Abstract
The producing and expanding mechanism of broken rock zone in intermittent jointed rock mass with different orientation was studied by physical modeling. The bulking deformation characteristic of surrounding rock and its influence on roadway stability were analyzed. The results show that the development of broken rock zone can be concluded into three stages as initial, developing and stable stage with the increase of stresses. The displacement is different in side walls of roadway with different joint orientation, the displacement of the upper wall is more than that of the lower along the direction of joint inclination. Every time the abrupt increase of convergence velocity indicates the occurrence of intense failure in surrounding rock, thus support should be intensified in good time. When the angle of joint ranges from 30-75°, the effect of joint orientation on rock mass strength is great. Especially, when the joint angle is 60°, rock mass strength and roadway stability are the lowest. The stability and displacement of jointed rock mass are different with intact rocks out and away, these of intact rocks are better.
| Original language | English |
|---|---|
| Pages (from-to) | 860-865 |
| Number of pages | 6 |
| Journal | Meitan Xuebao/Journal of the China Coal Society |
| Volume | 33 |
| Issue number | 8 |
| Publication status | Published - 1 Aug 2008 |
| Externally published | Yes |
Keywords
- Broken rock zone
- Bulking deformation
- Intermittent joint orientation
- Stability