| With the rapid development of basic traffic construction,the construction of highway tunnel is also increasing day by day.Highway tunnels often need to cross the various types of topography,landscapes.In the event of a variety of unfavorable geological structures(such as faults,joints,cracks,etc.)and bad meteorological and hydrology conditions(such as heavy rain),it is very easy to occur the geological hazard of water gushing during the construction or operation of the tunnel.If tunnel water gushing is unsuitable and not thorough,it will seriously affect the structure quality and operation safety of tunnel structure.Therefore,it is very necessary to study the comprehensive treatment plan for geological disasters of tunnel water gushing in the limestone area.In this paper,take water gushing of YK153+092~YK153+152 section for Huling tunnel as the engineering background and comprehensive treatment plan of water gushing geology hazard is studied.Firstly,the bad geological structure and geological phenomenon,the recharge,runoff and discharge of surface water and ground water and water bearing rock group of tunnel site are analyzed deeply.It is concluded that the tunnel is located in the limestone area,the dissolved water in the bedrock fissure is the main source of tunnel water gushing and five kinds of water bearing rock groups which are the source of water gushing in the caverns have great influence on the water gushing of the caverns.Secondly,analyzes the causes of the Huling tunnel water gushing disaster according to the weather and hydrology of tunnel site,bedrock lithology and the working state of the tunnel drainage system,etc.Summarize the calculation methods of the tunnel water gushing volume.Discuss and summarize three main problems of calculation of the water gushing volume currently.Finally,according to the analysis of Huling tunnel water gushing situation,summarize and obtain three characteristics of the tunnel water gushing in limestone area during the rainstorm.In the light of the actual situation of water gushing,design and propose three kinds of comprehensive treatment plan.Based on the principle of comprehensive governance and complete radical cure and considering the difficulty degree of construction,construction operation cost,treatment effect and safety risk,determine the comprehensive treatment plan that combines local leakage of the surface,drain hole drainage and structure treatment through the comparison of economic and technology.The comprehensive treatment plan also has certain reference significance to similar tunnel water gushing disaster. |
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