Method for predicting accumulated mass loss rate of heading machine cutter

Abstract

The invention belongs to the technical field of underground tunnel engineering construction and provides a method for quantitatively predicting the cutter abrasion quality of the heading machine cutter during composite stratum heading. On the basis of tool mass measurement and corresponding tool and tunnel face contact point trajectory calculation, mass line loss indexes MLI of tools at differentpositions are subjected to classification statistics according to strata. After the MLI is normalized into equivalent mass line loss indexes EMLI, a universal prediction model for the equivalent massline loss indexes of homogeneous strata is obtained. The MLI and the corresponding EMLI are clear in physical significance. The equivalent mass line loss index universal prediction model considers both the shareability of independent variables and the prediction precision. The cutter wear quality prediction method based on the equivalent mass line loss index general prediction model is provided. The calculation process is simple and clear. The prediction precision is high. Based on engineering investigation data and construction data, the method is reasonable, high in practicability and beneficial to quantitatively predicting the tool abrasion state, scientifically and reasonably arranging bin opening and tool changing and improving the tunneling efficiency.

Description

technical field [0001] The invention belongs to the technical field of predicting tool wear amount of a full-section tunnel boring machine, and in particular relates to a method for predicting the cumulative mass loss rate of a boring machine tool based on a mass line loss index. Background technique [0002] Full-face tunnel boring machines, including TBM and various types of tunnel boring machines, are currently the main equipment for tunnel excavation in complex stratum environments. The spindle drives the cutter head to rotate to drive the cutter on the cutter head to apply shear stress and friction to the face, and the hydraulic jack pushes the cutter on the cutter head to apply normal stress to the face to crush and cut the face. The purpose of cutting soil and breaking rock. [0003] At present, tool wear is mainly realized through theoretical methods and statistical methods. Theoretical method is based on force analysis, but the mechanism of rock fracture and tool ...

AI Technical Summary

Problems solved by technology

[0004] 1 (prediction and calculation method of disc hob wear of roadheader, application number: CN201110068077) and 2 (prediction method of wear condition of constant section disc hob of rock tunnel boring machine, application number: CN201710910463) establish and calculate by theoretical analysis method method, there are many key parameters in the theoretical formula, which are difficult to measure reliably and accurately in scientific research and production, and the calculation method is only applicable to the case of homogeneous face

[0005] 3 (The method of predicting the wear amount of a disc hob using the life coefficient, application number: CN201410386557) According to the principle of kinematics, a theoretical method for calculating the wear depth of a disc hob is proposed, but according to the definition of the life coefficient, this method only It is applicable to the situation that the hob is always moving in the same homogeneous stratum, and the angular velocity of the cutterhead is constant, but the angular velocity of the cutterhead in actual engineering changes. Assume that the angular velocity of the cutterhead is constant within one revolution to calculate the arc length of the hob , the deviation is very large

[0006] 4 (A TBM Hob Wear Prediction Method Based on CAI Value, Application No.: CN201610976332) Each step mostly contains coefficients that need to be obtained according to laboratory test statistics, and the load conditions, boundary conditions, and thermodynamics of the samples in the test Conditions and sites vary greatly, and the practicability of the method is poor

[0007] 5 (Real-time calculation method of disc hob wear amount of hard rock tunnel boring machine, application number: CN201510617860) The calculation method of wear depth is obtained by theoretical method, but the hob wear depth and the installation radius of the hob on the cutter head are linear relationship, the assumption is inconsistent with the actual situation, and it is not universally applicable to the excavation full-face homogeneous stratum

[0008] 6 (a method for estimating the weight and wear of hard rock tunnel boring machine constant section disc hobs, application number: CN201610771253) and 7 (a real-time detection method for the wear status of hard rock tunnel boring machine constant section disc hobs, application number : CN201811061640) Predict the weight wear of the hob through the theoretical method based on the CAI value, which is only suitable for wear prediction when excavating homogeneous strata, and is not suitable for other types of tools such as scrapers

When the rock type in the rock-breaking area of ​​the hob on the face changes, it is necessary to re-statize and calculate the new comprehensive wear coefficient of the cutter ring, and the method is not universal

[0010] 9 (a method for determining the hob wear amount of shield tunneling in composite strata, application number: CN201711426745) and 10 (a layered summation method for predicting hob wear amount by using the wear specific consumption index, application number: CN201710366565) only consider the effect of the tool The impact of the thickness and volume of the annular area on the tool wear is not analyzed for the length of the cutting path of the tool. However, when the rock-breaking volume is constant, increasing the speed of the cutter head and increasing the length of the tool track will lead to a significant increase in the wear. Therefore, the statistical results of the physical Weak meaning and large error

[0011] The method of predicting the wear amount (wear depth) of the hob can only predict the wear depth of the tool in a uniform wear state, but in practice, the tool is almost all non-uniform wear, that is, partial wear, and this method cannot study the difference in wear at different positions on the tool , so they are not suitable for the occurrence of eccentric tool wear, and the theoretical method of predicting wear quality is difficult to consider the combined effect of complex factors in actual excavation

Images