Abstract: With the continuous development of my country's railway industry, people are paying more and more attention to the development and utilization of underground space, which is accompanied by the gradual increase of deep foundation pit projects. Research has found that the water-stop curtain technology of triaxial cement mixing piles has been widely used in recent years because of its significant characteristic advantages and good social benefits. Based on this, this article analyzes the water hazards and the creation of a safe and dry working environment when it is applied to deep foundation pits with water-rich sand-bearing layers for reference.