盾构土舱压力变化规律测试试验与理论分析

doi:10.13722/j.cnki.jrme.2014.1440

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Abstract The simulating driving test of shield machines is carried out by using a model shield of earth pressure balanced type with cutterheads of different open area ratios. Through measuring the earth pressure inside and outside the chamber，the relationship between earth pressure and open area ratios of cutterheads is gotten. Based on the theory of fluid mechanics，a calculation formula of the pressure change is deduced and the quantitative analysis of the influence of aperture ratio，tunnel diameter，soil parameters，additional stress on changes of the earth chamber pressure can be performed by means of the deduced formula. According to the formula，when the angle of internal friction and cohesive increase，the difference of chamber pressure and earth pressure outside become greater. Besides，when the rate of opening on cutterdisc and diameter of shield tunnel increate，the difference of chamber pressure and earth pressure outside become smaller. Comparisons between results of theoretical calculations and the other means，such as field monitoring and discrete element simulation analysis are done，which confirms the rationality of the gotten formula.

Key words： tunnelling engineering model test fluid mechanics earth chamber pressure rate of opening on cutterdisc

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	Articles by authors
	JIN Dalong
	YUAN Dajun
	LI Xinggao

Cite this article:

JIN Dalong,YUAN Dajun,LI Xinggao. Test and theoretical analysis of change laws of earth chamber pressure[J]. , 2016, 35(S1): 2960-2967.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1440 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2960

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