Prediction Of Surface Settlement Caused By Tunnel Mine Method Construction Under Main Geological Conditions In Urumqi

In order to solve many urban problems and improve people's living conditions,the construction of underground rail transit project came into being.In the construction of underground rail transit project,due to the existence of many influencing factors,with the occurrence of high-risk and safety accidents,in order to reduce the high-risk in the construction process,it is urgent to predict and effectively control the surface subsidence during the construction of underground rail transit project.Firstly,based on the statistical method of mathematical induction,the relevant geological data of Urumqi Line 1 are collected and sorted out,and the three main geological zones of Urumqi are obtained.Secondly,based on the numerical simulation software,the sensitivity analysis of the influencing factors of surface subsidence is carried out by using the orthogonal experiment.Finally,based on the Peck empirical formula,the data processing is carried out by applying the method of mathematical linear regression.(1)The geology of Urumqi is divided into three main geological zones: the earth-rock composite strata,the rock composite strata and the pebble strata.(2)The sensitivity of different factors affecting surface subsidence,i.e.elastic modulus > internal friction angle > cohesion > poisson's ratio,is obtained.(3)The range of parameters of maximum subsidence correction and width coefficient of subsidence trough are obtained under three main geological conditions :?(0.921,1.2772)and ?(0.8596,0.9301);rock composite :? is(0.8183,1.1644)and ? is(0.857,1.3792);pebble :? is(0.602,1.1731)and ? is(0.9289,1.1904).(4)It is proved by engineering examples that the surface subsidence can be predicted well when the parameters are selected within the suggested range of modified parameters,and three specific control measures of surface subsidence are put forward according to the main geological conditions of Urumqi.Through the discussion of the above contents,we can effectively predict and control the surface subsidence characteristics under the main geological zoning conditions of Urumqi,and provide guidance and reference value for the subsequent subway construction.