软流塑地层盾构施工参数对地表竖向位移的影响  

Field test on surficial vertical displacement of soft-fluid plastic stratum caused by shield construction parameters

作　　者：唐宇 叶社保 张志宇 杨平[1] TANG Yu;YE Shebao;ZHANG Zhiyu;YANG Ping(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;China Communications Construction Co.Ltd.,Nanjing 210024,China)

机构地区：[1]南京林业大学土木工程学院,南京210037 [2]中交隧道局集团有限公司,南京210024

出　　处：《林业工程学报》2023年第1期179-188,共10页Journal of Forestry Engineering

基　　金：国家自然科学基金(51508279);中交隧道局科研项目。

摘　　要：为研究盾构法施工引起地表变形和对周边建筑及地下管线产生的影响,以佛山地铁3号线创意园站—驹荣北路站区间软流塑地层盾构隧道为背景,研究盾构穿越3种土层时不同盾构施工参数对地表竖向位移影响。根据现场实测数据,分析盾构施工对软流塑地层地表竖向位移的影响规律,得出盾构施工参数变化与地表竖向位移关系。结果表明:盾构工作面平衡压力主要影响盾构切口及切口前20 m,平衡压力与地表竖向位移基本呈正比线性关系,而对盾尾后地表竖向位移影响不明显;地表竖向位移日变量随盾构总推力的变化无明显规律,且当盾构总推力设定为15 000 kN,各土层的竖向位移日变量相对较小;刀盘切口后10 m内受盾构刀盘扭矩影响较大,在3种不同的土层中,当刀盘扭矩在1 100~1 600 kN·m时,测点竖向位移日变量为-4~3 mm;注浆压力主要影响盾尾后10 m范围内地表竖向位移量,注浆量控制在6.5~7.0 m^(3)/环能有效控制盾构推进后地表变形。In order to study the surficial deformation caused by shield construction in soft-fluid plastic stratum, as well as discuss its impacts on surrounding buildings and underground pipelines, the influence of different shield construction parameters on the surficial vertical settlement of soft-fluid plastic stratum, was investigated when the shield machine passed through three types of soil layers based on a Chuangyiyuan Station to Jurong Station section of Foshan Metro line 3 in Guangdong Province. By analyzing the field test data, the influence law of the surficial vertical displacement caused by shield construction parameters was analyzed, and the relationship between the changes of various construction parameters and the vertical subsidence of ground surface was obtained by comparative analysis. The results showed that the equilibrium pressure of shield working face mainly affects the shield incision at the first 20 m scope, while the equilibrium pressure and the vertical displacement possessed a direct proportional linear correlation. The effect of the vertical displacement on the caused surficial vertical settlement at shield tail was not significantly obvious. The daily variation of the vertical displacement of the ground surface had no obvious regularity with the change of total shield thrust and the daily variation of vertical displacement of each soil layer in soft-fluid plastic stratum was relatively small, especially when the total shield thrust was set to 15 000 kN. The cutter head was greatly affected by the torque of the shield cutter head within 10 m after the cutter head incision. The daily variation of the surficial vertical displacement of the monitoring point remained in the range of-4-3 mm in such special soil layers with the cutter head torque changing from 1 100 to 1 600 kN·m in the soft-fluid plastic stratum which consisted of three different soil layers. The grouting pressure mainly influenced the vertical displacement of the ground surface within 10 m behind the shield tail, and the groutin

关 键 词：地铁隧道 盾构施工参数 地表竖向位移 地层变形规律 软流塑地层 

分 类 号：TU478[建筑科学—结构工程]