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On the critical particle size of soil with clogging potential in shield tunneling

Journal of Rock Mechanics and Geotechnical Engineering 2023年第2期15卷 477-485页

作者： Shuying Wang Zihao Zhou Pengfei Liu Zhao Yang Qiujing Pan Weizhong Chen School of Civil Engineering Central South UniversityChangsha410075China CCCC Second Harbor Engineering Company Ltd. Wuhan430040China Institute of Rock and Soil Mechanics Chinese Academy of SciencesWuhan430071China

Shield tunneling is easily obstructed by clogging in clayey strata with small soil ***,soil clogging rarely occurs in strata with coarse-grained ***,a critical particle size of soils should exist,below which there is a high risk of soil clogging in shield *** determine the critical particle size,a series of laboratory tests was carried out with a large-scale rotary shear apparatus to measure the tangential adhesion strength of soils with different particle sizes and water *** was found that the tangential adhesion strength at the soilesteel interface gradually increased linearly with applied normal *** the particle size of the soil specimen was less than 0.15 mm,the interfacial adhesion force first increased and then decreased as the water content gradually increased;otherwise,the soil specimens did not manifest any interfacial adhesion *** amount of soil mass adhering to the steel disc was positively correlated with the interfacial adhesion force,thus the interfacial adhesion force was adopted to characterize the soil clogging risk in shield *** critical particle size of soils causing clogging was determined to be 0.15 ***,the generation mechanism of interfacial adhesion force was explored for soils with different particle sizes to explain the critical particle size of soil with clogging risk in shield tunneling.

关键词： Shield tunneling Soil clogging Adhesion critical particle size

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Determination of the suspension competence of debris flows based on particle size analysis

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International Journal of Sediment Research 2014年第1期29卷 73-81页

作者： Hong-juan YANG Fang-qiang WEI Kai-heng HU Chuan-chang WANG Key Laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences

The determination of the critical particle size between solid and fluid phases,i.e.,the suspension competence,is fundamental for debris flow.A method for determining suspension competence based on particle size analysis is presented in this *** competence of static experimental water-debris mixtures prepared with the sediment of Jiangjia Gully is-0.025 mm if the bulk density is less than 1,800 kg m;and it increases with bulk density of more concentrated *** competence of natural debris flows in Jiangjia Gully increases exponentially with the bulk *** two data sets are compared in order to understand the suspension *** is concluded that turbulence may play a leading role in particle suspension in non-viscous and sub-viscous debris flows,while in viscous debris flows both matrix strength and excess pore water pressure play important roles.

关键词： Debris flow Suspension competence particle size analysis critical particle size particle suspension mechanism

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