Finite element analysis and construction monitoring of advance support for multi-arch tunnel based on soft soil layer
Based on the construction of a subway station in Jiangsu province,this paper studies the construction control of the advance support of the multi-arch tunnel passing through the soft soil layer,and puts forward the construction control method of the advance support of the multi-arch tunnel.Using MIDAS-GTS NX,a three-dimensional solid model of multi-arch transfer channel was established under two working conditions of original soil layer and full-section deep-hole grouting reinforcement,advance small conduit support,the settlement of the ground surface,the settlement of the arch crown and the influence on the approach bridge caused by the tunnel excavation are analyzed.The type of grouting fluid for the advance support of the double-arch tunnel was determined as the volume ratio of AC liquid and C liquid(sodium silicate liquid),and the ratio of sodium silicate to water was 0.6:0.4,and the initial pressure was 0.3～0.75 MPa,the end pressure was 0.5～1.0 MPa and the grouting volume per unit length was 0.283 m.The results show that the maximum value of ground settlement was 5.57 mm,which was less than 10 mm of the settlement control value required by the design,it can effectively improve the reinforcement effect of multi-arch tunnel.
multi-arch tunnelsoft soiladvance supportconstruction control
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