Construction Monitoring And Numerical Simulation Analysis Of Sinking In Super-deep Caisson

Because of its characteristics of not having to excavate large-area,small floor space and convenient construction,Shenjing has a wide range of applications in the municipal transportation field,especially the pipe jacking tunnel project.With the development of the city and the needs of large-scale projects,the sinking well gradually develops toward the large depth and large diameter.On the other hand,from the single sinking well in the past,the double sinking well,the triple sinking well and even the sinking in the near distance The direction of the well development.However,at this stage,the distribution law of the wall friction resistance of the ultra-deep well sinking stage is relatively rare.How to control the interaction between the double sinking well and the sinking well is relatively rare.Based on an actual water-sinking project,this paper focuses on the complex distribution of frictional resistance during the construction of adjacent ultra-deep double-sinking wells in the background engineering,and the difficulty of mutual interference and sinking between sinking wells.The analysis software analyzes the data and combines with the actual monitoring data on the site to analyze the distribution of frictional resistance between the borehole wall and the soil during the sinking phase of the double sinking well and the interaction between the sinking wells.The corresponding construction control method.The study mainly got the following conclusions:1.When the sinking well sinks synchronously,the cement-soil partition wall between the two sinking wells has little effect on the frictional resistance between the sinking well wall and the soil.If the non-synchronous sinking construction is adopted and the cement soil plus solid is used as the partition wall,the first sinking well will have different degrees of squeezing effect on the surrounding soil,which will increase the friction resistance of the rear sinking well wall by about 1/10.On the other hand,under the condition that the cement-soil partition wall is not adopted,and the construction sequence of the two sinking wells adopts the asynchronous sinking,due to the squeeze effect of the first sinking well,the rear sinking well wall and the soil body The frictional resistance will be reduced by approximately 1/10.2.When the two sinking wells sink synchronously,the degree of influence of the sinking well on the surrounding soil at different locations is different,so that the two sinking wells tend to be opposite to each other.When the two sinking wells are not synchronously sinking,the sinking well will have a tendency to deflect toward the back sinking well due to the existence of the partition wall,and the rear sinking well will increase this trend when sinking.3.For the construction of the ultra-deep double sinking sinking,it is advisable to set up the cement-soil partition wall between the two sinking wells and adopt the synchronous sinking construction scheme to control the mutual influence between the sinking wells;the actual construction stage can adopt the measures of alternate sinking.First,the sinking well first sinks 10 m,then let the sinking sink sink 10 m,then sink first and sink the well,so alternate until the sinking sink is completed to control the interaction between the sinkholes.