Preliminary Field Assessment of Sinkhole Damage in, Pokhara, Nepal-猫眼课题宝

DOI：

10.4417/ijgch-03-02-04

发表时间：

2015-12

期刊：

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

R. Pokhrel;T. Kiyota;R. Kuwano;G. Chiaro;T. Katagiri;Itsuro Arai

自2013年11月以来，尼泊尔中部博卡拉山谷的阿尔马拉地区不断形成大量天坑，对当地居民构成严重威胁。为了提供旨在减少天坑风险的措施，调查天坑的原因和特征是至关重要的。本文介绍了基于2014年6月和2014年11月在Armala地区进行的两次损坏调查的早期研究结果。对比两次调查中拍摄的照片，不仅清楚地表明了新天坑的形成，而且还表明了已填充天坑的重新激活。通过动态静力锥贯入试验和表面波法调查，获得了土壤剖面的定性表征，并可以确定被认为是未来天坑的位置的浅软弱土层。根据现场调查结果，确定了Armala地区可能的天坑形成机制。此外，还报告了2015年5月初（2015年4月25日尼泊尔廓尔喀地震发生后）在阿尔马拉地区进行的勘测结果。虽然震中距离博卡拉比遭受严重破坏的加德满都近，但在天坑受损地区没有观察到地震的重大明显影响。

Since November 2013, numerous sinkholes have been forming in the Armala area of Pokhara Valley, Central Nepal, posing serious threat to local residents. In order to provide measures aimed at reducing sinkhole risk, investigations into the cause and features of the sinkholes are crucial. This paper presents early research results based on two damage surveys conducted in June 2014 and November 2014 in the Armala area. Comparison of photos, taken in the two surveys, clearly indicates not only the formation of new sinkholes, but also the re-activation of filled sinkholes. By means of dynamic cone penetration tests and surface wave method investigations, qualitative characterization of the soil profile was attained, and shallow weak soil layers which are believed to be the location for future sinkholes could be identified. On the basis of the field investigation results, possible sinkhole formation mechanisms are identified for the Armala area. Furthermore, results of a reconnaissance survey conducted in the Armala area in early May 2015 (following the 2015 Gorkha Nepal Earthquake, which occurred on April 25th) are also reported. Although the epicentral distance to Pokhara was closer than Kathmandu, which suffered from severe damage, no major apparent effects of the earthquake were observed in the sinkhole damaged area.

Preliminary Field Assessment of Sinkhole Damage in, Pokhara, Nepal

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