基于ANSYS确定小净距隧道合理净距的数值模拟

随着小净距隧道在工程实际中的应用,小净距隧道合理净距的确定成为工程所要解决的首要问题,应用二维弹塑性有限元方法,针对丹东大荒沟隧道的工程实例,对不同净距下小净距隧道围岩的位移、应力、塑性区进行模拟分析,并应用有限元强度折减法确定出不同净距下隧道的安全系数,最后通过隧道中心岩柱的塑性区是否贯通和安全系数的突变来确定小净距隧道的合理净距。

Numerical Simulation of Determing Rational Clearance of Tunnel with Minor Clearance,Based on ANSYS

With application of tunnel with minor clearance in actual engineering,the determination of rational clearance of tunnel with minor clearance becomes already the first issue to need settling in engineering.By two dimensional elasticoplastic finite element method aiming at example of Dandong Dahuanggou Tunnel engineering,the paper simulates and analyzes the displacement,stress and palstic zone of surrounding rock of tunnel with minor clearance under different clearances and applies the strength reduction method to determine safety coefficient of tunnel under different clearances.Lastely,it determines a rational clearance of tunnel with minor clearance in terms of if the plastic zone of central rock of tunnel goes across and the safety coefficient is catastrophic.