Research on property and microstructure of mixture with soil paticles and conditioning foam in TBM earth pressure bin

Published: 22-11-2019| Version 7 | DOI: 10.17632/p5t2yf7dd7.7
Contributor:
Chao Ma

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raw data for Research on property and microstructure of mixture with soil paticles and conditioning foam in TBM earth pressure bin micro-structural mechanism of conditioning the excavated soil in Earth Pressure Balanced TBM

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1.results of the experiment on the two pebble soil samples demonstrate this law: if moisture content and foam injection is in relatively reasonable state, the arrangement of mixed soil structure is more loose, with much pore .If Moisture content and foam injection is in less reasonable condition, the micro-structural arrangement of mixed soil is dense, with little pore. The porosity is bigger when the conditioned soil is in a proper state. The dense state of the improperly conditioned soil leads to its bad fluidity. 2.For clay, sand and gravel soil, because their particle size is different, the micro-structures also show some differences. For Cohesive soil, sticky particles bond together, wrapping the bubbles inside; sand particles and air bubbles evenly distributed between the sand particles and air bubbles wrong arrangement. Pebble soil contain large particles and sticky particles. The micro-structure is very different from the two above. A large particle is the base, while sticky particles are bonded around the large particles , with Bubbles surrounding outside. The different pores in the conditioned soil help to change the soil’s particles distribution curve. As a result, the property of the soil is changed.