Study On The Wuhan Hanyang District Subway Shield Construction Monitoring And Analysis

Subways and other underground engineering,Ming(cover)excavation method,concealed excavation method,shield method,etc.,various methods have their advantages,disadvantages and suitable conditions and the shield method is to its many advantages to become more is used for the city subway tunnel construction method.How to reduce the construction on the surrounding soil disturbance degree,minimizing the construction influence on adjacent buildings and pipelines,as well as to how the affected building protection measures,has been the shield construction personnel issues of concern.The excavation parameters of shield method construction of tunnel and the relationship between the surface subsidences become an important research topic.This paper,taking Wuhan subway shield tunnel as the specific research object,Hanyang railway station in Wuhan-five piers-seven temple in the interval of shield construction process of monitoring and analysis,the subway shield tunnel during the construction of ground surface subsidence caused by a number of problems are studied.Has achieved the following results:(1)During the shield out of the hole,because of all kinds of construction parameters of shield machine in the debugging stage,so the shield machine is out of the hole after the surface settlement is generally out of reinforcement area.Debugging to normal,with all kinds of construction parameters of shield machine during normal advance surface subsidence is generally small.(2)During shield advance,corresponds to the position of shield machine construction on the center axis of agitation of soil is the largest,the corresponding position of the center of the earth's surface settlement,the biggest center axis extends outward effects on both sides became smaller.The settlement of this shield engineering work area layout measurement section reflects the point.(3)During the shield advance,the whole surface will have obvious settlement,after the shield machine through,the surface will slow down,until stable.(4)Due to the proper construction control,the shield machine is advancing,the surrounding houses without large settlement.A small number of low rise buildings will appear floating situation.(5)On the whole,the change trend of the pipeline monitoring points is the same as the ground surface monitoring point,that is,the shield machine to advance to the pipeline monitoring point,the pipeline point has a certain float,but after the sinking trend.