TBM hob cutter ring rock opposite-grinding similarity test design method

Abstract

The invention discloses a TBM hob cutter ring rock opposite-grinding similarity test design method. The method comprises the following steps of: S1, obtaining information related to the frictional wear performance of a cutter ring; S2, acquiring parameters related to the frictional wear performance of the cutter ring during rolling rock breaking under the hob cutting depth h; S3, simplifying the cutter ring sample into a disc shape, setting a cutter ring blade contour equivalent coefficient ke and a cutter ring reduced scale proportionality coefficient ks, and obtaining the width B1 and the outer diameter R1 of the cutter ring sample; S4, determining the cutting depth h1 of the cutter ring sample, wherein if ks, mean (Fv1)<=mean(Fv) and max(Fv1)<Fvmax are met at the same time, S4 is stopped, and S5 is executed, otherwise, ks are reduced in the step S3, and the step S4 is executed repeatedly; S5, preparing a cutter ring sample and a rock sample; S6, driving the cutter ring sample to roll and cut the rock sample; and S7, recording and analyzing test phenomena and results. The method has high similarity with the actual working condition of the hob.

Description

technical field [0001] The invention belongs to the intersecting field of mechanical engineering, geotechnical engineering and tunnel engineering, and relates to a TBM hob cutter ring-rock grinding similarity test design method, in particular to a TBM hob cutter ring-rock used in conjunction with a planer Design method for grinding similarity experiments. Background technique [0002] Full-face rock tunnel boring machine (Full-face Rock Tunnel Boring Machine, TBM), because it has a combination of rock breaking excavation, tunnel support, tunnel slag discharge and other functions in one, the tunneling efficiency and safety factor are high, and the cost With the advantages of good tunnel quality and low environmental pollution, it is widely used in hard rock tunnel projects such as water conveyance tunnels and railway tunnels across mountains and ridges. The TBM directly contacts and cuts the rock through the cutter ring of the disc-shaped hob (hereinafter referred to as the ...

AI Technical Summary

Problems solved by technology

[0007] ①In some scaled-scale simple TBM hob cutting test benches, in order to accelerate the intensity of knife-rock interaction, the scaled-scale simple TBM hob adopts active drive instead of passive drive close to the actual working conditions, resulting in the test results Deviation from engineering reality

[0008] ②In the cutting test bench of a simple TBM hob with reduced scale, in order to quickly prepare a sample of a simple TBM hob with a reduced scale, the scale ratio is given directly based on literature data or subjective assumptions, and the ratio is applied to uniformly adjust the shape of the hob The size is simply reduced, that is, the prepared scaled-scale simple TBM hob sample has no connection with the actual hob, and it is impossible to reverse the actual engineering law based on the test results

[0009] ③ In the simple TBM hob cutting test bench with reduced scale, in order to quickly carry out the knife-rock grinding test, the cutting parameters such as hob depth of cut and hob wire cutting speed are selected directly based on literature data or subjective assumptions, that is, the carried out The knife rock grinding test is quite different from the actual kinematic characteristics and cutting load level of the hob, which cannot reflect the actual working conditions

Although the above-mentioned traditional methods can effectively use rock samples, due to the rock's brittleness, the rock has a step-breaking characteristic, which leads to the formation of uneven random rock faces after the first rolling and breaking of rocks, and the random rock faces lead to subsequent " It is difficult to maintain a constant depth of cut or cutting load when "reciprocating rolling and breaking rocks in a single slit", that is, in "reciprocating rolling and breaking rocks in a single slit", only the cutting state of the first rolling and breaking rocks is theoretically controllable, and the subsequent There is a large randomness in the cutting state of each rolling rock breaking, which makes it difficult for subsequent qualitative and quantitative analysis

[0011] ⑤In some scaled-scale simple TBM hob cutting test benches, the material performance of the scaled-down simple TBM hob sample is quite different from that of the actual engineering hob

[0012] ⑥Simple TBM hob cutting test bench in scaled scale is a non-standard test bench, which needs to be developed and customized separately, and has special components such as frame, transmission system, drive system, control system and clamping device. The structure is complex and the cost is high

Due to the lack of similarity theory guidance in the process of test bench design and cutting parameter selection, the biggest limitation of the scale-down simple TBM hob cutting test bench is that it is out of touch with the actual engineering and cannot reflect the real TBM tunneling environment. interaction mechanism

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