Emergency Investigation of Extremely Large Sinkholes, Maohe, Guangxi, China

Lei, Mingtang; Gao, Yongli; Jiang, Xiaozhen; Guan, Zhende

doi:10.5038/9780979542275.1139

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…Cave roof collapse may trigger a "water hammer" effect in the karst conduits. The "water hammer" effect can cause severe soil damage and trigger subsequent collapses (Lei et al, 2010;Lei et al, 2013). Soil disturbance may change hydraulic gradient, which can cause water level fluctuations and eventually result in sinkhole collapses.…”

Section: Sinkhole Distributionmentioning

confidence: 99%

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Investigations of Large Scale Sinkhole Collapses, Laibin, Guangxi, China

Gao¹,

Luo²,

Jiang³

et al. 2013

Full Proceedings of the Thirteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of K

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Jili village is located in central Guangxi province, a highly active karst area containing many karst features such as sinkholes, springs, karst windows, caves, and conduit systems ( Figure 1).The study area is a typical fengcong and fenglin karst area with isolated and dissolved hills and valleys. The unconsolidated sediments above bedrock are Quaternary alluvium and colluvium. Quaternary deposits consist of silty clay, clay containing gravels, and clay. Karst bedrock units belong to the middle Carboniferous Huanglong Formation (C 2h ) and Nandan Formation (C 2n ). Rock types include thick light-gray limestone, gray fossiliferous limestone, dolomite limestone, siliceous and fossiliferous limestone, limestone containing gravels, AbstractA series of sinkholes collapsed at Jili village and Shanbei village, Laibin Guangxi, China in June 2010. A large underground stream exists in the north-south transect of the study area and passes the collapse site. Preliminary investigations revealed that extremely heavy rainfall between May 31 and June 1 2010 may have triggered this collapse event. The precipitation, as high as 469.8 mm within one day, was a record high in the study area. A long period of drought in 2009 followed by extremely heavy rainfall along with cave roof collapse may have caused the collapse event on June 3 2010. The "water hammer" effect and collapsetriggered earthquakes caused severe ground failure and fractures in residential houses and Jili Dam. Several collapse events were caused by extreme weather conditions in Guangxi over the past few years. Further studies of the relationship between extreme weather events and sinkhole collapses will help minimize the damage or impact to human infrastructure by avoiding areas susceptible to collapse or by designing infrastructure to better withstand subsidence.

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Section: Sinkhole Distributionmentioning

confidence: 99%

“…Karst water levels are recovering to normal conditions after the collapse event. It may take several years to Lei et al, 2013). Earthquakes and the "water hammer" effect may also have caused fractures in many houses and the Jili Dam (Figures 6 and 7).…”

Section: Sinkhole Distributionmentioning

confidence: 99%

Investigations of Large Scale Sinkhole Collapses, Laibin, Guangxi, China

Gao¹,

Luo²,

Jiang³

et al. 2013

Full Proceedings of the Thirteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of K

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“…Past studies of cover-collapse sinkholes indicate that collapsing events could be triggered by deformations of Quaternary sediments Lei et al 2013). Therefore, seepage deformations and rates of karst water level changes are important proxies of possible soil void development Lei et al 2010).…”

Section: Methodsmentioning

confidence: 99%

Potential Karst Collapse Assessment Along a Bridge Foundation of High-Speed Rail, Anshan, China

Jiang¹,

Lei²,

Gao

2014

Engineering Geology for Society and Territory - Volume 5

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Mingjiashan Bridge is constructed along the high-speed rail (HSR) connecting two metropolitan cities, Harbin and Dalian, northeastern China. Sixty two cores were drilled into limestone bedrock. Caves occurred in 8 cores and soil voids appeared in 6 cores. Quaternary sediments on top of the bedrock are loose alluvial and fluvial deposits with a thickness of more than 50 m, which were categorized into three sections (A, B, and C) based on sediment types and structures. Daily water level fluctuations were 33, 20, and 10 cm in sections A, B, and C respectively. Maximum groundwater declining rates were 0.87, 2.0, and 0.26 cm/min in sections A, B, and C respectively. Seepage deformation experiments demonstrate that threshold hydraulic gradients causing deformation are 1.59, 2.38, and 0.79 in sections A, B, and C respectively. Results from hydrogeological and geotechnical investigations indicate that potential karst collapses may form in section A. Socketed piles should be used in this section and friction piles can be used in other sections. Existing voids and cavities need to be treated with grouting to reduce potential risk of collapse events in the future.

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“…Subsidence sinkholes are known to occur worldwide (Hyatt and Jacobs 1996;Forth et al 1999;Bell and Genske 2001;Johnson 2005;Gao et al 2005;Van Den Eeckhaut et al 2007;Guerrero et al 2008;Parise et al 2009;Lei et al 2002;Lei 2013) and have been responsible for extensive damage to many structures in recent times (Kowalski 1991;Diederichs and Kaiser 1999;Liu et al 2000;Waltham 2002;Pine et al 2006;Parise 2010). The critical process in the formation of subsidence sinkholes is the growth, migration, and failure of soil cavities that generally initiate at the rock head, with soil being carried down into bedrock fissures.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the critical triggering condition of soil failure in subsidence sinkholes

et al. 2015

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Subsidence sinkholes in karst terrain are a common geological hazard, which can lead to natural disasters in the natural and built environment. Groundwater ingress is the main factor leading to subsidence. Previous research has focused on the qualitative analysis of the influence of groundwater, although limited research into critical triggering conditions of groundwater has been undertaken quantitatively. Water seepage into soil is the starting condition in the development of subsidence sinkholes. This paper focuses on testing the anti-permeability strength as the critical triggering condition in the formation of subsidence sinkholes, and develops a design and methodology to test its value quantitatively. The methodology is applied in an industrial park of Guilin, China, to assess the probability of forming subsidence sinkholes. Results indicate that there is a low susceptibility to the formation of subsidence sinkholes under current conditions in the ground-truth investigation.

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Emergency Investigation of Extremely Large Sinkholes, Maohe, Guangxi, China

Cited by 6 publications

References 4 publications

Investigations of Large Scale Sinkhole Collapses, Laibin, Guangxi, China

Investigations of Large Scale Sinkhole Collapses, Laibin, Guangxi, China

Potential Karst Collapse Assessment Along a Bridge Foundation of High-Speed Rail, Anshan, China

Experimental study on the critical triggering condition of soil failure in subsidence sinkholes

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