摘要
防止泥浆劈裂是保证泥水盾构开挖面稳定的关键问题之一。利用自制的模具来模拟现场盾构机在地层中掘进的情形,结合应变控制式三轴仪开展了室内泥浆劈裂试验。研究表明：当泥浆黏度在18~30 s范围内,泥浆劈裂压力值随着黏度值的增大而明显增大;但当泥浆黏度超过30 s后,泥浆劈裂压力值随着黏度值的增大而变化较小;当泥浆黏度在25~30 s之间,森麟经验公式中的系数α取1.0左右。此外,增加围压也可以有效提高泥浆劈裂压力值。
To ensure the stability of excavation face, how to avoid the slurry fracturing during shield tunneling is always one of the most difficult problems. In this paper, a homemade testing instrument is used to simulate the process of slurry fracturing during shield tunneling with strain - controlled triaxial apparatus in laboratory. Testing results show that fracturing pressure value will notably increase when the increasing slurry viscosity is ranging from 18 s to 30 s, whereas the pressure effect is insignificant when the slurry viscosity is larger than 30 s. It is also found that parameter α in Mori＇s formula will be about 1.0 when slurry viscosity varies from 25 s to 30 s. In addition, the fracturing pressure value will also be increased remarkably by increasing the confining pressure.
出处
《城市轨道交通研究》
北大核心
2016年第11期64-67,72,共5页
Urban Mass Transit
关键词
盾构
泥浆劈裂
泥浆黏度
围压
shield tunneling
slurry fracturing
slurry viscosity
confining pressure
