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我国是一个多地震国家。从1966年至1976年短短11年中,先后发生6级以上地震90余次,7级以上15次(震中烈度均在9度及9度以上)。每次较大地震都造成财产损失,人员伤亡。公路工程遭到不同程度破坏,影响抗震救灾工作。 1974年云南昭通地震,小缓线蒿子坝路段(250m长),由于山体发生了大规模滑坡,松散残积土堆集在路基上高达10m,造成严重交通中断,影响抗震救灾。有的村庄不得不动用直升飞机。1966年唐山大地震,
Our country is a multi-earthquake country. In just 11 years from 1966 to 1976, there were more than 90 earthquakes of magnitude 6 or above and 15 above magnitude 7 (the intensity of the epicenter was above 9 degrees and above 9 degrees). Each major earthquake caused property damage and casualties. Highway engineering has been damaged to varying degrees, affecting earthquake relief work. In 1974, the Zhaotong earthquake in Yunnan Province and the section of Artemisia dam in Xiaojian Line (250m long) caused large-scale landslides. Loose residual soils accumulated on subgrade up to 10m, resulting in serious traffic disruption and affecting earthquake relief. Some villages had to use helicopters. Tangshan earthquake in 1966,