厦门翔安海底隧道土石交界软弱地层全断面注浆试验研究

Experimental Research on the Full Face Grouting for Weak Stratum in Soil and Rock Boundary for Xiamen Xiang′an Submarine Service Tunnel

研究目的:厦门东通道(翔安隧道)设计要穿越F1、F2、F3、F44个风化深槽(囊),为了保证海底隧道顺利通过风化深槽(囊),在服务隧道土石交界不良地质段,进行了全断面超前预注浆试验,为顺利通过海底风化深槽(囊)打下基础,并为其它类似工程提供参考。研究结论:全断面超前预注浆处理全强风化软弱地层效果好,但注浆过程中要严格控制注浆工艺和注浆参数。注浆工艺以前进式分段注浆为主,可结合后退式注浆;海底风化槽注浆纵向加固长度不宜超过25m,径向加固范围服务隧道建议为轮廓线外4m,行车隧道建议为轮廓线外5m;注浆材料宜采用超细水泥。

Research purposes： According to the design, Xiamen Xiang＇an Submarine Tunnel will pass through the four deep weathered troughs or capsules： F1, F2, F3, F4. In order to make the submarine tunnel passing through the weathered trough successfully and offer the reference to the similar work, the grouting experiment on full face grouting in advance is conducted in the bad segment of the soil and rock boundary. Research conclusions： Using full - face curtain grouting technology to deal with the deep weathered and weak stratum can obtain a good result, but the technique and technical parameters for grouting should be controlled well. The grouting technique should be the segmental grouting in advance along with afterward grouting. The vertical grouting length for submarine weathered troughs does not exceed 25 m. The area of the grouting in portrait should be 4 m out of the contour line of the service tunnel and the area of the grouting in the travelling tunnel is 5 m. The grouting material is GM cement.