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.

中文翻译：

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交叉口角度对公用工程隧道破坏机理的影响

在地质灾害地区规划公用事业隧道网络引起了严重的关注，特别是在地面裂缝发达城市中建造的公用事业隧道。当公用事业隧道越过地面裂缝时已采取了许多预防和控制措施，例如在规划公用事业隧道时找到正确的相交角。为了研究相交角对公共工程隧道穿越地面裂缝的影响，本文通过数值模拟方法比较了相交角对公共工程隧道穿越地面裂缝的影响。由于实际隧道与地面裂缝的交角是变化的，为了使模型的应力-应变关系更加逼真，建立了钢筋应力-应变关系的三线性模型，将公用隧道和土壤的材料特性分别指定为混凝土破坏的可塑性和莫尔-库仑的可塑性。仿真结果表明，实用隧道的轴向拉应力和竖向剪应力随着交叉角的增大而增大，但实用隧道在水平方向的位移和剪应力随交叉角的减小而增大。公用工程隧道与地面裂缝相交角的变化不能显着降低公用工程隧道的破坏。公用事业隧道的垂直位移不随交叉角而变化。最后，