Typical existing methods of tunnel geological prediction include negative apparent velocity, horizontal seismic profile, and the Tunnel Seismic Prediction （TSP） method as this technology is under development at home...Typical existing methods of tunnel geological prediction include negative apparent velocity, horizontal seismic profile, and the Tunnel Seismic Prediction （TSP） method as this technology is under development at home and abroad. Considering simpler observational methods and data processing, it is hard to accurately determine the seismic velocity of the wall rock in the front of the tunnel face. Therefore, applying these defective methods may result in inaccurate geological inferences which will not provide sufficient evidence for classifying the wall rock characteristics. This paper proposes the Tunnel Seismic Tomography （TST） method using a spatial observation arrangement and migration and travel time inversion image processing to solve the problem of analyzing the velocity structure of wall rock in the front of the tunnel face and realize accurate imaging of the geological framework of the tunnel wall rock. This method is very appropriate for geological prediction under complex geological conditions.展开更多
纤维金属层板(Fiber metal laminates,FMLs)因其优良的疲劳性能以及高损伤容限,成为航空航天领域重要的结构材料,并愈加受到汽车、轨道交通等领域的关注。本文在综述FMLs发展概况的基础上,重点介绍了新型铝锂合金GLARE层板、热塑性Ti/Cf...纤维金属层板(Fiber metal laminates,FMLs)因其优良的疲劳性能以及高损伤容限,成为航空航天领域重要的结构材料,并愈加受到汽车、轨道交通等领域的关注。本文在综述FMLs发展概况的基础上,重点介绍了新型铝锂合金GLARE层板、热塑性Ti/Cf/PEEK层板及新一代聚酰亚胺FMLs层板的研究工作。同时针对FMLs的失效行为复杂、一些性能评价方法还不够完善等现状,评述了深入开展FMLs失效行为研究、采用计算机仿真技术进行其综合性能预测研究的重要性。最后,回顾了FMLs传统成形方法,如自成形技术和滚弯成形技术,并探讨了喷丸成形和液压成形在FMLs构件制造中的应用。展开更多
基金the National Natural Science Foundation of China under Grant Nos.60573082, 90718042(国家自然科学基金)the National High-Tech Research and Development Plan of China under Grant No.2007AA010303(国家高技术研究发展计划(863))the National Basic Research Program of China under Grant No.2007CB310802(国家重点基础研究发展计划(973))
文摘Typical existing methods of tunnel geological prediction include negative apparent velocity, horizontal seismic profile, and the Tunnel Seismic Prediction （TSP） method as this technology is under development at home and abroad. Considering simpler observational methods and data processing, it is hard to accurately determine the seismic velocity of the wall rock in the front of the tunnel face. Therefore, applying these defective methods may result in inaccurate geological inferences which will not provide sufficient evidence for classifying the wall rock characteristics. This paper proposes the Tunnel Seismic Tomography （TST） method using a spatial observation arrangement and migration and travel time inversion image processing to solve the problem of analyzing the velocity structure of wall rock in the front of the tunnel face and realize accurate imaging of the geological framework of the tunnel wall rock. This method is very appropriate for geological prediction under complex geological conditions.
文摘纤维金属层板(Fiber metal laminates,FMLs)因其优良的疲劳性能以及高损伤容限,成为航空航天领域重要的结构材料,并愈加受到汽车、轨道交通等领域的关注。本文在综述FMLs发展概况的基础上,重点介绍了新型铝锂合金GLARE层板、热塑性Ti/Cf/PEEK层板及新一代聚酰亚胺FMLs层板的研究工作。同时针对FMLs的失效行为复杂、一些性能评价方法还不够完善等现状,评述了深入开展FMLs失效行为研究、采用计算机仿真技术进行其综合性能预测研究的重要性。最后,回顾了FMLs传统成形方法,如自成形技术和滚弯成形技术,并探讨了喷丸成形和液压成形在FMLs构件制造中的应用。
