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介绍探索土体隧道掌子面开挖稳定性与施工条件的定量关系。首先,通过分析影响掌子面稳定性的主要因素提出掌子面稳定安全系数关于材料强度参数与施工条件参数的隐函数,并利用多元函数Taylor公式将掌子面稳定安全系数的隐函数变换为关于施工条件参数变量的多项式,然后给出确定单一施工条件参数变化下掌子面稳定系数的具体表达式的技术方法;重点提出采用响应曲面法确定多施工条件参数共同变化时F_s =F(t,s_t,s_s)的Taylor展开式。通过理想隧道开挖模型试验阐释该方法的具体应用,最后以狮子垄隧道工程为背景进行实例分析表明:在初始区域U_1内Fs的一阶模型是合适的,进而利用最速上升法寻找优化区域U_2,并经中心复合设计得到了F_s的二阶模型,经过方差分析验证此模型的有效性。
Introduction to explore quantitative relationship between excavation stability and construction conditions of soil tunnel face. Firstly, by analyzing the main factors that affect the stability of the face, the implicit function of the stability coefficient of stability of the face on the material strength parameters and the parameters of the construction condition is proposed. The multivariate Taylor’s formula is used to transform the implicit function of the stability factor of the face of the face And then give the technical method of determining the concrete expression of the stability coefficient of the facets under the single construction condition parameters. It is put forward that the response surface method is used to determine the common change of the parameters of multiple construction conditions when F_s = F (t , s_t, s_s). The concrete application of this method is illustrated through the ideal tunnel excavation model test. Finally, the case study on the background of Lion Ridge Tunnel Project shows that the first-order model of Fs in the initial region U_1 is suitable, and then the steepest ascent method is used to find the optimal region U_2 , And the second-order model of F_s was obtained through composite design of the center. The variance analysis verified the validity of this model.