Study on the influence law of TBM disc cutter penetration on the rock-breaking efficiency

被引：0

作者：

Ji G. ^{[1
,2
]}

Fu B. ^{[3
]}

Zhang H. ^{[3
]}

Geng Q. ^{[4
]}

Wang L. ^{[1
,3
]}

Wang C. ^{[5
]}

Hu H. ^{[6
]}

机构：

[1] China Railway 18th Bureau Group Co., Ltd, Tianjin

[2] School of Civil Engineering, Tianjin University, Tianjin

[3] School of Civil Engineering, Southwest Jiaotong University, Chengdu

[4] School of Construction Machinery, Chang’an University, Xi’an

[5] China Railway 18th Bureau Group Municipal Engineering Co., Ltd., Tianjin

[6] China Railway 18th Bureau Group Tunnel Engineering Co., Ltd., Chongqing

来源：

Journal of Railway Science and Engineering | 2023年 / 20卷 / 12期

关键词：

numerical simulation; penetration; rock-breaking test; specific energy; TBM disc cutter;

D O I：

10.19713/j.cnki.43-1423/u.T20230089

中图分类号：

学科分类号：

摘要：

Reasonable setting of TBM penetration parameters is very important for the excavation efficiency under specific geological conditions. To study the rock-breaking effect of TBM disc cutter at different penetration, the linear cutting test of disc cutter on granite were carried out under different boundary conditions by using the self-developed rock-breaking scale test platform. By using FEM (finite element method) and SPH (smooth particle hydrodynamics) coupled numerical simulation method, the related experiments were reproduced to verify the rationality of the model. On this basis, a three-dimensional numerical model of rock-breaking with full-scale double disc cutter was established to study the rock-breaking effect of TBM disc cutter on granite under different penetration degrees. The results show that the force and volume of rock ballast of disc cutter under lateral restraint are often larger than those without lateral restraint, and the increase amplitude of normal force and rock ballast between adjacent penetration degrees decreases with the increase of penetration degrees, but the rock-breaking efficiency is higher under unconfined condition. The rock-breaking process of the disc cutter is a step change, and the generation of the rock ballast is mainly concentrated in the normal force drop stage of the disc cutter. No matter whether there are restrictions on the disc cutter side, the rock under the disc cutter is crushed to extremely fine powder, the rock on the disc cutter side collapses, and the size of the rock ballast is positively correlated with the disc cutter load drop amplitude. The failure of rock area under the cutter is approximately“V” shaped, and the“V”shaped failure area between two disc cutters continuously inclines to the inside of installation radius with the increase of penetration. The rock-breaking efficiency of disc cutter increase first and then decreases with the increase of penetration, and the optimal penetration is 2～4 mm for the test rock sample. The method of combining rock-breaking scale test with FEM-SPH numerical simulation in this research can reproduce the granite-breaking process well, and the relative error of cutting force of both methods is within 10%, which can provide some reference for the subsequent research of rock-breaking by TBM disc cutter. © 2023, Central South University Press. All rights reserved.

引用

页码：4755 / 4768

页数：13

共 18 条

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