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基于对数螺旋破坏模式,考虑黏土的非均质特征,采用极限分析上限法推导了盾构隧道掌子面支护力计算公式,通过优化计算得到了不同条件下的最优上限解。采用该破坏模式与已有的模型试验、工程实例进行对比,验证了在非均质土中采用双对数螺旋极限分析上限法的适用性;同时详细分析了在土体不同参数条件下,隧道掌子面支护力、滑动面范围的变化趋势以及工程影响,结果显示在非均质土中,掌子面支护效率的主导因素是初始黏聚力与掌子面超前核心土,最后通过归一化处理得到了非均质土中极限支护力的设计推荐图,可为工程中初步确定盾构隧道掌子面支护压力提供理论依据。
Based on the logarithmic spiral failure mode and considering the heterogeneous characteristics of clay, the upper bound method of limit analysis was used to derive the support force formula of face support of shield tunnel. The optimal upper bound solution under different conditions was obtained through optimization calculation. The damage model is compared with the existing model tests and engineering examples to verify the applicability of the upper bound method of double logarithmic spiral limit analysis in heterogeneous soils. At the same time, The results show that in the heterogeneous soil, the dominant factor of the support efficiency of the face is the initial cohesion and the front core of the face, and finally passes The design recommendation of the limit support force in the heterogeneous soil obtained by normalization can provide a theoretical basis for the preliminary determination of the support pressure on the face of the shield tunnel in the project.