Tunnel Lining Dynamic Response Analysis

With the economic development of modern society, the continuous expansion of city size, urban population has also increased dramatically, giving the city to bring unprecedented pressure on ground transportation, the problem is also increasingly becoming an important factor restricting urban development.To solve this problem, many countries and regions have been or are being vigorously construction of underground transportation facilities, subway tunnel is the main form.After nearly half a century of development, underground tunnels and underground structures and the construction of the concrete form of the growing number of tunnels in the suffering of the earthquake the earthquake resistance capacity of more and more attention. In this paper, the city subway tunnel for the study, made the following research work. Brief description of the damage at home and abroad tunnel instance, damage mechanism, the main method of seismic research and national studies on the seismic performance of the movements of the tunnel; Tianjin Metro Line 1,2 engineering background, the use of ANSYS software in the calculation of transient dynamic analysis tools made the following three aspects of the seismic analysis:â‘ calculate the tunnel lining using different materials (concrete, steel fiber reinforced concrete and plain concrete), the lining of the internal forces and displacements;â‘¡calculated using different thickness of the tunnel (0.35m and 0.45m) when the lining of the internal forces and displacements;â‘¢calculated the shock absorber placed between the lining and surrounding rock layer lining the internal forces and displacements. And three cases to compare seismic performance lining. The results show that: Lining material is reinforced concrete and steel fiber reinforced concrete is the better; Maximum horizontal displacement occurred in the inverted arch, the maximum vertical displacement occurred in the crown. Horizontal displacement and vertical displacement compared with the difference between the larger, the gap between the number of more than one, it should be in the seismic design basis for the horizontal displacement as the control; Significantly reduced damping layer lining the internal forces. However, the increase in displacement, according to the formula shows that the stiffness: the stiffness of displacement increases during the reduced system, which is strong aseismic to improve the seismic performance of the lining. These conclusions, relevant personnel of the tunnel for seismic design, construction and seismic analysis for reference.