深圳地铁五号线西大区间矿山法暗挖隧道顶部处于富水砂层中,砂层的自稳性较差,容易造成隧道突水、涌砂和坍塌现象。通过采用水平旋喷桩技术,在暗挖隧道拱顶形成一个水泥与砂层混合而成的环状帷幕体,对原土体进行了改良,不仅克服了富水砂层自稳性差的弱点,而且起到了抗变形、防流沙、防渗透的作用,保证隧道掘进安全。 The top of the tunneling method of mining method at the west section of Shenzhen Metro Line 5 is in a water-rich sand layer, which has poor self-stability and easily causes water inrush, grit-sinking and collapse of the tunnel. Through the use of horizontal jet grouting pile technology, an annular curtain body formed by the mixing of cement and sand is formed on the top of undercut tunnel, and the original soil body is improved, which not only overcomes the weakness of poor self-stability of water-rich sand layer, But also played a role in anti-deformation, anti-sands, anti-infiltration to ensure tunneling safety.