Only one access road leads into Denali Park. The serviceability and safety of this gravel road is obviously of paramount importance to the National Park Service (NPS). Since the late 1950s and mid-1960s major icings a...Only one access road leads into Denali Park. The serviceability and safety of this gravel road is obviously of paramount importance to the National Park Service (NPS). Since the late 1950s and mid-1960s major icings and a landslide, respectively, have occurred along the Denali Park access road. During the summer of 1990 the landslide activity intensified. The central section of the Park through which the access road traverses is designated as a wilderness area. Consequently, off road field exploration required to quantify the hazards and remediation activities that may be proposed to mitigate icings and stabilize the landslide, are severely restricted and closely scrutinized by the NPS. The results of an evaluation of (1) the current state-of-the-practice to control icings, and (2) thaw stabilization techniques that could be applied to the northwest corner of the landslide are presented herein. The recommendations which followed, respecting the wilderness area designation for the Park, are also presented.展开更多
以国内首条20 mm重冰区500 k V同塔双回线路——茂茂线为依托,利用数值模拟方法对各种脱冰工况下导线脱冰动力响应进行研究,得出了导线脱冰跳跃高度和横摆距离工程实用化公式,并总结出脱冰过程中杆塔动力荷载变化规律。在此基础上对20 m...以国内首条20 mm重冰区500 k V同塔双回线路——茂茂线为依托,利用数值模拟方法对各种脱冰工况下导线脱冰动力响应进行研究,得出了导线脱冰跳跃高度和横摆距离工程实用化公式,并总结出脱冰过程中杆塔动力荷载变化规律。在此基础上对20 mm重冰区500 k V同塔双回线路路径选择、绝缘配置、塔头尺寸控制条件、铁塔荷载和铁塔型式等方面进行研究,基本理清了重冰区同塔双回线路的设计方法和思路,可为后续重冰同塔双回线路设计提供重要参考。展开更多
文摘Only one access road leads into Denali Park. The serviceability and safety of this gravel road is obviously of paramount importance to the National Park Service (NPS). Since the late 1950s and mid-1960s major icings and a landslide, respectively, have occurred along the Denali Park access road. During the summer of 1990 the landslide activity intensified. The central section of the Park through which the access road traverses is designated as a wilderness area. Consequently, off road field exploration required to quantify the hazards and remediation activities that may be proposed to mitigate icings and stabilize the landslide, are severely restricted and closely scrutinized by the NPS. The results of an evaluation of (1) the current state-of-the-practice to control icings, and (2) thaw stabilization techniques that could be applied to the northwest corner of the landslide are presented herein. The recommendations which followed, respecting the wilderness area designation for the Park, are also presented.
文摘以国内首条20 mm重冰区500 k V同塔双回线路——茂茂线为依托,利用数值模拟方法对各种脱冰工况下导线脱冰动力响应进行研究,得出了导线脱冰跳跃高度和横摆距离工程实用化公式,并总结出脱冰过程中杆塔动力荷载变化规律。在此基础上对20 mm重冰区500 k V同塔双回线路路径选择、绝缘配置、塔头尺寸控制条件、铁塔荷载和铁塔型式等方面进行研究,基本理清了重冰区同塔双回线路的设计方法和思路,可为后续重冰同塔双回线路设计提供重要参考。
