Micro disturbance tunneling method used for shield machine to tunnel under building on rich water weak formation

Abstract

The invention discloses a micro disturbance tunneling method used for a shield machine to tunnel under a building on a rich water weak formation, and belongs to the technical field of shield machine tunneling engineering. The method includes the steps of (1) selecting a shield machine cutter head suitable for the rich water weak formation, (2) inspecting work performance of the shield machine before the shield machine crosses the building, (3) carrying out muck improvement according to different soil layers, (4) setting soil pressure according to the upheaval degree in front of the cutter head, (5) setting tunneling speed according to the different soil layers, (6) determining synchronous grouting amount and secondary compensation grouting amount, pressure and grouting time, and (7) arranging and monitoring observation points when the shield machine tunnels under the building. When the shield machine tunnels under the building, the preceding processes are strictly carried out, micro disturbance caused by shield machine tunneling for the building is achieved, the settlement value of the building can be controlled to range from 3mm to negative 10mm, influences are hardly caused for the building, and safety of the building above the shield tunnel is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling engineering, in particular to a micro-disturbance excavation method for a shield tunneling under a building in a water-rich and weak stratum. Background technique [0002] The shield tunneling method is a fully mechanized construction method in the underground excavation method. With the vigorous development of rail transit construction in major cities, the shield tunneling method construction has the characteristics of good safety, high efficiency and low noise. The method has been widely used. When shield excavates in water-rich and weak strata, the settlement is not easy to control because of the poor stability of the water-rich and soft stratum. The excessive settlement of the building will cause the building to crack, tilt or even collapse, resulting in significant economic losses and bad social impact. At present, there is no mature safety control technology at home and abroad to ...

AI Technical Summary

Problems solved by technology

When shield excavates in water-rich and weak strata, the settlement is not easy to control because of the poor stability of the water-rich and soft stratum. The settlement of the building is too large, causing the building to crack, tilt or even collapse, resulting in significant economic losses and adverse social impacts