为快捷高效地获得隧道轴线地应力，满足工程实际使用需求，构建一种基于地质统计克里金法的深埋长隧道初始地应力插值计算方法。首先，采用交叉验证迭代计算出各误差指标，在3种变异函数模型中选出最优函数模型用于地应力插值计算，获得隧道剖面的主应力量值及最大水平主应力方向； 然后，考虑不同地层和断层的影响，对隧道洞轴线主应力结果进行修正，获得隧道洞轴线主应力量值及最大水平主应力方向。该方法以少量的地应力实测数据为基础，不受隧道勘察资料和工程线路方案调整等影响，可快捷高效地获得隧道轴线地应力量值及方向。通过工程应用表明： 1）该方法的计算值与实测地应力值拟合精度较高，其中最大水平主应力拟合度约85％； 2）通过插值计算获得了隧道洞轴线主应力量值及最大水平主应力方向，隧道最大水平主应力达52.50
MPa，隧道主应力方位以NW向为主，局部段为NE向。
To quickly and efficiently obtain the insitu
stress of the tunnel axis to meet the practical engineering demands, an initial
insitu stress interpolation calculation method for a
deepburied long tunnel is established based on the
geological statistical Kriging method. The crossvalidation
iteration is used to calculate each error indicator. The optimal function model
is selected from various variogram models for geostress interpolation
calculation to obtain the principal stress value and maximum horizontal
principal stress direction of the tunnel section. Next, considering the
influence of different strata and faults, the principal stress results of the
tunnel axis are corrected to obtain the principal stress value and tunnel axis
direction. The proposed method, based on a small amount of insitu stress measurement data, is not affected by tunnel survey data
and engineering route plan adjustments, resulting in quickly and efficiently
obtaining insitu stress value and tunnel axis
direction. The engineering application shows that: (1) The calculation value of
the proposed method has high fitting accuracy with the measured insitu stress value with a fitting degree of approximately 85% for the
maximum horizontal principal stress. (2) The principal stress values of the
tunnel axis and the maximum horizontal principal stress direction were obtained
through interpolation. The maximum horizontal principal stress of the tunnel
was 52.50 MPa, and the principal stress direction of the tunnel was primarily
in the NW direction, with local sections in the NE direction.
