砂土地层中泥水盾构掌子面主动破坏模式试验研究

doi:10.13722/j.cnki.jrme.2018.0920

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摘要为研究砂土地层中泥水盾构掌子面主动破坏模式及极限支护力规律，设计一套基于粒子图像测速(PIV)等非接触测量方法的泥水盾构圆形掌子面稳定性控制模型试验系统。试验系统通过降低柔性压力室的水压来模拟泥水盾构掌子面的泥水压力失衡条件，利用PIV等非接触测量手段获取掌子面的位移、剪应变等变形过程，并通过监测水压获取泥水支护力的变化过程，实现对泥水盾构掌子面破坏过程的模拟。对3种埋深比(C/D = 0.5，1.0，2.0)下的掌子面破坏模式及极限支护力规律进行一系列的模型试验研究，试验结果表明：泥水支护力降低过程中，掌子面的变形可以分为4个阶段，其中第3阶段末掌子面处于极限平衡状态，对应的泥水支护压力为极限泥水支护力；随着泥水支护力的降低，掌子面变形逐渐向地表扩展，当埋深比较小(C/D = 0.5)时，临界破坏时的失稳区已经扩展到地表，而埋深比较大(C/D = 1.0和2.0)时，临界破坏时的失稳区尚处于地基内部；Soubra和Mollon理论模型中的破坏模式及极限支护力更接近于模型试验得到的结果。

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	刘海宁1
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	张亚峰1
	刘汉东1
	周建军1
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关键词 ：土力学, 泥水盾构, 模型试验, 掌子面主动破坏模式, 粒子图像测速(PIV), 极限支护力

Abstract：To study active failure modes and the limit supporting pressure of a slurry shield tunnel face through sand，a stability control model test system of a slurry-shield tunnel face was designed，which can imitate the slurry pressure imbalance across a slurry shield tunnel face by reducing the water pressure of a flexible pressure chamber and can simulate the failure of the tunnel face based on the displacement and the shear strain field collected by the PIV system and the water pressure monitored using a hydraulic gauge. A series of model tests were carried out to investigate the failure modes of the tunnel face and the limit supporting pressure with three different cover-to-diameter ratios of 0.5，1.0 and 2.0. The test results show that the deformation of the face can be divided into four phases as the support slurry pressure is reduced. At the end of the third phase，the tunnel face is in the limit equilibrium state and the corresponding slurry supporting pressure is the limit slurry supporting pressure. As the slurry support pressure decreases，the deformation in front of the face would gradually expand to the ground surface. It is also observed that，when the covered depth is relatively small(C/D = 0.5)，the critical failure zone reaches the ground，and that，while the covered depth is greater(C/D = 1.0 or 2.0)，the critical failure zone remains underground. The failure modes and the limit supporting pressure calculated by Soubra’s and Mollon’s theoretical models are closer to those obtained from the model tests.

Key words： soil mechanics slurry shield tunneling model test tunnel face failure mode particle image velocimetry(PIV) limite supporting pressure

引用本文:

刘海宁1，2，3，张亚峰1，刘汉东1，周建军1，2. 砂土地层中泥水盾构掌子面主动破坏模式试验研究[J]. 岩石力学与工程学报, 2019, 38(3): 572-581.
LIU Haining1，2，3，ZHANG Yafeng1，LIU Handong1，ZHOU Jianjun1，2. Experimental study on active failure modes of slurry shield-driven tunnel faces in sand. , 2019, 38(3): 572-581.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0920 或 http://www.rockmech.org/CN/Y2019/V38/I3/572

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