Recycling method for shield tunneling residual soil

Abstract

The invention provides a recycling method for shield tunneling residual soil and relates to the technical field of subway shield tunneling residual soil. The method comprises the following steps: 1, the residual soil produced by shield tunneling is subjected to innocent treatment, and mud and gravel particles are separated through stage-by-stage screening; 2, the separated mud is subjected to chemical component analysis, and the optimal water content and the maximum dry density of a soil sample are obtained by laboratory tests; 3, a proper soil stabilizer is selected according to different water content and different soil sample components for a mix ratio test; 4, the mud is cured for backfill of a foundation pit. After curing, 7d unconfined compressive strength of backfill can reach 1.5 MPa, strength requirements are met completely, the shield tunneling residual soil resources are used, and stacking of the shield tunneling residual soil is reduced.

Description

Technical field [0001] The invention relates to the technical field of subway shield muck, in particular to a method for recovering and reusing shield muck. Background technique [0002] Shield construction has the advantages of good safety, high degree of mechanization, fast excavation speed, small disturbance to the environment, and wide adaptability to the ground. Therefore, shield construction is used in a large number of subway constructions. The earth pressure balance shield construction generally uses a track slag truck to transport the slag. The slag is cut by the cutter head and enters the soil bin. It is transported by screw conveyors and belt conveyors and discharged to the slag transport truck at the rear of the shield. It is transported by horizontal rails and hoisted by a vertical gantry crane to the ground, dumped in the slag tank and transported directly. Assuming that the diameter of the tunnel section is calculated as 6m, about 50,000 square meters are excavate...

AI Technical Summary

Problems solved by technology

The slag produced by shield tunneling is mixed with soil improvement foam agent, mineral bentonite, and slurry produced by grouting. If such slag is not treated, it cannot be landfilled and reused

When encountering a stratum with a high water content, it is difficult to discharge and transport the muck, and the mud is scattered in the tunnels and urban traffic arteries, resulting in expensive cleaning costs, and it is difficult for the spoil to meet the waste disposal standards of the environmental protection department

[0003] With the acceleration of urbanization, a large number of urban tunnels and subways are being built. During the construction process, a large number of shield mucks have increased significantly, and a large number of illegal spoils have occurred, which seriously pollutes the environment and is accompanied by serious safety hazards.

At present, the general practice is to centrally transport the muck generated by shield tunneling to a special landfill for disposal. This method not only cannot reuse the muck, but also greatly increases the cost of transportation.