The thawing-melting of the permafrost damages the subground of highways on the Qinghai-Tibet Plateau.With the application of ground-penetrating-radar(GPR)technology,the maximum permafrost melting interface can be effe...The thawing-melting of the permafrost damages the subground of highways on the Qinghai-Tibet Plateau.With the application of ground-penetrating-radar(GPR)technology,the maximum permafrost melting interface can be effectively distinctly differentiated and imaged.A hierarchical feature of the permafrost region is shown clearly on the imaging profile of GPR data.The complete ablation zone or part of it is displayed distinctly.In addition,the details of subsurface layers can be effectively characterized by GPR attribute-analysis technology.With the attribute calculation and filter,the instantaneous amplitude,instantaneous frequency,and relative wave impedance can be applied in a more efficient way to divide the complete ablation zone,part of the ablation and non-ablation interface.The relative distribution of water content in a seasonally thawing permafrost region can be obtained through a comprehensive GPR attribute analysis.展开更多
Two design axioms and axiomatic approach were discussed. As an example of application, design process of a new style single prop was illustrated in term of axi- oms.
基金supported by the Fundamental Research Funds for the Central Universities (2015JBM064)the 49th Project Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars infrastructure in State Education Ministry,and the research project entitled "The freezing injury evaluation of subgrade and remediation technology research in Shenchi-Shuozhou Railway" (No. 2015-10)
文摘The thawing-melting of the permafrost damages the subground of highways on the Qinghai-Tibet Plateau.With the application of ground-penetrating-radar(GPR)technology,the maximum permafrost melting interface can be effectively distinctly differentiated and imaged.A hierarchical feature of the permafrost region is shown clearly on the imaging profile of GPR data.The complete ablation zone or part of it is displayed distinctly.In addition,the details of subsurface layers can be effectively characterized by GPR attribute-analysis technology.With the attribute calculation and filter,the instantaneous amplitude,instantaneous frequency,and relative wave impedance can be applied in a more efficient way to divide the complete ablation zone,part of the ablation and non-ablation interface.The relative distribution of water content in a seasonally thawing permafrost region can be obtained through a comprehensive GPR attribute analysis.
文摘Two design axioms and axiomatic approach were discussed. As an example of application, design process of a new style single prop was illustrated in term of axi- oms.
