The indirect analogy was applied widely in the three underground chambers in Xiaolangdi Hydropower Station. Though it can not explained clearly in theory that how the self drilling rock bolt and the shotcrete work to support the underground structure, it is not argued the success was achieved in practice.
The self drilling rock bolt is unique anchoring system and fulfills current and increasing demands of the tunneling industry and ground engineering for safer and faster production. Sinorock self drilling rock bolt is a reliable and convenient anchoring system which is applied in complicated geological conditions for rock support work. It is particularly applied in the following geological conditions, such as weathered rock, gravel layer, backfill, hard conglomerate, etc. The self drilling rock bolt system provides advantages for all areas of its applications, where boreholes would require the time consuming drilling with casing systems in unconsolidated or cohesive soil.
The supporting parameters designed for indirect analogy of self drilling rock bolt are as follows:
|Specification name||Surrounding rocks category||Span(m)||Shotcrete thickness(cm)||Self Drilling Rock Bolt|
|The technical specification of anchor bolt and shotcrete||>Ⅱ||15~20||12~15||–||2.5~3.5|
|The design specification of workshop||>Ⅱ||16~20||12~15||18~22||2.5~3.5|