Abstract:As an important method to reinforce high rock slope,prestressed anchorage technique is widely used in the high rock slope reinforcement of the permanent shiplock in the Three Gorges Project(TGP). Different from other projects,about 100 000 high-strength structural anchor bolts are installed in the high rock slopes of the Three Gorges shiplock. The large volume of slope reinforcement work of the shiplock,the technical complexity of installation and severe intervention the navigation activities on the critical path control the construction schedule. In order to select the appropriate anchorage material and construction technologies,to verify the design parameters of both rock bolts and anchor cables,and to accumulate installation experience,field test and laboratory tests are carried out on the site of the shiplock. The experiment shows that the resulted tensile stresses mainly distribute within the front section of the internal anchoring section with length 2.5 m. The composition of two early strength cement grout mixes marked as R3350 and R7350 is successfully developed to accelerate anchoring facilities installation and to reduce its intervention with the shiplock construction. It is measured that the pH value of the ground water in the sidewall slopes of the permanent shiplock is close to 8 during the construction period. Based on those characteristics,it is concluded that the groundwater is weakly corrosive to steel material and will appear as noncorrosive to the steel wire strands embedded in the cement grout set. The advanced model of 3 000 kN unbonded anchor cables with double anti-corrosion protection(including the corrugated pipe) is developed to meet the needs of stabilizing the high sidewall rock slopes of the permanent shiplock in the TGP.