Deformation Analysis of Existing Operating Tunnel with Different Structural Forms Crossed by New Tunnel
Combined with a new mining tunnel in Beijing underpassing existing operating tunnels with different structural forms,based on the Peck theory correction formula and the measured deformation data,the fitting analysis method is used to fit the inversion analysis,and the deformation characteristics of the new tunnel under different structural forms of the existing operating tunnel are studied and analyzed.The results show that the structural deformation of the existing tunnel caused by the construction of the new tunnel is related to the structural form of the existing tunnel,and the variation law of vertical displacement is shield tunnel＞mining method＞mine arch tunnel.The upper step of new tunnel has great influences on the existing tunnel,single-line crossing presents a single slot,while double-line crossing presents a double slot,the two crossings have superimposed effects.Peck theory correction formula can fit the settlement of existing tunnels with different structural forms caused by the construction of new tunnels,the ground loss rate of the existing tunnel structure is 0.018%～0.079%,which is at a lower level in the range of natural stratum values.The width parameter of the settlement trough is 0.77～1.70,which is greater than the natural stratum value.By comparing the fitting parameters of the cumulative settlement curve of the existing tunnels with different structural forms,it can be found that the loss rate of the existing tunnel stratum during the crossing construction is inversely related to the stiffness of the existing tunnel structure,and the width parameter of the settlement trough is positively related to the stiffness of the existing tunnel structure.
NETL
NSTL
万方数据
