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GSA Annual Meeting in Indianapolis, Indiana, USA - 2018

Paper No. 182-10
Presentation Time: 9:00 AM-6:30 PM

THE GUSHING WATER HAZARD ASSESSMENT OF KARST TUNNEL IN THE PLATEAU OF EASTERN YUNNAN，CHINA


XU, Mo1, YANG, Yanna2, ZHANG, Qiang3 and ZHAO, Hongmei2, (1)State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu, 610059, China; College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, China, (2)College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, China, (3)College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu, 610059, China

The carbonate rock strata from Sinian system to Permian system are widely distributed in plateau of eastern Yunnan, with pure lithology, large area outcroping and abundant karst water resources, etc. We establishes an appropriate evaluation system, under the study of occurrence and migration regularity of karst water, and combining with the feature of water inrush disaster characteristics of the tunnels of Dagongshan and Dawushan in Niu lanjiang to Dianchi diversion project.

This paper selects the soluble rock(K1), geological structure(K2), the characteristics of surface environment(K3), the depth of tunnel(K4) four indicators as the first grade evaluation index, and rock component(K11), texture of rocks(K12), structure of rock mass(K21), strata dips(K22), rainfall infiltration coefficient (K31), terrain slope(K32) as the secondary evaluation index.

At first, this paper establishes the evaluation system by quantifying the selected indexes, and confirms the weight of each indicator by adopting the AHP. Then, the risk evaluation model of water bursting is built, which is.

THK=5*(0.45*K1+0.08*K2+0.15*K3+0.32*K4)

Finally, the risk evaluation system of karst tunnel water bursting in the plateau of eastern Yunnan is obtained, and the controlling measures are given.

Session No. 182--Booth# 173

D44. Karst Landforms and Processes (Posters)
Tuesday, 6 November 2018: 9:00 AM-6:30 PM
Halls J-K (Indiana Convention Center)
Geological Society of America Abstracts with Programs. Vol. 50, No. 6
doi: 10.1130/abs/2018AM-317902
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