1. Weak rocks in engineering practice;Durmeková,2003
2. Critical issues in soft rocks;Kanji;J Rock Mech Geotech Eng,2014
3. Characterization testing and monitoring;Rock,1981
4. Strength of rock and rock masses;Hoek;ISRM News J,1994
5. Review of current empirical approaches for determination of the weak rock mass properties;Zhai;Procedia Eng,2017