Contributing factors to the failure of an unusually large landslide triggered by the 2014 Ludian, Yunnan, China, Ms=6.5 earthquake
Contributing factors to the failure of an unusually large landslide triggered by the 2014 Ludian, Yunnan, China, Ms=6.5 earthquake
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2014年中国云南省鲁甸Ms=6.5级地震引发特大滑坡失败的成因
DOI：
10.5194/nhess-16-497-2016
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Cui J.W.
中科院分区：
文献类型：
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作者：
Chang Z.F.;Chen X.L.;An X.W.;Cui J.W.
摘要。2014年8月3日，中国鲁甸，D6.5女士。地震造成了许多大的滑坡。最大的一次发生了。在震中附近的红石岩，有0.1.0107立方米的体积，并阻塞了牛栏江，造成了。一个大湖。事件发生后的实地调查得到了详细的结果。关于以下几个方面的资料：滑坡的岩石结构，。当地的岩性和几何区域周围。滑坡坝体和碎石的组成及粒度。雪崩。在此基础上，进行了地质分析。和红石岩地区的地形，并探讨。发生特大滑坡的原因。这个位置。我们的分析表明了以下情况。都要为这场灾难负责。(1)由于最近。地壳变形剧烈，对河流的切口增大。地形起伏，有陡峭的斜坡和峭壁。(2)的总和。结构，包括卸荷裂缝，高角度。沿河有节理和低角河床，以及一个上强。尤其是边坡上的下弱层间结构。边坡中软弱层的存在是重要的。导致这一重大失败的因素。(3)红石岩。位于活动断层附近，地壳剧烈变形。已造成岩石断裂和风化，而频繁的地震可能会逐渐降低其强度。斜率。(4)在6.5级地震期间，地形。这些因素的综合影响引发了一场非常大的地震。中等地震时的滑坡。
Abstract. The 3 August 2014 Ludian, China, Ms D6.5.earthquake caused many large landslides. The biggest occurred.at Hongshiyan near the epicenter, had a volume of.1.0107 m3 and dammed the Niulanjiang River, creating.a large lake. Post-event field investigations yielded detailed.data on the following aspects: rock structure of the landslide,.the local lithology and geometry of the area around the.landslide dam and composition and grain sizes of the debris.avalanche. Based on these data, this work analyzes the geology.and topography of the Hongshiyan area, and explores.reasons for the occurrence of an unusually large landslide at.this location. Our analysis suggests the following conditions.are responsible for this catastrophic event. (1) Due to recent.crustal deformation, intense incision on the river increased.topographic relief with steep slopes and scarps. (2) Combined.structures, including unloading fissures, high-angle.joints and low-angle beds along the river, as well as an upperstrong.and lower-weak interlayer structure on the slope, especially.the existence of weak layers in the slope, are important.factors that contribute to this large failure. (3) Hongshiyan.lies near an active fault, where intense crustal deformation.has resulted in rock fractures and weathering, and.frequent earthquakes may progressively reduce the strength.of the slope. (4) During the Ms D6.5 earthquake, the terrain.and site conditions led to abnormally strong ground shaking..The combined impacts of these factors triggered a very large.landslide during a moderate-sized earthquake.