旁海航电枢纽断层带坝基处理措施

Treatment measures for sluice foundation in bedrock fault zone in Panghai navigation-hydropower junction

清水江旁海航电枢纽水闸主体结构横跨于范围宽且深厚的断层破碎带或影响带,构造岩体破碎、力学强度低,对建筑物抗滑稳定较为不利。当采用常规灌浆方式进行地基处理时难以进浆,经现场试验研究,提出一种以“浓浆挤密、分段灌入、逐段控制压力”为原则的“脉冲式”的灌浆方法。声波测试表明,该灌浆方法效果良好,能够有效提高基础的整体性。结合固结灌浆孔的布置,在基础和建筑物之间设置锚筋桩,利用锚筋桩的工作机理,较大幅度提高了建筑物的抗滑安全系数。结合现场实施过程,固结灌浆结合锚筋桩的处理方式更为快速、经济,解决了建筑物抗滑稳定性的问题,达到了期望的效果。

The main structure of sluice spans a wide and deep bedrock fault fracture zone or influence zone in Panghai navigation-hydropower junction by the Qingshui River.The anti-sliding stability of the building is unfavorable due to broken structure and low mechanical strength of rock mass.It is difficult to grout when the traditional grouting method is used.Through the experiments,a pulsed grouting method based on the principle of“dense grout compaction,stage grouting and controlling pressure by section”is proposed.Sonic test shows that this grouting method has good effect and can effectively improve the integrity of foundation.Combined with the arrangement of consolidation grouting holes,anchor piles are set connecting the foundation and building.The safety coefficient of anti-sliding of sluices is improved considerably by the working mechanism of anchor piles.Through the practical implementation process,the ground treatment of consolidation grouting combined with anchor piles is confirmed more rapid and economical,which solves the problem of building anti-slip stability of the sluices and achieves the desired effect.