论文部分内容阅读
隧道开挖后需依据岩体的变形特性对隧道围岩进行合理分区。针对隧道围岩弹塑性临界变形时强度逐渐降低的特性,结合非轴对称荷载作用的模型特点,选用俞茂宏双剪统一强度理论中双剪三参数准则,采用半逆解法,侧压力系数在[1/3,1)区间取值,推导出圆形隧道在非轴对称荷载作用下弹性围岩区应力分布解析解。实例分析表明,考虑了地应力非轴对称分布的力学模型可很好地反映围岩变形特点,所选强度理论符合岩体材料自身特殊的强度特征,其解析思路更贴近围岩的实际状态,对围岩支护设计具有现实指导意义。
Tunnel excavation should be based on the deformation characteristics of rock mass surrounding rock tunnel reasonable partition. In view of the characteristics of the tunnel surrounding rock elastic strength reduction gradually reduced, combined with the characteristics of non-axisymmetric load model, Yu Maohong double shear unified strength theory double shear three parameters criterion, the use of semi-inverse solution, lateral pressure coefficient [ 1 / 3,1) interval, the analytical solution of stress distribution in elastic surrounding rock area under circular axisymmetric load is derived. The case study shows that the mechanical model considering the non-axisymmetric stress distribution can well reflect the deformation characteristics of surrounding rock. The selected strength theory is in line with the special strength characteristics of rock mass materials. The analytical thinking is closer to the actual state of surrounding rock, It has the realistic guiding significance to the design of surrounding rock support.