大石门水库古河槽帷幕灌浆效果检查分析

Inspection and analysis of curtain grouting effect in ancient channel of Dashimen Reservoir

新疆大石门水库工程古河槽深厚覆盖层厚度达238 m,地层结构较为复杂。主要由中更新统冲积砂卵砾石层泥质胶结、半胶结、夹砂层组成,具有典型的成层性、不均匀性和各向异性等特点。采用机械辅助、人工为主分段距、分高程开挖方式检查帷幕灌浆效果,测量、记录浆液扩散半径、充填密实度、相邻孔的搭接及孔斜偏距等情况。直接观测、比较并评价各种灌浆方法的灌浆效果。

The deep overburden layer of the ancient channel of Xinjiang Dashimen Reservoir Project is 238 m thick and the stratum structure is relatively complex.It is mainly composed of the middle pleistocene alluvial sand-gravel layer with argillaceous cementation,semi-cementation and sand inclusion layer,which has the characteristics of stratification,inhomogeneity and anisotropy.The curtain grouting effect was checked by mechanical assistance,manual excavation and elevation excavation,and the grouting radius,filling density,lap of adjacent holes and hole deviation distance were measured and recorded.The grouting effects of various grouting methods were observed,compared and evaluated directly.