Do research on tunnel passing through bad geological section.
隧道穿越不良地质段施工技术的研究。
The crack disasters of bridge are common in Guangyuan section on the 108 National Highway because of complex geological and geomorphological conditions, heavy loading and bad quality of construction.
国道108线广元段由于地质地貌条件复杂、重载作用及施工质量未能保证，桥梁裂缝病害较为普遍。
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