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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (6): 1106-1114    DOI: 10.3785/j.issn.1008-973X.2020.06.007
土木工程     
基于HJC模型的盾构刀具切削混凝土数值模拟
苏伟林1,2(),李兴高1,2,*(),许宇2,3,金大龙1,2
1. 北京交通大学 城市地下工程教育部重点实验室，北京 100044
2. 北京交通大学 土木建筑工程学院，北京 100044
3. 中铁第一勘察设计院集团有限公司，陕西 西安 710043
Numerical simulation of shield tool cutting concrete based on HJC model
Wei-lin SU1,2(),Xing-Gao LI1,2,*(),Yu XU2,3,Da-long JIN1,2
1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
2. School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
3. China Railway First Survey and Design Institute Group Co. Ltd, Xi’an 710043, China
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摘要：

为了揭示盾构刀具切削混凝土材料时的阻力大小及变化规律，研究Holmquist-Johnson-Cook动态本构模型（HJC模型）参数的确定方法，并据此对混凝土受切削破坏过程进行数值模拟. 设计室内混凝土试块切削试验，根据试验结果对HJC模型参数进行修正，进一步计算分析切削速度与切削深度对切削阻力的影响. 研究表明，基于HJC模型的数值计算结果可基本反映盾构刀具切削混凝土的阻力大小及变化规律；刀具在切入混凝土表面时，法向切削阻力的波动幅度较大，在切削接近试块自由面时会出现剩余材料整块脱落、切削力骤降为0的现象，该过程在数值模拟中相对平缓；在相同条件下，率效应参数主要影响法向切削阻力的波动幅度，损伤参数则同时影响法向切削阻力的平均值与波动幅度；法向切削阻力随切削速度呈指数形式增加，随切削深度呈线性增加；HJC模型可反映混凝土压碎破坏与材料应变率间的关系及法向切削阻力随深度的线性叠加效应.
关键词： 盾构刀具;  混凝土切削;  HJC模型;  切削阻力;  数值计算    
Abstract:

The parameter determination of Holmquist-Johnson-Cook dynamic constitutive model (HJC Model) was analyzed, and the failure process of concrete under cutting was numerically simulated based on the HJC Model to reveal the cutting resistance and its variation when the concrete was cut by shield tools. A concrete block cutting test was designed to correct the parameters of the HJC Model, and then the influence of cutting speed and depth on cutting resistance were further studied. Results show that the calculation results of the numerical simulation based on HJC Model can preliminarily reflect the cutting resistance and its variation. The initial normal resistance fluctuates sharply when the cutting tool cuts into the concrete surface, while the remaining material will fall off and the cutting force will suddenly drop to zero when the cutting tool approaches the free surface of the test block, and this progress is relatively gentle in the numerical simulation. The rate effect parameter mainly affects the fluctuation range of normal cutting resistance, while the damage parameter affects both the average value and the fluctuation range. Normal cutting resistance increases exponentially with cutting speed and increases linearly with cutting depth. The HJC model can reflect the relationship between concrete crushing failure and material strain rate as well as the linear superposition effect of the normal cutting resistance due to the cutting depth.
Key words: shield cutting tool    concrete cutting    HJC Model    cutting resistance    numerical calculation
收稿日期: 2019-03-04 出版日期: 2020-07-06
CLC:  TU 921  
基金资助: 中央高校基本科研业务费专项资助（2019YJS144）
通讯作者: 李兴高     E-mail: suwelin@126.com;lixg@bjtu.edu.cn
作者简介: 苏伟林（1990—），男，博士生，从事盾构法隧道掘进研究. orcid.org/0000-0001-7022-6695. E-mail： suwelin@126.com
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引用本文:

苏伟林,李兴高,许宇,金大龙. 基于HJC模型的盾构刀具切削混凝土数值模拟[J]. 浙江大学学报(工学版), 2020, 54(6): 1106-1114.

Wei-lin SU,Xing-Gao LI,Yu XU,Da-long JIN. Numerical simulation of shield tool cutting concrete based on HJC model. Journal of ZheJiang University (Engineering Science), 2020, 54(6): 1106-1114.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.06.007    或    http://www.zjujournals.com/eng/CN/Y2020/V54/I6/1106

图 1  HJC强度模型
图 2  HJC损伤模型
图 3  HJC模型状态方程
图 4  HJC模型的关键字文件选项卡
图 5  HJC极限面与Mohr-Coulomb准则包络线
图 6  强度参数试验拟合
图 7  状态方程参数Hugoniot试验拟合
图 8  率效应参数C拟合
图 9  混凝土试块切削试验
参数类型 符号 数值 单位
基本参数 ρ 2110 kg/m3
G 8.75×103 MPa
T 1.62 MPa
fc 24.45 MPa
率效应参数 C 0.012 ?
ESP0 1.0 ?
强度参数 A 0.272 ?
B 1.50 ?
N 0.87 ?
SFMAX 20 ?
状态方程参数 p1 1.78×103 MPa
pc 8.15 MPa
μl 0.16 ?
μc 6.99×10?4 ?
K1 9.23 GPa
K2 141.24 GPa
K3 136.50 GPa
损伤参数 D1 0.04 ?
D2 1.0 ?
EFMIN 0.01 ?
表 1  混凝土HJC模型参数取值
图 10  混凝土切削受力分析示意图
图 11  混凝土切削有限元模型
图 12  混凝土切削塑性区动态分布
图 13  法向切削阻力随时间变化曲线
图 14  应变率影响参数取不同值时法向切削阻力随时间变化曲线
图 15  损伤常数取不同值时法向切削阻力随时间变化曲线
图 16  不同切削速度时法向切削阻力随时间变化曲线
图 17  法向切削阻力均值随切削速度变化曲线
图 18  不同切削深度时法向切削阻力随时间变化曲线
图 19  法向切削阻力随切削深度变化曲线
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