Abstract
Planning utility tunnel network in the area with geological disasters poses serious concerns, especial for the utility tunnel built in the ground fissures developed cities. Many prevention and control measures have been taken when the utility tunnel crossed the ground fissures, such as finding the right intersection angle when planning the utility tunnel. In order to study the effect of intersection angle for utility tunnel when crossing ground fissures, this paper compares outcomes when the utility tunnel crosses ground fissures with different intersection angle through numerical simulation method. Because actually the intersection angle of utility tunnel and ground fissures is varied, in order to make stress‐strain relationship of the model more realistic, a trilinear mode of reinforcing bar stress‐strain relationship was established, and the material property of utility tunnel and soil were assigned to concrete damaged plasticity and Mohr‐Coulomb plasticity, respectively. The simulation result shows that the axial tension stress and vertical shear stress of utility tunnel are increased with the increasing of intersection angle, but displacement and shear stress of utility tunnel in horizontal direction are increased with the decreasing of intersection angle. The variation of intersection angle of utility tunnel and ground fissures cannot significantly reduce the damage of utility tunnel. The vertical displacement of utility tunnel does not vary with intersection angle. Finally, this paper suggests that the strengthening length of utility tunnel should not be less than 50 meters (10 times the height of utility tunnel) on both sides of the ground fissures no matter the variation of intersection angle.
Highlights
A utility tunnel is a lifeline passage of the city built underground or above ground to carry utility lines such as electricity, steam, water supply pipes, and sewer pipes (Figure 1). e construction of utility tunnel has a history of more than a century in developed countries
Many scholars have solved engineering problems by using numerical analysis method due to its advantages of high efficiency, high accuracy, and low cost [18,19,20,21]. Because this method is not limited by the experimental funds and size of test model when carrying out so many researches, the study can optimize the design of utility tunnels built in ground fissures area
According to the analysis of the result, it is indicated that when planning the network of utility tunnel, it is useless to consider the variation of intersection angle to minimize vertical displacement
Summary
A utility tunnel is a lifeline passage of the city built underground or above ground to carry utility lines such as electricity, steam, water supply pipes, and sewer pipes (Figure 1). e construction of utility tunnel has a history of more than a century in developed countries. Many scholars have solved engineering problems by using numerical analysis method due to its advantages of high efficiency, high accuracy, and low cost [18,19,20,21] Because this method is not limited by the experimental funds and size of test model when carrying out so many researches, the study can optimize the design of utility tunnels built in ground fissures area. 2. Numerical Methodology is study simulated the failure mechanism of utility tunnel crossing ground fissures with different intersection angle through finite element software of ABAQUS. In order to make stressstrain relationship of the model more realistic, a trilinear mode of reinforcing bar stress-strain relationship was established, and the material properties of utility tunnel and soil were assigned to concrete damaged plasticity and MohrCoulomb plasticity, respectively. Assemble result is shown in Figure 4. en the interaction properties of hanging wall and foot wall, hanging wall and utility tunnel, and foot wall and utility tunnel were created singly. e intersection between soil and utility tunnel was simulated through the creation of contact property between soil and utility. e contact properties include tangential behavior and normal behavior. e fraction coefficient of soil contacting concrete is 0.7, while that of soil contacting soil is 0.3
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