Determining bolted shotcrete and wire parameters and construction methods for roadways and crossings with the support theory of broken rock zone was conducted in Type V weaker rocks in the field of Pansan Colliery, Huanan.

Methods to define the laneways loose zone of thick coal seam with enriched gas and spontaneous combustion is studied in the article and define the rational the length of sealed borehole.

By using the technology of supersonic test and combining with the spot geology condition, the scope of the tunnel wall rocks loose zone can quite accurately measure out, thereby offering a dependable basis to the support of tunnel wall rocks.

Testing and judgment of surrounding rock loose zone of tunnel engineering is very important for construction supporting design in the tunnel construction period.

Numerical simulation of the broken zone in soft rock roads

Study of measuring the broken zone in soft rock roads in Daye Iron Mine

Based on the rock characteristics of strain-softening and dilatancy, this paper developed a theoretical formula for calculating broken zone thickness of roadways, analyzed the influence of buried depth, rock strength, strain-softening extent, and support pressure on the surrounding rock stability of the deeply buried roadways.