stub cutoff wall

But the deep foundation in excess of 50m is a technically difficult problem in constructing the underground stub cutoff wall. In recent years it has been improved on equipment,techniques and materials,and breakthrough progress has been made.
超過50m的深地基是該項技術(shù)在構(gòu)筑地下防滲墻時難以跨越的技術(shù)難題。