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1996年2月3日,云南省丽江县城以北40km发生7级强烈地震,这次地震在约12000km2范围内诱发了至少420处中小型崩塌和30处大中型滑坡,造成房屋倒塌、桥梁毁坏和公路堵塞。调查研究得出以下结论:(1)地震触发的崩塌滑坡分布在Ⅵ度区内,主要集中在主震震中东南部,接近表层构造断裂带和余震活动范围内;(2)崩塌主要发生在高陡斜坡的峡谷地带,滑坡多为复活型,部分为同发型和滞后型滑坡;(3)地形是控制崩塌滑坡分布位置的主导因素,崩塌多发生于大于60度斜坡中上部,滑坡发育于中缓斜坡(25°~45°);(4)滑坡影响区如遇充足的降雨可能进一步变形破坏,大量地裂隙孕育着新的崩塌滑坡,潜在危险性大。
On February 3, 1996, a magnitude 7 earthquake struck 40 km north of Lijiang County, Yunnan Province. This earthquake triggered at least 420 small and medium-sized landslides and 30 large and medium-sized landslides in the range of 12000 km2, causing the collapse of houses and the destruction of bridges The road is blocked. The following conclusions are drawn from the investigation and study: (1) Collapse landslides triggered by the earthquake are distributed in the VI degree area, mainly concentrated in the southeastern part of the epicenter epicenters, close to the surface structural faults and aftershock activity range; (2) In the gorge area with steep slopes, most of the landslides are of the resurrection type and partly of the same type and lag type landslides. (3) Topography is the dominant factor controlling the distribution of landslides. Collapsing occurs mostly in the upper and middle slopes of more than 60 degrees, (25 ° ~ 45 °); (4) Landslide affected areas may undergo further deformation and failure in case of adequate rainfall and a large number of ground fissures breed new landslides with high potential dangers.