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With the rapid construction of China 's subway , subway construction spread to the suburbs , new subway through the large railroad stocks Road , the the turnout area 's largest railway crossing project more and more . The turnout is one of the three weak links in the track structure , particularly busy railway transport tasks , many crossing construction , the railway sector requires the normal operation of the train , and zero crossing construction settlement demands . Beijing Metro Line 9 line abundance the East to FENGNAN shield tunnel beneath the Fengtai Railway Station project as the basis , the use of ABAQUS finite element analysis software , turnout - two-lane tunnel three-dimensional finite element static model , analyze Shield the different ways of tunnel excavation , the structural safety of turnout ( evaluation turnout structure deformation and turnout static geometry bit , including turnout settlement , lateral displacement of the rail , high and low , horizontal, triangular pit , rail - to - gauge) . Mainly from the following aspects were analyzed : (1) the left tunnel excavation , analysis of changes in turnout geometric bit , get the left tunnel excavation caused turnout geometry geometric curve ; (2 ) turnout asymmetric structure , the right lane tunnel excavation , comparative analysis of left and right lane tunnel excavation caused turnout for geometrical changes ; (3) On the left tunnel excavation on the basis of , the right lane tunnel open dig , analysis of the soil caused by for right lane tunnel excavation secondary disturbance turnout geometry bit ; (4) two-lane tunnel excavation simulation , analysis of turnout geometry bit ; ( 5 the ) Summary shield tunnel through the security control measures adopted by the turnout structure , and pre- foundation reinforcement, buckle rail reinforcement to change the strength of the synchronous grouting , verify the effectiveness of various security controls turnout geometry bit control .
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