Method for selecting and judging tunneling mode of dual-mode tunnel boring machine in frequency-varying stratum

Abstract

The invention discloses a method for selecting and judging a tunneling mode of a dual-mode tunnel boring machine in a frequency-varying stratum. The method comprises the following steps of identifyingand judging a geological environment of a starting section of the dual-mode tunnel boring machine, judging a mode of the starting section, and selecting and judging a mode of a tunneling process. When mode selection is carried out in the tunneling process, equipment key rock machine geological perception parameters are taken as entry points, and accurate judgment of TBM and EPB mode conversion isrealized through intelligent analysis and judgment of the key parameters of the tunnel boring machine and assistance by geological prospecting data and slag sample analysis. According to the method,the problem of judging the optimal mode conversion position of the dual-mode tunnel boring machine is solved, the application of different modes of the dual-mode tunnel boring machine is more normative through accurate mode conversion opportunity judging, the tunneling efficiency of the dual-mode tunnel boring machine in the frequency-varying stratum is improved, and the construction efficiency isprevented from being influenced and the engineering risk is prevented from being caused by improper mode selection and inaccurate judgment.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for selecting and discriminating the excavation mode of a dual-mode tunnel boring machine in frequently variable strata. Background technique [0002] Due to the diversity of geological environment and the unpredictability of underground engineering development, the complexity of tunnel construction is getting higher and higher. When the stratum in the tunnel interval changes frequently and soft soil and hard rock interact, a solution is to target soft soil, hard rock, etc. Rock and geology respectively select the corresponding shield machine and TBM for construction. However, when the soft soil tunnel section or the hard rock tunnel section is relatively short, the cost of this scheme is very high. Another solution is to develop a new type of equipment that integrates the functions of shield tunneling and TBM, and use the mode switching of shield tunneling ...

AI Technical Summary

Problems solved by technology

[0004] However, in actual engineering, on the one hand, due to objective factors such as the long tunnel line section, large buried depth, and complex and changeable geology, the geology of some tunnel sections cannot be surveyed in detail; This leads to the following problems:

[0005] (1) Due to the problem of geological exploration data, it is difficult to judge the interface between soft and hard geology. It is difficult to grasp the position of 10-15 meters at the interface between soft rock formation and hard rock formation as the reference standard for the position of mode conversion, and it is not accurate to judge the timing of mode conversion

[0006] (2) The inaccurate judgment of the mode conversion position not only affects the construction efficiency, but also causes engineering risks due to improper mode selection

If the TBM mode should be used for excavation and the EPB mode is used for excavation, it will cause problems such as low excavation efficiency, wear of the cutterhead, cutter, and screw conveyor, and poor ballast discharge during normal pressure excavation; It is very easy to cause problems such as gushing and sandblasting when encountering working conditions such as rich water and soft soil, thus causing engineering risks

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