Study of the 1920 Haiyuan earthquake-induced landslides in loess (China)
Study of the 1920 Haiyuan earthquake-induced landslides in loess (China)
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1920 年海原地震引发的黄土滑坡研究（中国）
DOI：
10.1016/j.enggeo.2007.07.007
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发表时间：
2007-10
影响因子：
7.4
通讯作者：
Wang, Gonghui
中科院分区：
文献类型：
--
作者：
Zhang, Dexuan;Wang, Gonghui
在黄土土中，地震引起的大规模滑坡已被多次报道。它们经常造成灾难，因为它们以高速长距离传播。为了阐明这些滑坡的机理，对海原地震引发的滑坡进行了实地调查，并对滑坡收集的黄土土进行了一系列环剪试验。现场调查结果表明，海原地震引发的黄土滑坡多发生在小于15°的凹坡上，坡面跳动距离长，等效摩擦角很小。饱和试件在不排水条件下的循环环剪试验表明，对疏松黄土试件施加循环剪切应力，破坏前孔隙压力逐渐积聚，破坏后由于黄土土体结构破坏迅速产生较大孔隙压力。同时，为探讨黄土滑坡高流动性的产生机理，在不排水条件下，对大剪切位移达数米的黄土试件进行环剪试验，发现初始正应力对黄土土体稳态表观摩擦角没有影响，超固结比对黄土土体稳态表观摩擦角影响很小。不同饱和度下的试验结果表明，土体抗剪强度的降低更可能是由于孔隙水压力的产生，而不是孔隙空气压力的产生。
Many large-scale landslides induced by earthquakes have been reported in loess soils. They often cause catastrophes because they travel long distances at high velocity. To clarify the mechanism of these landslides, field survey was performed on the landslides triggered by the Haiyuan Earthquake (China, 1920), and a series of ring shear tests was conducted on the loess soils collected from a landslide. The field surveys revealed that most of the loess landslides triggered by the Haiyuan Earthquake occurred on concave slopes gentler than 15° with long runout distance, showing very small equivalent friction angle. Cyclic ring shear tests on saturated specimens in the undrained condition showed that when cyclic shear stress was applied to a loose loess specimen, pore pressure was built-up gradually before the failure, and after that, large pore pressure was quickly generated due to the failure of loess soil structure. Meanwhile, to investigate the mechanism that produces the high mobility of loess landslides, ring shear tests were conducted on loess specimens with large shear displacement of up to several meters under the undrained condition, and it was found that the initial normal stress has no effects, and overconsolidation ratio has little if any effects, on the apparent friction angle in the steady state for loess soils. Results of tests on soils at different saturation degrees revealed that the reduction in shear strength results more likely from the generation of pore water pressure, not of pore air pressure.
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DOI：
--
发表时间：
1996
期刊：
--
影响因子：
--
作者：
K. Sassa
通讯作者：
K. Sassa
DOI：
10.1061/40860(192)13
发表时间：
2006-05
期刊：
--
影响因子：
--
作者：
G. Zeng;X. Meng
通讯作者：
G. Zeng;X. Meng
DOI：
10.1061/40802(189)82
发表时间：
2006-03
期刊：
--
影响因子：
--
作者：
R. Sharma;S. Singhal
通讯作者：
R. Sharma;S. Singhal
DOI：
--
发表时间：
1996-06
期刊：
Journal of Natural Disaster Science
影响因子：
--
作者：
Dexuan Zhang
通讯作者：
Dexuan Zhang
影响因子：
7.4
作者：
G. Kruse;T. Dijkstra;F. Schokking
通讯作者：
G. Kruse;T. Dijkstra;F. Schokking