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在工程地质条件较差、比较松软的白垩纪粉砂岩和红砂岩中,含砂质、泥质成分较高,成岩较差,软硬互层,形成差异分化,遇水极易崩解剥落,且有膨胀性。个别区域地下水含量较高的特殊地质条件下进行边坡开挖和防护,成孔后,孔壁会呈现破坏现象,穿索比较难,有可能钻孔损坏,无法下索。采用自钻式中空预应力锚杆技术即可很好解决该类地质难题,自钻式锚杆是一种新型材料,具有钻注锚组合在一个工艺过程内完成锚固的一套完整的锚固技术。
In the Cretaceous siltstone and red sandstone, which are poor in engineering geology and relatively soft, are sandy and muddy with higher diagenesis, hard and soft interbeds, which are differentiated and differentiated, easily collapsible and exfoliated in water, And swell. Excavation and protection of the slope under special geological conditions with high groundwater content in individual areas will result in the destruction of the wall of the hole after the hole is formed. It is difficult for the cable to penetrate through the hole, and the hole may be damaged and the cable can not be lowered. The use of self-drilling hollow prestressed anchor technology can be a good solution to such geological problems, self-drilling anchor is a new type of material, with a combination of drilling anchor anchor in a process to complete a complete set of anchoring technology .