苏通GIL综合管廊工程泥水盾构穿越致密复合砂层磨蚀性预测分析

发布时间：2018-03-31 08:40

本文选题：泥水盾构　切入点：致密砂层　出处：《工程地质学报》2017年05期

【摘要】：高磨蚀性致密砂层中盾构刀具磨损严重制约施工效率。为准确预测大直径泥水盾构刮刀的磨损量与削掘距离寿命,本文采用隧道断面面积统计分析法和分段体积统计分析法对苏通GIL综合管廊工程DK0+0~DK1+780段隧道所穿越的密实复合砂层进行统计分析。结合典型断面各地层面积权重,分段各地层体积权重及单一地层磨耗系数K得到了隧道穿越密实复合砂层各典型截面和分段上加权平均磨耗系数K'及其变化规律。根据加权平均磨耗系数K'及相应刀具磨损模型,对大直径泥水盾构在密实复合砂层中刀具磨损量及削掘距离寿命进行预测。并将预测结果与类似工程地质条件下南京长江隧道大直径泥水盾构实际施工过程中刀具磨损量及削掘距离寿命进行比较。研究结果表明:加权平均磨耗系数K'随掘进里程增加整体呈逐渐增大趋势,在1778m处取得最大值K'_(max)=18.36×10~(-3)mm·km~(-1);刀具最严重磨损发生在安装直径D=12.07m处。取限定磨损量δ=5mm,对应的削掘距离寿命分别为L_1=1063m和L_2=453m,因此需要进行两次刀具更换。与南京长江隧道泥水盾构刀具实际磨损情况的对比表明预测结果具有较高的可靠性。该研究成果为苏通GIL综合管廊工程及类似地层条件下越江隧道盾构刀具磨损预测及更换提供了一定的理论依据。
[Abstract]:In order to accurately predict the wear amount of large diameter mud shield shield scraper and the life of cutting distance, the wear of shield cutting tool in dense sand layer with high abrasion is seriously restricted to the construction efficiency. In this paper, the statistical analysis of cross section area of tunnel and the statistical analysis of sectional volume are used to analyze the dense composite sand layer passed through the tunnel of DK0 0~DK1 780 section of Sutong GIL integrated pipe corridor project, combined with the area weight of the typical cross section. The weighted average wear coefficient K 'and its variation law of typical cross sections and sections of the tunnel through dense composite sand layer are obtained according to the weighted average wear coefficient K' and the phase according to the volume weight and single stratum wear coefficient K of each section. Tool wear model, The tool wear and cutting distance life of large diameter mud water shield in dense composite sand layer are predicted. The prediction results are compared with the tool in the actual construction process of Nanjing Yangtze River tunnel large diameter mud water shield under similar engineering geological conditions. The results show that the weighted average wear coefficient K 'increases gradually with the increase of driving mileage. The maximum value of K'_(max)=18.36 脳 10~(-3)mm km-1 is obtained at 1778m, and the most serious wear of the tool occurs at the installation diameter D _ (12.07m). Taking the limited wear amount 未 _ (5) mm, the corresponding service life of cutting distance is L _ (1) (10 ~ (63) m) and L _ (2) (453) m respectively, so it is necessary to change the tool twice with the muddy water of Nanjing Changjiang Tunnel. The comparison of the actual wear conditions of shield cutting tools shows that the predicted results have high reliability. The research results provide a certain theoretical basis for prediction and replacement of shield cutting tool wear in Sutong GIL integrated pipe gallery engineering and similar strata.
【作者单位】：武汉大学土木建筑工程学院;武汉大学岩土与结构工程安全湖北省重点实验室;中铁十四局集团大盾构工程有限公司;国网江苏省电力公司;国网北京经济技术研究院;
【分类号】：U455.43

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