盾构隧道管片施工期上浮影响因素的现场试验研究

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Abstract Aiming at the problem of partially or integrally upward moving of tunnel segments during shield tunnel construction，based on the two metro shield tunnel project cases in which the great upward moving occurs in Ningbo，the field test of shield construction parameters，such as tunneling speed，vertical component force of reaction force of total thrust，synchronized grouting pressure and grout proportion，is conducted in the section that the external conditions(formation characteristic and burial depth) are similar. And combined with the monitoring data in the test section，the influence law of aforementioned single factor on segments upward moving during construction is analyzed. The results show that the amount of segment upward moving increases，when the grouting pressure of the lower segment is higher than that of the upper part. When the pressure difference is up to 0.3 MPa，the amount of upward moving increases about 20 mm. On the basis of little change of reaction force of the total thrust，when its vertical component force increases，the amount of upward moving raises correspondingly. When the component force increases by 260 kN，the amount of segment upward moving grows greater to about 15 mm. Keeping the same amount of cementitious material and mixing in equivalent non-cementitious material during synchronized grouting，the compression strength and cohesion of grout improve，the initial setting time shortens and the segment moves less higher with the reduction of ash cement ratio and water cement ratio. When the relative addition of cement in every 3 m3 of grout increases by 100 kg，the amount of segment upward moving decreases by 19.8 mm. the tunnelling speed，alone，has no distinct impact on upward moving of segments during construction.

Key words： tunnelling engineering segments upward moving shield construction parameter grout proportion field test anti-uplift measures

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	Articles by authors
	JI Chang
	ZHOU Shunhua
	XU Kai
	LI Xiaolong

Cite this article:

JI Chang,ZHOU Shunhua,XU Kai, et al. FIELD TEST RESEARCH ON INFLUENCE FACTOR OF UPWARD MOVING OF SHIELD TUNNEL SEGMENTS DURING CONSTRUCTION[J]. , 2013, 32(s2): 3619-3626.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3619

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