摘要
该文提出了盾构施工引起的地层移动的反分析优化方法，采用共轭梯度法优化程序并且基于等代层模型来评价地层移动，分析了回填注浆对地层移动的影响。通过南京地铁某盾构隧道监测数据的反分析结果，发现在粘土层中盾构施工对地表的影响角度大约为45°，回填注浆可以减少60％～80％的自然空隙。建立了新的经验公式来预测南京地区盾构施工引起的地层移动，实例表明该公式具有良好的效果。
An optimization technique for back-analysis of tunneling-induced ground movement is present in this paper. The conjugate gradient method is adopted for optimization procedure and equivalent ground loss model is utilized to evaluate ground movement. Besides, backfill grouting is analyzed for ground movement. According to the result of back-analysis using monitoring data of the Nanjing metro, the angle of influence zone of ground settlement is approximately 45° in clay layer and backfill grouting will reduce 60% - 80% of the physical Nanjing gap. Empirical equations are established to predict tunneling-induced ground movement in clay layer of metro. Case studies show the method can provide a reasonable prediction of ground settlement.
出处
《勘察科学技术》
2006年第6期3-5,34,共4页
Site Investigation Science and Technology
关键词
盾构
法等代层模型
反分析
优化
shield method
equivalent ground loss model
back-analysis
optimization
