten teachers and students from the Design Innovation Practice Group of the College of Design and Art carried outaone-weekfield investigation in Fangshan county,Lyuliang city,Shanxi province during the designand serviceprojectof Beijing Institute of Technology's counterpart support forthe integration development of culture and tourism in Fangshan county.Fortunately,as one of the leading teachers of the practice group,l experienced the cultural journey of“Rural Revitalization,Fangshan has Me”withthe students.
基金the Scientific Development Fund of Peking UniversityZhongguancun Testing Fund Beijing,Chjna
文摘The data of REE for the dioritic enclaves of the second intrusive bodies and for apatite,sphene,magnetite,zircon amphibole,biotite,plagioclase,and K-feldspar of the host rock are systematically reported andthe features of their compositions,overall characteristics and changing regularities,and their petrogenetic signifi-cance are discussed.The characteristics of the compositiom of the mineral rare-earth elements and their changingregularities for the Fangshan Rock Body show that there is a cognate evolution relation between the enclavesand the rock body.It is oonsidered that the dioritic enclaves might be the product derived from the earlycrystallization of homogeneous magma.
