Rock bolt which will enhance surrounding rocks’ integrity

10/set/2016 09:12:11 sinorockzqq Contatta l'autore

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As for tunnels with developed bedding joint and plenty water burst, surrounding rocks belong to IV-V class, which is loose blocky structure and easy to break. If efficient methods don’t be adopted, it will influence project’s progress and quality, even cause security problems.

Because of broken, loose surrounding rocks, mixture of mud, worse stability after water seepage saturation, advanced support should be carried out to guarantee project. Mortar anchor bolt and ductule are difficult to drill holes, grout, control mortar’s plumpness and easy to collapse, time-waste and energy-waste. They provide channels for underground water’s invasion, which causes corrosion of steely rods and then influences rock bolt’s durability.

While self-drilling hollow anchor bar can overcome above disadvantages. As advanced support, it can improve construction quality and progress effectively. In IV-V class surrounding rocks, self drilling rock bolt can drill to designed depth and then grout. When grouting, non choking first and then stopping plug until slurry return to orifice. Slurry, as veins, permeates into broken rock mass under grouting pressure, ejects air and moisture, solidifies loose rocks and bonds rock bolt with surrounding rocks, which will enhance surrounding rocks’ integrity, anti-permeability and stability, and help to excavate and support project.

The design of self drilling rock bolt’s anchorage body depends on self-structure’s 

particularity: anchorage body consists of self drilling hollow bar and grouting body, its 

size depends on designed anchorage. 

When self drilling rock bolt is applied for reinforcing slope, pulling test should be 

carried out. Then basing on pulling resistance, length test and diameter of anchorage 

segment, figuring out bonding strength and shearing strength among grouting body, self 

drilling anchor bar and surrounding soil body. 

To make design and construction of self drilling rock bolt reach to requirement of 

advanced technology, economy and high-quality, supporting parameters should be confirmed: anchorage force, self drilling rock bolt’s length and diameter, separation distance and array pitch.

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