›› 2011, Vol. 32 ›› Issue (6): 1757-1766.

• Geotechnical Engineering • Previous Articles     Next Articles

Risk assessment of water or mud inrush of karst tunnels based on analytic hierarchy process

XU Zhen-hao1, LI Shu-cai1, LI Li-ping1, HOU Jian-gang2, SUI Bin1, SHI Shao-shuai1   

  1. 1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China; 2. Bridge & Tunnel Co., Ltd., China First Highway Engineering Co., Ltd., Gaobeidian, Hebei 074000, China
  • Received:2010-06-08 Online:2011-06-10 Published:2011-06-21

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Abstract: In order to control the construction risk of karst tunnels, through statistical and theoretical analyses of relevant engineering projects, controlling factors and factors’ weight of water or mud inrush risks of karst tunnels are studied based on analytic hierarchy process; and a three-stage risk assessment and management method is proposed for the evaluation and controlling of construction risk of karst tunnels. Factors’ weight analysis results show that unfavorable geology, geological prediction, formation lithology and groundwater level are the main control ingredients of water or mud inrush risk. Macroscopic geological precursory information, monitoring measurement, contact zones of dissolvable and insoluble rock, geographic and geomorphic conditions, tunnel excavation and supporting are the minor significant factors; microcosmic precursory information, attitude of rock formation, layer and interlayer fissures, surrounding rock mass classification are the least important elements. The three-stage risk assessment method includes preliminary, secondary and dynamic assessment of water or mud inrush risk. Preliminary assessment is the evaluation of risk surroundings (karst hydrogeological and engineering geological conditions), and it is carried out for the estimation of risk before the enactment of the construction program. Secondary assessment is the evaluation of risk surroundings and risk factors (construction factors), and it is actualized for the appraisal of construction organization plan pre construction. Dynamic assessment is the evaluation of risk surroundings, risk factors and feedback information of risk management; and it is brought into operation for dynamic risk assessment and management. The three-stage risk evaluation and controlling process can be instantly, effectively, and accurately used for the management of construction risk of karst tunnels, and to realize dynamically amending and governing of risk. The research results are successfully applied to Jigongling Tunnel on the line of Fanba Expressway; and it is of consultant significance for similar engineerings.

Key words: analytic hierarchy process, karst tunnel, risk of water or mud inrush, factors&rsquo, weight, three-stage assessment

CLC Number: 

  • U45
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