Multi-factorial Analysis on Vault Stability of an Unsymmetrically Loaded Tunnel Using Response Surface Method
Multi-factorial Analysis on Vault Stability of an Unsymmetrically Loaded Tunnel Using Response Surface Method
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DOI：
10.5829/ije.2019.32.11b.08
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发表时间：
2019-11
影响因子：
1.3
通讯作者：
D. Zhang;Z. Zhang;T. Cheng;X. Zhao
中科院分区：
文献类型：
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作者：
D. Zhang;Z. Zhang;T. Cheng;X. Zhao
研究了采用环形开挖核心岩支护的偏压隧道拱顶沉降特性。采用响应面法设计试验，对试验结果进行评价，优化设计参数，以减小拱顶沉降。首先考察了水平距离、台阶长度、隧道深度、核心岩宽度、围岩强度和支撑强度等参数，然后推导出二阶多项式回归方程来预测拱顶沉降响应。通过方差分析（ANOVA）评估模型的贡献百分比、有效性和不同参数的效应及其相互作用。影响因素由大到小依次为围岩强度、支护强度、水平距离、核心岩宽度、掘进深度、步距。结果表明，通过调整围岩宽度、台阶长度和支护强度等可控因素，可以减小围岩强度、开挖深度和水平距离等不可控因素对拱顶沉降的影响。通过现场试验测量和仿真计算验证了本文方法的可行性。
This study investigated the vault settlement characteristics of an unsymmetrically loaded tunnel which was excavated by annular excavation via core rock support method. Response surface methodology (RSM) was employed to design the experiments, evaluate the results with the purpose of optimizing the value of design parameters for reducing the vault settlement. The parameters such as horizontal distance, step length, tunneling depth, width of core rock, strength of surrounding rocks and support strength were firstly examined, and a second-order polynomial regression equation was then derived to predict the responses of vault settlement. The percentage contribution, validity of model and effects of different parameters as well as their interactions were assessed by analysis of variance (ANOVA). In the order from high to low effect, these parameters are strength of surrounding rocks, support strength, horizontal distance, width of core rock, tunneling depth, and step length. The results indicated that the influence of uncontrollable factors (i.e. strength of surrounding rocks, tunneling depth, and horizontal distance) on the vault settlement can be reduced through the adjustment of controllable factors (i.e. Width of core rock, step length, and support strength). Moreover, the proposed method in this paper was validated with results of field test measurement and simulation calculation which verified its feasibility.