盾构施工振动振源的影响因素研究

Research on the Influence Factors of Vibration dueto Metro Shield Construction

摘要:

以北京地铁8号线盾构施工工程为研究背景，针对线路区间内的典型工况，通过在盾构施工作业面进行的现场振动测试工作，得到盾构施工振动振源的幅频特性。在这些工作的基础上，首先利用灰关联熵分析方法对影响振源振动的因素进行影响因素的敏感性分析，其次利用多元回归分析方法对影响振源振动的主要影响因素进行回归分析，主要的成果包括：（1）首次提出了盾构施工振源的主控因素—地层条件及其量化特征参数—掌子面地层加权动弹性模量，以及影响振动的主要施工参数—刀盘扭矩、总推力；（2）建立了盾构施工振动振源的回归模型，相关性显著。这些工作为进一步实施盾构施工振动对周围环境的影响的分析、预测、施工控制提供了基础，填补了相关研究的空白。

关键词:盾构施工; 振动; 因素分析; 灰关联熵分析; 多元回归分析

Abstract:

This study focusess on the shield construction of Beijing subway line 8 under typical working conditions，using the field monitoring system at the shield construction work face，to obtain the amplitude and frequency characteristics of the vibration source.Based on these characteristics，we conducted a sensitivity analysis of the factors influencing the vibration source. We first used the grey relation entropy method，and then performed multiple regression analysis on the vibration induced by the metro shield construction.The research results are as follows：（1） we propose that the main controlling factor of the shield construction vibration source-the stratum condition and its quantization characteristic parameter-is the weighted dynamic elastic modulus of the tunnel face stratum，and the main construction parameters influencing the vibration are the cutter head torque and the gross propulsion；（2）we establish a regression model of the shield construction vibration source which shows remarkable correlations.These research results may be used as a basis for analysis，forecast，and construction with respect to controlling of the environmental vibration response caused by shield construction，which fills a void in this area of research.

Key words:metro shield construction; vibration; factor analysis; grey relation entropy analysis; multiple regression analysis