摘要
为了研究动力扰动下不同作用形式、幅值大小和作用时长以及侧压力系数和衬砌厚度的改变对隧道开挖过程中围岩变形、受力及塑性区变化的影响情况,利用有限元软件ABAQUS的Dynamic Implicit模块对隧道模型受到正弦波、折线波以及梯形波分别作用下围岩的动力响应进行模拟,并通过改变幅值大小、作用时长参数进行对比分析,从而得到分步开挖过程中不同参数动力扰动对隧道稳定性的影响。研究结果表明:幅值增大、作用时长增加,应力以及位移均会明显增加,与动力扰动波形式无关;侧压力系数的提升对隧道围岩受力方式影响很大,不同侧压力系数作用下,围岩破坏方式不同;随着衬砌厚度增加产生的应力会相对减小,将会提高隧道的稳定性。
In order to study the deformation, stress and plastic zone of surrounding rock during tunnel excavation under dynamic disturbance with the influence of different action forms, amplitude, action duration, lateral pressure coefficient and lining thickness, the dynamic response of surrounding rock of tunnel was simulated respectively using the Dynamic Implicit Modular of finite element software ABAQUS under the action of sine wave, line wave and trapezoidal wave. The effect on the stability of the tunnel with different parameters was obtained by changing the parameters of amplitude size, action duration in the process of dynamic step-by-step excavation disturbance. The results show that the stress and displacement increase obviously with the increase of amplitude and duration, which is independent of the form of dynamic disturbance wave. The increase of lateral pressure coefficient has great influence on the stress mode of surrounding rock, and the failure mode of surrounding rock is different under different lateral pressure coefficient. The stress will be relatively reduced with the increase of lining thickness, which will improve the stability of the tunnel.
作者
张宝永
ZHANG Baoyong(China Railway 19th Bureau Group Co.Ltd.,Beijing 100176,China)
出处
《铁道建筑技术》
2021年第12期26-30,共5页
Railway Construction Technology
基金
中铁十九局集团有限公司科研项目(17-4A)。
关键词
分步开挖
动力扰动
数值模拟
塑性区
侧压力系数
step-by-step excavation
dynamic disturbance
numerical simulation
plastic zone
lateral pressure coefficient
