Sciences in Cold and Arid Regions ›› 2020, Vol. 12 ›› Issue (3): 134-143.doi: 10.3724/SP.J.1226.2020.00134

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Numerical simulations on cutting of frozen soil using HJC Model

WenQiang Zhang1,2,YongHong Niu1()   

  1. 1.State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-10-23 Accepted:2020-04-14 Online:2020-06-30 Published:2020-06-29
  • Contact: YongHong Niu E-mail:yhniu@lzb.ac.cn

Abstract:

Numerical simulation is known as an effective method for mechanical properties during frozen soil excavation. In order to reveal the development of cutting force, effective stress and cutting fragments in frozen silt during the cutting process, we introduce an explicit finite element program LS-DYNA to establish a two-dimensional numerical model of the frozen soil cut. We also use the Holmquist-Johnson-Cook (HJC) damage constitutive model for simulating the variation of soil mechanical properties according to the strong dependence between the cutting tool and frozen silt during the process with different cutting depths, angles and velocities. Meanwhile, a series of experimental results are acquired of frozen silt cutting to prove the application of the HJC model during simulation of cutting force variations. The result shows that the cutting force and fragment size are strongly influenced by cutting depths and cutting velocities increased, and the maximum effective stress at points where the tool contacts frozen soil during the cutting process. In addition, when the cutting angle is 52°, the cutting force is the smallest, and the cutting angle is optimum. Thus, the prediction of frozen soil mechanical properties on the cutting process by this model is conducive to selecting machinery equipment in the field.

Key words: frozen soil cutting, numerical simulation, HJC damage constitutive model, mechanical properties

Figure 1

Relation between hydrostatic pressure and volume strain in HJC model"

Figure 2

Model of 2-D rotary cutting for frozen soil"

Table 1

Selection of tool parameters"

Materialρ0 (kg/m3)E (Pa)ν
Cutting tool7,8302.10E+110.25

Table 2

Selection of HJC Model parameters"

ParametersValueParametersValue
ρ0 (kg/m3)2052T (Pa)8.00E+05
G (Pa)7.78E+09Pc (Pa)2.67E+06
fc' (Pa)8.00E+06μc0.0013
A2.5Pl (Pa)3.00E+08
B1.5μ10.15
N0.5K1 (Pa)5.00E+10
C0.124K2 (Pa)-1.57E+11
Smax5K3 (Pa)5.80E+09
D10.08ε0·1.00E-06
D21fs0.5
?fmin0.06

Figure 3

Effect of parameter A on cutting force of frozen soil"

Figure 4

Effect of parameter B on cutting force of frozen soil"

Figure 5

Effect of parameter fs on cutting force of frozen soil"

Figure 6

Evolution diagram of effective stress in frozen soil under different cutting depths"

Figure 7

Maximum effective stress vs. cutting depths"

Figure 8

The curve of cutting force of frozen soil with cutting depths"

Figure 9

Evolution diagram of effective stress in frozen soil under different cutting angles"

Figure 10

Maximum effective stress vs. cutting angles"

Figure 11

The curve of cutting force of frozen soil with cutting angles"

Figure 12

Evolution diagram of effective stress in frozen soil under different cutting velocities"

Figure 13

The curve of cutting force of frozen soil with cutting velocities"

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