管片拼装是盾构法隧道施工中的关键环节，合理的拼装点位选择对于隧道质量和施工效率至关重要。为此提出一种基于情境的管片拼装点位优选方法，通过设计点位生成器、模拟预测器和评价优选器，建立分级筛选的随境选择模型。该方法依据盾构与隧道的空间位置关系及其纠偏能力，将复杂工况划分为不同的施工情境，并针对每种情境设定相应的优化目标和权重系数。将管片拼装要求、盾尾间隙及油缸行程差等因素作为约束条件纳入优化目标中，使得管片拼装点位选择更加灵活全面和客观合理。通过上海12标右线工程仿真试验分析，证明随境选择模型在提高点位选择精度和合理性方面具有优势，与综合法、偏差法相比，随境法在不同施工情境下选择最优拼装点位时具有更好的有效性、准确性和通用性。
Segment assembly is a
critical aspect of shield tunneling, in which selecting key segment points is
vital for tunnel quality and construction efficiency. The selection process
must consider multiple influencing factors and adapt to complex and variable construction
conditions, posing challenges in meeting practical construction needs.
Therefore, a context-based
optimal selection method for key segment points is proposed. A hierarchical
filtering model for context-based selection is
established by designing a generator, simulation predictor, and evaluation
optimizer. This method classifies complex working conditions into various
construction contexts based on the spatial relationship between the shield and
tunnel and its deviation correction capabilities. The corresponding
optimization objectives and weight coefficients are set for each context.
Factors such as segment assembly requirements, tail clearance, and cylinder
stroke differences are incorporated into the optimization objectives as
constraints, enhancing the flexibility, comprehensiveness, objectivity, and
rationality of the selection process. A simulation experiment on the Shanghai
Bid 12 right-line project demonstrates that the context-based selection model improves the accuracy and rationality of point
selection. Moreover, a comparison with different optimization objective design
methods confirms the effectiveness, accuracy, and applicability of the model in
selecting optimal assembly points under various construction contexts.
