Abstract:

In order to solve the problems of steepinclined limestone, poor selfsupport capability of weak and soft shale and difficulties in the control of the rock mass deformation in the construction of the underground power plant of Pengshui hydropower station, the new technology of expansion and prestressed type hollow grouting bolt with steel wedge is adopted to reinforce the shallowcovered rock mass. The anchor piers with steel plates, which are used to replace the original concrete anchor piers, can simplify the construction technology, ensure the construction quality and enhance the construction speed. Thus, the wall rocks are deeply and immediately anchored and the deformation risks of the wall rocks are minimized. The comprehensive application of the new anchoring technology ensures the shallow and/or deep anchoring quality in soft and weak shale. In addition, the new technology results in significant economic and social benefits and can be popularized.

Key words: expansion and prestressed type hollow grouting bolt with steel wedge, anchor piers with steel plate, largescale underground power plant engineering, Pengshui Hydropower Station