盾构掘进黏土地层泥水劈裂伸展现象研究  

Hydraulic fracture extending during slurry shield tunneling in cohesive soil

作　　者：袁大军[1] 黄清飞[1] 李兴高[1] 郭璇[1] 小泉淳[2] 

机构地区：[1]北京交通大学隧道及地下工程试验研究中心,北京100044 [2]早稻田大学

出　　处：《岩土工程学报》2010年第5期712-717,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上资助项目(50878015)

摘　　要：在泥水盾构隧道施工中,防止因泥水压力设定不当而导致泥水劈裂地层产生泥水喷发和开挖面坍塌,是至关重要的。土力学领域中劈裂伸展现象的研究成果甚少。软黏土地层中泥水劈裂有其发生和发展的过程,由于试样尺寸较小,这个过程在室内实验中难以完全捕捉到,而且实际地层中劈裂现象的发生与室内实验的现象有所不同。为准确掌握黏土地层中,泥水劈裂发生和发展的机理,使用自主研制的实验仪器,进行了现场深孔泥水劈裂实验,研究实际软黏土层中的泥水劈裂问题。现场实验再现了泥水劈裂及伸展过程,通过实验结果的分析和总结,得出了泥水盾构泥水劈裂持续压力、劈裂伸展速度计算公式及伸展流量的经验计算公式。It is crucially important to prevent improper slurry pressure which results in blowing out of slurry from ground surface due to fracture and collapse of cutting face during slurry shield tunneling in cohesive soil.Slurry fracturing ground has its occurring and developing process and the hydraulic fracture phenomenon is difficult to totally grasp in the laboratory because of small sizes of samples,and the occurrence of slurring fracturing ground in actual ground is different from that in laboratory.To master the occurring and developing mechanism of slurry fracturing ground,in-situ deep hole tests are done by using self-made experimental instruments.The tests exhibit the process of slurry fracturing and extending.Based on the analysis of test results,the formulae to compute the slurry fracture extending pressure and speed are drawn,and the empirical formula of the extending liquid is generalized.

关 键 词：泥水盾构 黏土地层 劈裂持续压力 劈裂伸展速度 劈裂伸展流量 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]