Numerical simulation of shield tool cutting concrete based on HJC model

doi:10.3785/j.issn.1008-973X.2020.06.007

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (6): 1106-1114 DOI: 10.3785/j.issn.1008-973X.2020.06.007

Civil Engineering

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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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

Received: 04 March 2019 Published: 06 July 2020

CLC:

TU 921

Corresponding Authors: Xing-Gao LI E-mail: suwelin@126.com;lixg@bjtu.edu.cn

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Cite this article:

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.

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

基于HJC模型的盾构刀具切削混凝土数值模拟

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

Fig.1 HJC strength Model

Fig.2 HJC damage Model

Fig.3 State equation in HJC Model

Fig.4 Keyword file tab of HJC Model

Fig.5 HJC limit surface and Mohr-Coulomb criterion envelope

Fig.6 Strength parameters fitted by test data

Fig.7 State Equation parametesr fitted by Hugoniot test data

Fig.8 Rate effect parameter C fitting

Fig.9 Cutting test of concrete specimens

Tab.1 Parameter value of concrete HJC constitutive model

Fig.10 Diagram for force analysis of cutting concrete

Fig.11 Finite element model of concrete cutting

Fig.12 Plasticity dynamic distribution in concrete cutting

Fig.13 Normal cutting resistance changes with time

Fig.14 Change of normal cutting resistance with time for different values of strain rate parameter

Fig.15 Change of normal cutting resistance with time for different values of damage parameter

Fig.16 Change of normal cutting resistance with time for different cutting speeds

Fig.17 Average normal cutting resistance changes with cutting speed

Fig.18 Change of normal cutting resistance with time for different cutting depths

Fig.19 Average normal cutting resistance changes with cutting depth


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