In a large ancient landslide,approximately 240,000 m3 of sediments were reactivated,posing a grave threat to the safety of iron ore stopes.To trace the deformation and evolution history of reactivated Landslide,we con...In a large ancient landslide,approximately 240,000 m3 of sediments were reactivated,posing a grave threat to the safety of iron ore stopes.To trace the deformation and evolution history of reactivated Landslide,we conducted geological surveys and combined real-time monitoring equipment to analyze the landslide data since 1986 and the deformation status of the reactivated Landslide.A multi-factor comprehensive landslide monitoring method and an Newton force early warning system(NFEWS)were established,focusing on underground stress,surface deformation information and landslide stability.Furthermore,we developed a four-level early warning grading standard,employing surface cracks and changes in underground stress thresholds as early warning indicators.This standard adds expert assessment to avoid false alarms and realize real-time dynamics of mining landslides during excavation and transportation.Through the case study and analysis of Nanfen open-pit mine,the NFEWS system offers valuable insights and solution for early warning of landslides in analogous open-pit mines.Finally,the evaluation index system of landslide hazard susceptibility was established by selecting the Newton force influence factor.A landslide susceptibility zoning map is constructed using the information value model.The rationality and accuracy are assessed from three perspectives:frequency ratio,landslide hazard point density,and receiver operating characteristic(ROC)curve.The improved Newton force landslide early warning system provides a good reference for the analysis and monitoring of the creep landslide evolution process.展开更多
目的探讨应用特殊复位器经皮摇杆复位顺行髓内钉(intramedullary nailing,IMN)治疗移位股骨干骨折(fracture of shaft of femur,FSFs)的手术方法和临床疗效。方法将单侧股骨干骨折患者76例随机分为对照组(39例)和观察组(37例),对照组采...目的探讨应用特殊复位器经皮摇杆复位顺行髓内钉(intramedullary nailing,IMN)治疗移位股骨干骨折(fracture of shaft of femur,FSFs)的手术方法和临床疗效。方法将单侧股骨干骨折患者76例随机分为对照组(39例)和观察组(37例),对照组采用传统复位方法IMN固定治疗移位FSFs,观察组应用特殊复位器(T形钉)作为摇杆经皮复位IMN固定治疗移位FSFs。比较2组手术时间、术中复位时间、透视时间、术中出血量,观察并记录患者术后患肢骨折愈合时间及功能恢复情况。结果观察组应用T形钉复位均达到闭合复位,对照组4例患者需切开复位;观察组手术时间、复位时间、术中透视时间、术中出血量明显短于或少于对照组,差异有统计学意义(P<0.05)。2组骨折愈合时间及优良标准率差异无统计学意义(P>0.05)。结论应用特殊复位器(T形钉)经皮摇杆复位IMN固定治疗移位FSFs具有快速闭合复位、手术时间短、出血量少、透视时间短、功能恢复好等优点,值得临床应用和推广。展开更多
研究T6处理、深冷处理和T6+深冷处理对ZCuAl 10 Fe 3Mn 2合金微观组织、力学性能以及在室温至450℃下的热疲劳行为。通过XRD,OM,SEM,EDS对合金组织和裂纹形貌进行观察分析。结果表明:T6+深冷复合处理工艺能够显著改善ZCuAl 10 Fe 3Mn 2...研究T6处理、深冷处理和T6+深冷处理对ZCuAl 10 Fe 3Mn 2合金微观组织、力学性能以及在室温至450℃下的热疲劳行为。通过XRD,OM,SEM,EDS对合金组织和裂纹形貌进行观察分析。结果表明:T6+深冷复合处理工艺能够显著改善ZCuAl 10 Fe 3Mn 2合金的力学性能和微观组织。与T6处理相比,其抗拉强度、硬度以及伸长率分别提高了7.28%,16.96%和23.53%;其α相进一步细化且分布更加均匀,位错密度增加,使得合金整体的组织均匀性、致密性更好。综合性能的提高也有效地提高了合金的热疲劳性能,其抗热应力和氧化腐蚀的能力增强。在相同冷热循环次数下,疲劳裂纹长度最短,裂纹生长速率最慢。展开更多
基金the National Natural Science Foundation of China(NSFC)(41941018 and 52304111)the Program of China Scholarship Council(202206430007)。
文摘In a large ancient landslide,approximately 240,000 m3 of sediments were reactivated,posing a grave threat to the safety of iron ore stopes.To trace the deformation and evolution history of reactivated Landslide,we conducted geological surveys and combined real-time monitoring equipment to analyze the landslide data since 1986 and the deformation status of the reactivated Landslide.A multi-factor comprehensive landslide monitoring method and an Newton force early warning system(NFEWS)were established,focusing on underground stress,surface deformation information and landslide stability.Furthermore,we developed a four-level early warning grading standard,employing surface cracks and changes in underground stress thresholds as early warning indicators.This standard adds expert assessment to avoid false alarms and realize real-time dynamics of mining landslides during excavation and transportation.Through the case study and analysis of Nanfen open-pit mine,the NFEWS system offers valuable insights and solution for early warning of landslides in analogous open-pit mines.Finally,the evaluation index system of landslide hazard susceptibility was established by selecting the Newton force influence factor.A landslide susceptibility zoning map is constructed using the information value model.The rationality and accuracy are assessed from three perspectives:frequency ratio,landslide hazard point density,and receiver operating characteristic(ROC)curve.The improved Newton force landslide early warning system provides a good reference for the analysis and monitoring of the creep landslide evolution process.
文摘目的探讨应用特殊复位器经皮摇杆复位顺行髓内钉(intramedullary nailing,IMN)治疗移位股骨干骨折(fracture of shaft of femur,FSFs)的手术方法和临床疗效。方法将单侧股骨干骨折患者76例随机分为对照组(39例)和观察组(37例),对照组采用传统复位方法IMN固定治疗移位FSFs,观察组应用特殊复位器(T形钉)作为摇杆经皮复位IMN固定治疗移位FSFs。比较2组手术时间、术中复位时间、透视时间、术中出血量,观察并记录患者术后患肢骨折愈合时间及功能恢复情况。结果观察组应用T形钉复位均达到闭合复位,对照组4例患者需切开复位;观察组手术时间、复位时间、术中透视时间、术中出血量明显短于或少于对照组,差异有统计学意义(P<0.05)。2组骨折愈合时间及优良标准率差异无统计学意义(P>0.05)。结论应用特殊复位器(T形钉)经皮摇杆复位IMN固定治疗移位FSFs具有快速闭合复位、手术时间短、出血量少、透视时间短、功能恢复好等优点,值得临床应用和推广。
文摘研究T6处理、深冷处理和T6+深冷处理对ZCuAl 10 Fe 3Mn 2合金微观组织、力学性能以及在室温至450℃下的热疲劳行为。通过XRD,OM,SEM,EDS对合金组织和裂纹形貌进行观察分析。结果表明:T6+深冷复合处理工艺能够显著改善ZCuAl 10 Fe 3Mn 2合金的力学性能和微观组织。与T6处理相比,其抗拉强度、硬度以及伸长率分别提高了7.28%,16.96%和23.53%;其α相进一步细化且分布更加均匀,位错密度增加,使得合金整体的组织均匀性、致密性更好。综合性能的提高也有效地提高了合金的热疲劳性能,其抗热应力和氧化腐蚀的能力增强。在相同冷热循环次数下,疲劳裂纹长度最短,裂纹生长速率最慢。
