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Distribution of bearing pressure around coal mining face
Release time:
2022-12-14
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Distribution of bearing pressure around coal mining face
1. Rear support pressure in front of work
(
1) The supporting pressure zone in front of the working face starts from 2~3m in front of the coal wall of the working face and extends to 20 ~
Range of 30m or more. The peak pressure area is about 4~10m away from the coal wall, and the peak value is comparable to that of the original rock.
1~3 times higher. The area in the face of the two roadways basically belongs to the requirements of advance to strengthen the scope of support.
(2) The supporting pressure behind the working face is much smaller than the supporting pressure in front of the working face. The specific distribution shape is related to the treatment method of the goaf, as shown in Figure 3-3.
(
3) The rear support pressure before work moves forward as the working face advances, so it is also called
1 One-knife-column method;
2 one caving method or filling method;
3 a hard top plate wall top
4-Other
Fig.3 -3 Distribution of supporting pressure before and after working face under different supporting conditions of goaf
Support pressure for movement.
(
4) The stress reduction zone is located between the front and rear support pressure zones, and the working face is in this range. Inside
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