壁后注浆是盾构法施工过程中关键的一道工序。为了探究浆液强度的发展,将砂采用不同的筛分方法调配成细度模数分别为1.652,1.096,0.773的3种砂,并将3种砂分别用于配置惰性浆、硬性浆,并分别开展了凝结时间、直接剪切、立方体抗压试验,观测了细度模数不同的砂对惰性浆、硬性浆凝结时间、强度的影响。结果表明2种浆液的强度均随着用砂细度模数的增大而降低;硬性浆液中水泥的水化作用主要促进了黏聚力的增大及内摩擦角的降低;惰性浆液中粉煤灰的火山灰反应基本可以忽略。
Abstract
Backfill grouting is a critical step in the process of shield tunneling construction. In order to explore the development of slurry strength, we obtained sands of three different fineness modulus(1.652,1.096,0.773) by using different sieving methods and prepared inert slurry and rigid slurry by using the sands. Through setting time test, direct shear test and cubic compressive test, we observed the effect of fineness modulus of sand on the setting time and strength of inert slurry and rigid slurry. Results show that strengths of the two slurries decrease with the increasing of fineness modulus of sand. Moreover, cement hydration in rigid slurry mainly promotes the increase of cohesion and the decrease of internal friction; while the action of fly ash in inert slurry can be ignored.
关键词
泥水盾构 /
壁后注浆 /
砂细度模数 /
惰性浆 /
硬性浆 /
抗压强度 /
三轴试验
Key words
slurry shield /
backfill grouting /
fineness modulus of sand /
inert slurry /
rigid slurry /
compressive strength /
triaxial test
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参考文献
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