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以广西某高速公路膨胀围岩隧道工程为背景,通过试验得出含水率为14.8%、20.1%、26.2%时膨胀围岩的抗剪强度和弹性模量,并使用Ansys有限元软件,分别对全断面开挖法、CD法、台阶法和双侧壁导坑法4种常用的施工方法进行模拟。结果表明:膨胀围岩的抗剪强度和弹性模量随含水率的增加而减小;4种不同施工方法下,围岩的应力应变、支护的弯矩与轴力、锚杆的轴力都随含水率不同而发生了变化,特别是围岩含水率从20.1%增加到26.2%时变化显著。
Taking the expansive surrounding rock tunnel project of a highway in Guangxi as a background, the shear strength and elastic modulus of the expansive surrounding rock with moisture content of 14.8%, 20.1% and 26.2% are obtained through experiments. The Ansys finite element software Full-face excavation method, CD method, step method and double-side wall guide method are four commonly used construction methods to simulate. The results show that the shear strength and elastic modulus of expansive surrounding rock decrease with the increase of moisture content. Under four different construction methods, the stress and strain of surrounding rock, moment and axial force of support, axial force of bolt All changed with the different water content, especially when the moisture content of surrounding rock increased from 20.1% to 26.2%.