Dynamic Mechanical Test and Microplane Model-based Simulation of MICP-treated Calcareous Sand

doi:10.12382/bgxb.2025.0155

Abstract

Abstract:

Microbially induced calcite precipitation (MICP) is effective to strengthen the calcareous sand foundation of reef fortifications via in-situ construction,dynamic response,and the dynamic characteristics and numerical model of MICP-treated calcareous sand are essential to the reef defense design and damage evaluation.The MICP cementation experiment is conducted on calcareous sand from the South China Sea.The strain rate effect of MICP-treated calcareous sand is evaluated through quasi-static uniaxial compression and dynamic mechanical testing of a split Hopkinson pressure bar (SHPB).A user subroutine VUMAT is developed based on the microplane model M7 for calibrating the material parameters.Compared with the calcareous sand penetration experiments,the numerical simulations demonstrate an increase in the penetration resistance of calcareous sand.The results reveal that the unconfined uniaxial compressive strength of MICP-treated calcareous sand specimen is 12.31MPa,and the dynamic increase factors are 1.117,1.485,and 1.828,respectively,at strain rates of 426s^-1,1150s^-1,and 1712s^-1 on the Hopkinson bar.Strain rate effect has a negative influence on the penetration depth of M7 constructive model by 4.2% DOP contribution.Compared with ordinary calcareous sand,the depth of penetration of MICP-treated calcareous sand is reduced by 40.11% on average,and the average target static resistance increases from 5.21MPa to 11.89MPa,indicating a significant increase in the resistance to penetration.These findings provide the experimental data and simulation model reference for damage analyses of reef fortifications subjected to high-impact loadings.

Key words: calcareous sand cementation, strain rate effect, microbially induced calcite precipitation, microplane model, anti-penetration performance

CLC Number:

TJ301

FENG Jun, SUN Weiwei, HUANG Jingnan, SUN Xichen, LI Yifan, DU Lufei, FU Jiawei. Dynamic Mechanical Test and Microplane Model-based Simulation of MICP-treated Calcareous Sand[J]. Acta Armamentarii, 2025, 46(11): 250155-.

Figures/Tables 24

References 26

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试件编号	撞击速度/(m·s^-1)	应变率/s^-1	抗压强度/MPa
S-2	6.65	426	16.50
S-3	10.95	1 150	21.94
S-4	22.91	1 712	27.01

试件编号	撞击速度/(m·s^-1)	应变率/s^-1	抗压强度/MPa
S-2	6.65	426	16.50
S-3	10.95	1 150	21.94
S-4	22.91	1 712	27.01

试件编号	应变率/s^-1	抗压强度/MPa	DIF
S-0	1.7×10^-3	12.31	1.000
S-1	1.2×10^-2	12.54	1.019
S-2	426	16.50	1.117
S-3	1150	21.94	1.485
S-4	1712	27.01	1.828

试件编号	应变率/s^-1	抗压强度/MPa	DIF
S-0	1.7×10^-3	12.31	1.000
S-1	1.2×10^-2	12.54	1.019
S-2	426	16.50	1.117
S-3	1150	21.94	1.485
S-4	1712	27.01	1.828

参数	取值	含义
E/GPa	20	参考弹性模量
c₁	0.089	控制单轴拉伸强度
c₂	0.176	控制单轴拉伸曲线峰值点处曲线圆度
c₃	4	控制单轴拉伸曲线峰值后软化段的斜率
c₄	50	控制单轴压缩曲线峰值后软化末端斜率
c₅	3 500	控制压缩体积膨胀
c₆	20	控制压缩体积膨胀峰值点处曲线圆度
c₇	1	控制单轴压缩曲线初始后峰的斜率
c₈	8	控制后压缩曲线峰值强度
c₉	0.012	控制单轴压缩曲线峰值点处的曲线圆度
c₁₀	0.33	控制有效摩擦系数
c₁₁	0.5	摩擦响应中的初始黏聚力
c₁₂	2.36	控制黏聚力随拉伸体积应变发生改变
c₁₃	4500	控制拉伸时的卸载斜率
c₁₄	300	控制低静水压力下的卸载斜率
c₁₅	4000	控制卸载斜率在强约束与弱约束之间过度
c₁₆	60	控制高静水压力下的卸载斜率
c₁₇	1.4	控制拉伸强度
c₁₈/MPa	62.5	控制压缩加载下的拉裂
c₁₉	1000	控制压缩引起的伸长软化率
c₂₀	1.8	控制高压下体积分量-偏分量耦合
c₂₁/MPa	250	控制体积应力-应变边界上限值