Abstract:

The deepburied anchor cable group of a building foundation pit is met during shield boring in a cable tunnel in north ring of Shenzhen. The relationship between the cable tunnel and the foundation, environment on ground surface and engineering hydrogeological conditions are introduced. The construction scheme of combination of anchor cable cutting under pressure, artificial exploration shaft and hydraulic jack is adopted. The soil ahead cutterhead is reinforced through Soletanche and the mud membrane is established by bentonite which can provide pressured environment for anchor cable cutting through artificial exploration shaft and hydraulic jack. The anchor cables are finally cut and the shield passes successfully.

Key words: cable tunnel, anchor cable group, chamber entering under pressure, artificial exploration shaft, hydraulic jack, anchor cable removing