Abstract:Slotting is a key process in underground diaphragm wall construction, and slotting under deep rock geological conditions is one of the current difficult problems. This paper summarizes several slotting techniques for ultra-deep rock formation, including slotting with impact hammer, slotting with slotting milling machine, "two holes and one grasp" or "one hole and one grasp (milling)", and slotting with drill and blast. The main construction equipment and auxiliary construction equipment for slotting are introduced, and the key technologies of several combined slotting processes and their scope of application are discussed in detail. Based on the project of Songping Station, the practical application of two holes and one milling process and one hole and one milling process are introduced and compared and analyzed. The results show that the one-hole, one-milling process is 41% more efficient. This paper is a guideline for the construction of underground diaphragm walls into slots under deep rock conditions.
