Floor Repair How To Repair Concrete Basement Floor?

How to repair concrete basement floor? - floor repair

Cavé concrete floor on a portion of the sewer pipe to replace corroded cast iron and have a question about repairing the floor. The soil is very wet clay, and the trench around the pipe is approximately 1 x 6 m, 12 cm deep (3 "below the pipe). I must begin to dry the trench open for some time clay? Second, I filled the trench with concrete - which completely surrounds the tube, or other charge I have in the first and top with concrete?

THANX!