1. Squeezing rocks in tunnels;Barla;ISRM News Journal,1995
2. Engineering geological characterization of weak rocks: classification, sampling and testing;Clerici,1992
3. Roadway support theory based on broken rock zone;Dong;Journal of China Coal Society,1994
4. Discussions about determination of soft rock and critical depth of tunnels;Fan;Ground Pressure and Strata Control,1995
5. Research on the tunnel support of soft rock in China;Feng;Ground Pressure and Strata Control,1990