Analysis of shield tunnel segment uplift data and uplift value forecast during tunnel construction in variable composite formation
SHU Yao1，ZHOU Shunhua1，JI Chang1，XU Runze2，HUANG Zhonghui3
(1. Key Laboratory of Road and Traffic Engineering of the Ministry of Education，Tongji University，Shanghai 201804，China； 2. China Railway Construction Bridge Engineering Bureau Group Co.，Ltd.，Tianjin 300300，China；3. Nanning Rail Transit Co.，Ltd.，Nanning，Guangxi 530029，China)
Aiming at the problem of shield tunnel segment uplift during tunnel construction in variable composite formation of Nanning Metro，a sectional statistical analysis on the measured uplift data of a metro shield tunnel is performed and the mathematical distribution characteristics of the uplift value for the typical stratigraphic sections of silty sand-gravel，sand，mudstone-silty mudstone and silty clay are obtained respectively. Then the ruler for the main uplift factors such as the grouting pressure，grout proportion and the actual slag discharge is investigated and the cause of segment uplift in the typical stratigraphic sections is revealed. Then based on the known main factors that influence the tunnel uplift，the longitudinal equivalent continuous beam model is applied to predict and analyze the segment uplift. The results show that the uplift value for the typical stratigraphic section follows normal distribution approximately with respective mean mainly in 30–60 mm. Formation characteristics and tunnel depth have important influence on segment uplift. The uplift value for sand is smaller，while that for silty sand-gravel，mudstone-silty mudstone and silty clay is larger. Synchronous grouting grout proportion and grouting pressure are the main construction factors affecting the tunnel uplift. The stability for sand and gravel stratum is disturbed by over-excavation and large uplift is caused. The overlying gravel is disturbed by over-excavation in mudstones，further exacerbating the influence for the grout pressure，swelling force and squeezing force to tunnel of "earth-carrying" effect on the segment uplift. The results of the equivalent beam model and the field measured data match well and the suggestion of using the model with existing data feedback from field to predict the value of uplift and test construction parameters and measures so as to guide the determination and adjustment of shield construction in the field is proposed.
舒 瑶1，周顺华1，季 昌1，徐润泽2，黄钟晖3. 多变复合地层盾构隧道施工期管片上浮实测数据分析与量值预测[J]. 岩石力学与工程学报, 2017, 36(S1): 3464-3474.
SHU Yao1，ZHOU Shunhua1，JI Chang1，XU Runze2，HUANG Zhonghui3. Analysis of shield tunnel segment uplift data and uplift value forecast during tunnel construction in variable composite formation. , 2017, 36(S1): 3464-3474.
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2017, Vol. 36 
