工程施工钻孔中，经常遇到不稳定地层。
卵砾石地层是钻探工程中常见的一种典型的不稳定地层。
Gravel strata is a kind of typical instable layer in drilling engineering.
无水砂卵石是一种典型的力学不稳定地层，对盾构存在较大的不良影响。
Waterless sandy cobble is a typical unstable stratum which is unfavorable to shield construction.
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。
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。
Gravel is a typically unstable stratum and its mechanical properties is unfavorable to tunnel face stability.
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