围岩稳定是指一定时间内，在地质力或工程荷载作用下，岩土体不产生破裂或失稳。
The stable surrounding rock refers to rock and soil masses does not produce break or loses steadilying under vary geological strength or the project loading in certain periods.
如果剪力滞系数过大，则应采取相应的措施防止这种应力集中现象出现，防止因产生局部开裂或失稳而造成结构的破坏。
If the shear lag is too large, should take appropriate measures to prevent such stress concentration phenomena, and to prevent cracking or buckling due to local production caused structural damage.
超前注浆管棚支护是一种避免在软土地层或含水地层中盾构隧道开挖面失稳的有效技术。
The advanced pipe grouting is an effective technique to avoid the instability of shield-tunneling faces in soft or water-bearing ground.
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