Synchronous tunnel grouting and drainage construction method for controlling ground heaving

Abstract

The invention discloses a synchronous tunnel grouting and drainage construction method for controlling ground heaving. The method comprises the following steps that rotary spraying piles are arrangedfrom the ground surface to the two sides of a tunnel to form water stop curtains; after tunnel support is finished, drilling and grouting are carried out above the tunnel face to form an advanced reverse curved arch connecting the water stop curtains on the two sides; after the advanced reverse curved arch is formed, a drainage channel is drilled at the bottom of the advanced reverse curved arch along the tunneling direction, and accumulated water is drained through the drainage channel; and full-section grouting operation is carried out on the tunnel while opening of the drainage channel is guaranteed. The advanced reverse curved arch is in the shape of an arc which is opened towards the ground, water accumulation is easy, and the drainage effect is good after a hole is drilled at the bottom; the originally closed grouting system can be opened by reserving the drainage channel at the bottom of the reverse curved arch, so that drainage work can be synchronously carried out during tunnel advanced pouring construction, excess accumulated water in the stratum is further squeezed and drained by utilizing the lifting effect of grouting, excess pore water pressure caused by grouting construction can be remarkably reduced, and the purpose of preventing excessive ground heaving is achieved.

Description

technical field [0001] The invention belongs to the field of underground and geotechnical engineering, in particular to a tunnel grouting and drainage synchronous construction method for controlling surface uplift. Background technique [0002] Since the beginning of the 21st century, with the rapid economic development and the country's strong support for transportation construction, my country's tunnel and underground engineering construction has achieved unprecedented development, among which the development of urban subway tunnels is particularly rapid. Different from mountain tunnels, the construction of subway tunnels requires less disturbance to the strata and the surrounding environment, and its control standards are also stricter. However, since urban tunnels are often buried at a shallow depth (about 20m), tunnel construction is more likely to have a greater impact on the ground and even superstructures. Therefore, how to achieve construction micro-disturbance is a...

AI Technical Summary

Problems solved by technology

For this reason, one of the objects of the present invention is to provide a tunnel grouting and drainage synchronous construction method for controlling surface uplift, by setting vertical water-stop curtains to cut off the water source, setting advanced reverse arch water collection, reverse curved At the bottom of the arch, there are four links: p

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