Experimental Study on Mechanical Properties of Utility Tunnel with Different Manufacturing Processes after Exposure to Fire

摘要

In order to study the mechanical properties of utility tunnel with different manufacturing processes after exposure to fire, static load test was done to the cast-in-siteutility tunnel and precast utility tunnel. Combined with experimental phenomena, load-displacement curve and residual bearing capacity, the structural damage, failure mechanism and bearing capacity change rules were compared and analyzed. The test results show that bearing capacity of cast-in-siteutility tunnel is obviously better than the precast utility tunnel; the residual bearing capacity of the cast-in-siteutility tunnel is 1.49 times that of the precast utility tunnel; the failure model of utility tunnel is shear failure; the failure section is mainly concentrated at the axillary angle; two types of utility tunnel have strong security reserve capacity. All these results offer technical references for fire-resistant design of utility tunnel.