向家坝电站重件运输道路承台锚索灌浆试验

向家坝水电站右岸重件道路路基地质条件复杂，临江岸坡仅局部有基岩出露，坡面广泛分布松散堆积物，含有大量漂石或崩块石。设计采用预应力锚索对灌注桩顶部的钢筋混凝土承台进行锚固。为选择和优化在江水位以下的深厚覆盖层中实施预应力锚索的成孔、护壁、灌浆和张拉施工工艺，在上、下游分别选取典型地质断面进行锚索生产性试验。根据施工试验取得的成果，后续施工全部采用“止浆包单独灌浆+内锚段(9 m)+改进型布袋式止浆包”作为锚索灌浆施工工艺，施工后的观测资料表明，锚索张拉力及锁定张拉力均满足设计要求。

Anchor cable grouting experiment of concrete bearing platform of overweight machinery roads of Xiangjiaba Hydropower Station

The geological conditions of roadbed for overweight machinery on the right bank of Xiangjiaba Hydropower Station is complicated,and basic rock is outcropped only in local area at riverside slope,the loose debris containing a large number of boulders or collapse rubble is widely distributed on the slope.The pre-stressed anchor cable was designed for anchoring the reinforced concrete platform on the top of grouted piles.In order to select and optimize the construction technologies of pore-forming,wall protection,grouting and tensioning for thick overburden layer under river surface level,the anchor cable productive test was conducted at the typical geological cross-section in the upstream and downstream.According to the results of construction test,the construction technology of anchor cable grouting of "separate grouting with slurry blocking package + anchor segment(9m) + improved bag-type slurry blocking package" are adopted in all of the subsequent construction.The observational data after construction show that both the tensioning force and locking tensioning force of anchor cable can meet the design requirements.