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.

This paper presents the application of displacement back analysis for the tunnel engineering in gravel-cobble stratum taking the loosing zone into consideration.

In order to raise a level of the application researches on the back-analysis from displacements,an influence of the loosing zone caused by excavating an adit upon the resultsof back-analysis and how to raise unceasingly its precision,etc.

Then influence of loosing zone is analyzed through area division method based on loosing zone\'s formation mechanism,which is a new approach to consider the influence of loosing zone in underground engineering back analysis.

Application of the of surrounding rock loose circle theory in optimum roadway supporting design;

Development mechanism and engineering control technology for surrounding rock loose circle of deeply embedded long tunnel

Take the displacement and loose circle of rock to actual monitor,take the anchor rod,the anchor cable carries on the drawing experiment and the quality monitor,and deduces some useful condution,and this can be a guide to related projects.

Theory basis and practice of acoustic measuring boreholes arrangement for broken rock zone in gently inclined thin layer weakness structure

A numerical computation is made of broken rock zone around rectangular-shape roadways using ANSYS numerical simulation software, the qualitative and quantitative relation between broken rock zones and the factors affecting them is worked out.

Although the application of supporting theory of broken rock zone makes the supporting design have both the basis and remarkable benefits, the more empirical knowledge is still employed in the support design recently.