Study on disc cutter chipping of TBM based on field data and particle flow code simulation  

作　　者：Yadong Xue Yongqiang Fan Xing Li Kai Shen Jiaxuan Wang 

机构地区：[1]Key Laboratory of Geotechnical and Underground Engineering of Education Ministry,Tongji University,Shanghai 200092,China [2]Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China [3]China State Construction Silkroad Construction Investment Group Co.,LTD,Xi’an 710075,China [4]School of Civil Engineering,Central South University,Changsha 410075,China

出　　处：《Underground Space》2023年第2期122-139,共18页地下空间（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52078377);the Key Field Science and Technology Project of Yunnan Province(Grant No.202002AC080002);supported by the China Atomic Energy Authority(CAEA)through the Geological Disposal Program.

摘　　要：Using tunnel boring machines to excavate high-strength intact rock masses is becoming more common.Due to the interactions between disc cutters and rocks,abnormal wear of disc cutters,especially cutter chipping,has become a common phenomenon.Existing research has mainly focused on normal wear of disc cutters without addressing abnormal wear cases.This study used the disc cutter consumption data of a tunnel project in China to investigate the abovementioned problem based on field research.According to the fail-ure patterns and fracture surface characteristics,the cutter chipping patterns were mainly categorized into four types:granule chipping,patch chipping,primary collapse,and secondary collapse.To further simulate the evolution of disc cutter chipping,based on the linear plastic bond model,a new contact model called the modified plastic bond(MPB)model was proposed to solve the metal simulation prob-lem in Particle Flow Code software.To this end,a set of uniaxial tensile and compressive tests were initially conducted to verify the applicability of the MPB model.Then,a series of three-dimensional rock-cutting simulation tests were conducted to reflect the evolu-tionary processes involved in each type of cutter chipping.The cutter chipping mechanism and morphological characteristics were clas-sified and summarized in detail.The results revealed that the cutting speed and penetration growth led to a rising trend in the probability and intensity of the cutter chipping.The presence of initial defects also induced an adverse effect on the service life of the cutter.The results indicated suitable working conditions for the cutter and suggested ways to control tunneling parameters and avoid frequent cutter chipping cases.

关 键 词：Tunnel boring machine Disc cutter Cutter chipping Particle flow code Modified plastic bond model 

分 类 号：U45[建筑科学—桥梁与隧道工程]