Large-diameter slurry shield comprehensive tunneling method for strong permeable soil and rock composite stratum

Abstract

The invention provides a large-diameter slurry shield comprehensive tunneling method for a strong permeable soil and rock composite stratum, and relates to the field of shield construction. Accordingto the method, a combined type atmospheric pressure cutterhead is adopted, cutter locations are arranged on the cutterhead, and tools which can be changed at the atmospheric pressure are installed onthe cutter locations; the cutter locations include a Class I cutter location fixed in the form of the tool and a Class II cutter location which can realize hobbing interchange at the atmospheric pressure; fixed tools are installed on the Class I cutter location, interchangeable tools are installed on the Class II cutter location, and cutting trajectories of the interchangeable tools covers the cutterhead; tunneling process control includes control over the cutterhead rotating speed, control over the cutterhead thrust and torque, control over the cutting opening pressure, control over attitude,and control over synchronous grouting construction parameters; and rigid single-fluid slurry with water dispersion resistance is adopted during synchronous grouting construction. By adopting the combined type atmospheric pressure cutterhead, the two types of tools are sepatrately mounted on the cutterhead, the two types of cutter locations cover the cutting trajectory of the entire cutterhead, the fixed tools are used for cutting soil mass, the interchangeable tools are used for cutting rock mass, and therefore smooth tunneling of composite geology is ensured.

Description

technical field [0001] The invention provides a large-diameter mud-water shield comprehensive excavation method in a strong water-permeable soil-rock composite stratum, and relates to the field of shield construction. Background technique [0002] The mud-water shield construction method is a very mature tunnel construction method. Due to its advantages of "little environmental disturbance, high construction efficiency, and good stratum adaptability", with the rise of my country's subway construction, more and more cities are building tunnels in the subway Select this construction method during construction. However, due to the regional and unique nature of geotechnical engineering, mud-water shields will inevitably encounter some special engineering geological conditions during the construction of urban subway tunnels. At present, the most difficult one is the composite strata of upper soil and lower rock. [0003] Due to the huge difference in the physical and mechanical p...

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Problems solved by technology

[0003] Due to the huge difference in the physical and mechanical properties of soil and rock, when these two materials coexist in the excavation surface of the muddy water shield, the working conditions and states of the shield tunneling systems will change drastically, which directly leads to "severe wear of the cutterhead and cutter, The cutter head is easy to form mud cake, the excavation speed is slow, and the excavation direction is shifted" and many other technical problems. If the upper soil permeability coefficient is high, there will also be "poor mud film quality, unstable excavation surface, pressured into the warehouse Difficulty" etc.

[0004] Most of the existing composite geological construction methods use earth pressure balance shield tunneling, and the relevant control technology for tunneling construction of mud-water shield tunneling in strong permeable upper-soil and lower-rock composite strata is not perfect enough

[0005] At the same time, the existing technology does not consider the special geological conditions of the shield tunneling for the control of the stability of the building structure or the surface settlement near the shield tunneling area, and is an applicable construction method for homogeneous strata (compared to composite strata). Moreover, most of the patent research objects are earth pressure balance shields, which have little enlightening significance for the patent of the present invention

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