{"id":35136,"date":"2020-10-05T06:54:15","date_gmt":"2020-10-05T06:54:15","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=35136"},"modified":"2020-10-05T06:54:15","modified_gmt":"2020-10-05T06:54:15","slug":"jimie-landslide-1","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2020\/10\/05\/jimie-landslide-1\/","title":{"rendered":"The Jimei landslide: inducing reactivation of an ancient failure through tunneling"},"content":{"rendered":"

The Jimei landslide: inducing reactivation of an ancient failure through tunneling<\/h4>\n

It is well-established that poorly planned or inappropriate tunneling can induce landslides.\u00a0 This is particularly the case when the tunnel penetrates an ancient landslide, which most frequently occurs because the features of the existing but dormant mass movement were not identified at the ground investigation stage.\u00a0 Once movement is initiated it is difficult and expensive to re-establish stability.<\/p>\n

In a new paper in the Arabian Journal of Geosciences<\/em><\/a>, Wang et al.<\/em> (2020)<\/a> describe the impact of a twin bore tunnel on an ancient landslide in Gulin County in Sichuan Province, China.\u00a0 The tunnels were bored as part of a highway construction project.\u00a0 They penetrated the two lobes of the ancient Jimie landslide, which was reactivated as a consequence.<\/p>\n

The image below, from Google Earth, shows the site, located at 28.059, 105.676.\u00a0 The image is from 2019, so post-dates the mitigation of the problems.<\/p>\n

\"The

Google Earth image of the aftermath of the Jimie landslide reactivation in China<\/p><\/div>\n

.<\/p>\n

The paper suggests that these features were identified as landslides prior to construction, and that the aim had been to locate the tunnels in bedrock below the shear surface.\u00a0 However, the tunnel appears to have penetrated the landslide mass, inducing reactivation, which caused serious deformation in one of the tunnels.\u00a0 Note that, as the image above shows, the landslide is occupied by houses and a school, so reactivation has significant implications.<\/p>\n

Wang et al.<\/em> (2020)<\/a> provide the following cross-section in the paper.\u00a0 This is a large slope failure – 11 million cubic metres in volume and up to about 73 m in depth:<\/p>\n

\"Jimie

Cross-sections through the Jimie landslide, provided by Wang et al.<\/em> (2020)<\/a>. Note the location of the tunnels.<\/p><\/div>\n

.<\/p>\n

The paper goes on to simulate the effects of mitigating the landslide through removal of a portion of the upper part of the landslide to reduce the driving force.\u00a0 The paper simulates the excavation of 1.3 million cubic metres.<\/p>\n

Perhaps surprisingly the paper does not really describe what was actually undertaken at this site, but the Google Earth image appears to show that a substantial portion of the landslide was removed.\u00a0 The 2019 Google Earth image shows traffic on the road, so it appears that the mitigation was successful.<\/p>\n

.<\/h4>\n

Quickslide 1: the impact of landslides in India<\/h4>\n

The Wire Science has an interesting piece on the impact of landslides in India<\/a>.<\/p>\n

.<\/p>\n

Quickslide 2: Landslides and floods in France, Italy, Switzerland and the UK<\/h4>\n

Storm Alex brought heavy rainfall across a swathe of Europe at the weekend.\u00a0 Worst affected were Italy and France<\/a>, but landslides were also reported in the UK<\/a> and in Switzerland.<\/p>\n

 <\/p>\n

.<\/p>\n

Reference<\/h4>\n

Wang, Z.F., Shi, F.G., Li, D.D. et al.<\/i> 2020. Tunneling-induced deep-seated landslides: a case study in Gulin County, Sichuan, China<\/a>. Arabian Journal of Geosciences<\/i> 13, <\/b>1039. https:\/\/doi.org\/10.1007\/s12517-020-06048-5<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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