Construction method for earth pressure balance shield tunneling machine to laterally penetrate through initially-supporting mined tunnel at close range

Abstract

The invention provides a construction method for an earth pressure balance shield tunneling machine to laterally penetrate through an initially-supporting mined tunnel at a close range. The construction method comprises the following specific steps that firstly lofting is conducted on site to determine the side boundaries of two tunnels, construction of the mined tunnel is stopped, construction of partition piles is started, and an inclinometer, mined tunnel monitoring points and ground settlement monitoring points are laid; then initial values of all the monitoring points are collected, the shield tunneling machine starts to tunnel normally, data are collected, processed and analyzed, obtained information is fed back to constructors in time, and mining protective measures and tunneling parameters of the shield tunneling machine are dynamically adjusted; and finally after the shield tunneling machine passes through the mined tunnel smoothly, tunneling of the mined tunnel is started. The construction method for the earth pressure balance shield tunneling machine to laterally penetrate through the initially-supporting mined tunnel at the close range can quickly provide conditions and construction parameter guidance for shield construction, reduces the safety risk of mined tunnel construction, provides effective soil changing forms, and has good social effects and economic benefits in the aspects of construction periods, cost, safety, quality, and the like.

Description

technical field [0001] The patent of the present invention relates to the construction method when the earth pressure balance shield machine penetrates the initial support underground tunnel at a short distance. Under the conditions of relatively strict surrounding settlement control and tight construction schedule, the underground excavation tunnel and the earth pressure balance shield machine are constructed at the same time. Background technique [0002] In my country's subway construction, with the rapid economic development of various cities, vigorously promote the construction of subways, improve the overall image of the city, and solve the most fundamental problems of transportation for the people. The construction of earth pressure balance shield method has been widely used because of its wide adaptability, small impact on the environment and high safety. However, in order to shorten the construction period, several projects will be carried out at the same time, and...

AI Technical Summary

Problems solved by technology

Generally, the secondary lining is started after the initial support of the tunnel construction section is completed. At this stage, the strength of the tunnel wall is not high. When the shield machine enters the hole, there are problems when the initial support tunnel is excavated sideways at close range. Big safety risk, because the reinforcement of the underground excavation tunnel does not meet the requirements, and there are other complex geological conditions, resulting in uneven stress on the underground excavation tunnel, causing major security risks such as deformation of the initial support underground excavation tunnel, displacement of the shield tunnel, and even ground subsidence. risk

[0004] In addition, at the end of the shield construction, due to complex geological conditions or soil quality problems, it is difficult to guarantee the reinforcement quality of the end, and the force is uneven, which will also cause deformation of the initial support tunnel, displacement of the shield tunnel, and even the ground Subsidence and other major safety risks

Generally, the traditional method of strengthening the end of the shield is the reinforcement of rotary grouting piles, but the effect of using rotary grouting piles is poor, and there are defects such as half piles, sand inclusions, broken piles, etc., especially in shield tunnels and primary support underground excavation. When the tunnels are very close, the construction of jet grouting piles is more difficult. At present, there is no mature construction technology in China that can completely avoid this risk

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