砂性土层泥水盾构泥浆成膜性能试验

doi:10.13722/j.cnki.jrme.2014.0056

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Abstract A slurry infiltration apparatus was developed to study the laws of filter cake forming during slurry shield construction in high permeability and complex strata. The laboratory test was aimed at finding the influence of slurry properties and materials on filter cake forming process，during which the uniform design was used. Results show that the slurry proportion is the primary factors influencing the filter cake quality. Larger pores in gravel sand can be filled by the cementation sets after the hydration of bentonite particles. And in medium-coarse sand and gravel sand，the appropriate slurry proportion is between 1.20 and 1.25，slurry material is suitable to choose both bentonite and clay which is compound by new pulp and original pulp. According to the slurry management during construction，slurry proportion is set by 1.20–1.25 and the usage of bentonite is 3–5 kg every 1 m3 of new pulp. Feedback shows that the proportion of the original pulp is stable in the corresponding range，which is to say the filter cake is forming well and the excavation face is stable.

Key words： soil mechanics slurry shield slurry materials proportion uniform test water filtration compact degree

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0056 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/Is1/3460

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