Deformation control method when shield traverse building within short distance

Abstract

The invention discloses a deformation control method when a shield traverses a building within a short distance. The deformation control method comprises the following steps of: firstly, analyzing effects of shield tunneling on a stratum and the building under the conditions of different support pressure ratios and different grouting effects by using a numerical analysis method, and putting forward an optimal support pressure ratio and demands on slurry property; secondly, reinforcing shielding excavation surface stability control, improving muck inside a pressure chamber into be at a liquid-plastic state by a muck conditioning mode, reducing fluctuation of pressure control, and controlling overexcavation by comparison of actual slag quality and theoretical slag quality; and finally, reinforcing wall grouting liquid performance control, and timely filling a shield tail gap without loss of slurry by adopting high-intensity slurry with thixotropy. In a shield tunneling process, security monitoring can be reinforced; a shield tunneling parameter can be timely adjusted, and the security of an adjacent building is ensured. According to the method, a large amount of stratum reinforcing expense is reduced, and an underground space is utilized relatively effectively.

Description

technical field [0001] The invention relates to a deformation control method when a shield machine passes through a building at a short distance, and belongs to the technical field of underground engineering construction. Background technique [0002] Due to the increasing intensity of underground space development, shield tunneling sometimes has to pass through buildings at close range. At present, the commonly used method is to strengthen the soil within the area affected by the shield construction by grouting. The construction period is long and the cost is high. Under the premise of winning the bid at a low price in the current bidding system, the construction contractor is often willing to take risks and not carry out reinforcement. Due to poor technology, it is often impossible to guarantee the stability of the excavation surface and cause major safety accidents. At present, for earth pressure balance shield tunneling, it is generally considered that the concept of su...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: The present invention provides a deformation control method when the shield passes through the building at a short distance, aiming at solving the construction control of more and more shield passing through the building and the underground pipeline at a short distance so as to minimize the impact on the building The problem