Rock Bolts play a supporting role in coal mines. As an active support technology, rock bolt support is taking an increasing proportion in roadway support in China and even in the world. Its simple and fast construction, simple construction method, good support effect, lighter labor intensity, and better adaptability have been widely recognized. At the same time, with the development of anchor support equipment, it has become more widely used in the well mining practice.

When roadway construction is carried out in broken surrounding rocks, the multiple damages to the coal rock mass should be minimized, and the mechanized operation is appropriate. The construction of anchor holes should adopt a rotary cutting process to avoid impacts and vibrations on the coal rock mass as much as possible. In formulating countermeasures or modifying design plans for bolt support in roadways in broken coal rocks, in addition to reducing the spacing between bolts or cables according to specific conditions, the following techniques can be considered.

High-strength and full-length rock bolt support technology: The anchoring force of the high-strength and full-length anchoring anchor is distributed over the full length of the rod body, which prevents the anchoring force of the end-anchor rock bolt from concentrating on surrounding surrounding rocks. The support effect of the high-strength and full-length anchor bolt is several times or even ten times that of the ordinary end anchor bolt with the same diameter. There is basically no void in the anchor hole of the full-length anchor, and the rod body and the anchoring agent are integrated into the surrounding rock, which improves the bearing capacity of the anchor greatly. The use of high-strength and full-length anchoring bolts can provide greater initial anchoring and anchoring forces, give full play to the restraining and shearing effects of the anchors on the coal rock mass, and improve the integrity and bearing capacity of the surrounding rock.

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