Abstract:

Destroying and timbering for times is always caused because of choosing of unreasonable timbering methods when we dig drifts in soft rocks such as weak-interbedded stratums atteration bands, or crushed zones. To settle such a problem, We summarized timbering methods suitable for such drifts by ensure projects can be carried through safely and smoothly.

Key words: Unstable drift, destroying for times, maintance principium, timbering method