Gravel is a typically unstable stratum and its mechanical properties is unfavorable to tunnel face stability.
砂卵石是一种典型的力学不稳定地层，盾构在此不利条件下安全穿越铁路困难较大。
To ensure the tunnel face stability in construction, the mud fluid properties must be obtained scientifically.
为保证施工过程中隧道开挖面的稳定，必须科学确定盾构泥浆特性参数。
Face stability is key point of tunnel shields excavation, Which influenced circumjacent environment.
开挖面的稳定是盾构施工技术的关键问题，直接影响到周边环境。
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