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

doi:10.13722/j.cnki.jrme.2016.0606

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Abstract

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.

Key words： tunnelling engineering segment uplift variable composite formation construction parameters synchronous grouting

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	Articles by authors
	SHU Yao1
	ZHOU Shunhua1
	JI Chang1
	XU Runze2
	HUANG Zhonghui3

Cite this article:

SHU Yao1,ZHOU Shunhua1,JI Chang1, et al. Analysis of shield tunnel segment uplift data and uplift value forecast during tunnel construction in variable composite formation[J]. , 2017, 36(S1): 3464-3474.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0606 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3464

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