Abstract: Under the dry-wet cycles, the argillaceous rock in Chengdu area demonstrates softening and slaking properties and these properties have adverse effect in the installation of ground anchors in the soft argillaceous rock. This paper summarizes and evaluates the conventional ground anchor installation methods in soft argillaceous rock. A new installation procedure starting from foundation excavation dewatering, treme concrete at bottom slab (hardening of working platform); borehole drilling (drilling debris collection and dust control methods are applied); borehole flushing; to waste water collection and sedimentation has been developed. This new anchor installation procedure has been successfully applied in the practical projects. The devices for the debris collection and dust control as well as the borehole flushing are simple for the manufacture and for the installation. These new devices have the advantage of environmental and construction personnel friendly, water and construction schedule saving, and cost effective.

Key words: Soft Argillaceous Rock, Installation of Uplift Resistance Aground Anchors, Drilling Debris Collection and Dust Control, Borehole Flushing