Self drilling anchor bolt has two performances: drilling and grouting. It features a hollow bore for flushing, or simultaneous drilling and grouting. It can be installed in sites with weak rocks, loose soil, weathered layer, sand with stone layer where it is so difficult to create a hole in complex formation. The unconsolidated ground conditions favor the self drilling anchor bolt technique for fast and simple method of installed compared to the traditional method, which was confirmed by the application in Vertical Shaft at Left Bank of Xiluodu Hydropower Station.
Dong Miao residential area was located in the north side of Lvyou Road in Lixia District, Jinan province. The west of the area is the Jingzhuang Mountains. As the strongly-weathered limestone is the bearing directly basic layer, the geographic conditions is more complex. The landscape is hill and the total building area is about 37526㎡.
With the exploitation of the underground space in cities and the large scale construction of the underground retail spaces, the deep excavation projects is becoming more and more. The traditional deep excavation retaining method can not meet the requirement of the stabilization of large-scale underground buildings. Especially in sandy cobble stratum where the ratio of finishing gas hole is very low, it must lead to high pressure for the grouting and anchoring later and increase the construction cost.