Reconnaissance report on geotechnical and structural damage caused by the 2015 Gorkha Earthquake, Nepal
Reconnaissance report on geotechnical and structural damage caused by the 2015 Gorkha Earthquake, Nepal
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DOI：
10.1016/j.sandf.2015.09.006
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发表时间：
2015-10
影响因子：
3.7
通讯作者：
G. Chiaro;T. Kiyota;R. Pokhrel;K. Goda;T. Katagiri;K. Sharma
中科院分区：
文献类型：
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作者：
G. Chiaro;T. Kiyota;R. Pokhrel;K. Goda;T. Katagiri;K. Sharma
2015年4月25日，尼泊尔廓尔喀地区发生里氏7.8级地震。主震之后又发生了两次大的余震（Mw6.6和Mw6.7），造成加德满都北部山区许多村庄的破坏。本报告总结了地震引起的岩土和结构破坏特征，这些特征是由日本岩土学会（JGS）、ISSMGE岩土自然灾害亚洲技术委员会（ATC 3）和日本土木工程师协会（JSCE）派出的调查小组进行现场调查期间观察到的。2015年5月1日至6日，在加德满都、特里舒利、梅兰奇、巴卢瓦（震中地区）和博卡拉进行了震后损失调查。据观察，加德满都市中心杜巴广场的历史建筑受到严重破坏，而周围地区的砖石结构受到的破坏有限。在包括震中地区在内的山区，非工程砌体结构遭到严重破坏，经常观察到中大型滑坡和罗克瀑布的痕迹。Trishuli的堤坝在水库一侧沿着其整个长度出现裂缝。这些建筑物及斜坡的损毁，对当地居民构成次生灾害的风险。在此基础上，本文最后提出了震后应急决策建议。
On 25 April 2015, a moment magnitude (Mw) 7.8 earthquake struck the Gorkha District of Nepal. Two major aftershocks (Mw6.6 andMw6.7) followed the mainshock contributing to devastation in many villages in mountainous areas north of Kathmandu. This report summarizes geotechnical and structural damage features caused by the earthquake, which were observed during a field investigation conducted by a survey team dispatched by the Japan Geotechnical Society (JGS), the Asian Technical Committee of ISSMGE on Geotechnical Natural Hazards (ATC3) and the Japan Society of Civil Engineers (JSCE). The post-earthquake damage survey was conducted in Kathmandu, Trishuli, Melamchi, Baluwa (epicentral area) and Pokhara from 1 to 6 May 2015. A significant damage to the historical architectures in the Durbar Square of Downtown Kathmandu was observed, while the damage to masonry structures in the surrounding area was limited. In mountainous areas including epicentral area, non-engineered masonry structures were severely damaged, and traces of medium to large scale landslides and rock falls were frequently observed. Dam embankment in Trishuli suffered from cracking at the reservoir side along its entire length. Such damages to the structures and slopes are posing risks of secondary disasters to the local residents. Based on the field survey, recommendations related to immediate policy following the earthquake and addressed to policy makers are made in the conclusion.