Three Gorges Research Center for Geo-hazards of Ministry of Education, China University of Geosciences, Wuhan 430074, China.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China.
Int J Environ Res Public Health. 2020 Dec 3;17(23):9032. doi: 10.3390/ijerph17239032.
The study of the high-performance of biopolymers and current eco-friendly have recently emerged. However, the micro-behavior and underlying mechanisms during the test are still unclear. In this study, we conducted experimental and numerical tests in parallel to investigate the impact of different xanthan gum biopolymer contents sand. Then, a numerical simulation of the direct tensile test under different tensile positions was carried out. The micro-characteristics of the biopolymer-treated sand were captured and analyzed by numerical simulations. The results indicate that the biopolymer can substantially increase the uniaxial compressive strength and tensile strength of the soil. The analysis of the microparameters demonstrates the increase in the contact bond parameter values with different biopolymer contents, and stronger bonding strength is provided with a higher biopolymer content from the microscale. The contact force and crack development during the test were visualized in the paper. In addition, a regression model for predicting the direct tensile strength under different tensile positions was established. The numerical simulation results explained the mechanical and fracture behavior of xanthan gum biopolymer stabilized sand under uniaxial compression, which provides a better understanding of the biopolymer strengthening effect.
生物聚合物的高性能研究和当前的环保意识最近已经出现。然而，在测试过程中的微观行为和潜在机制仍然不清楚。在这项研究中，我们进行了实验和数值测试的平行研究，以调查不同黄原胶生物聚合物含量对沙的影响。然后，对不同拉伸位置下的直接拉伸试验进行了数值模拟。通过数值模拟捕捉和分析了生物聚合物处理后的沙的微观特征。结果表明，生物聚合物可以显著提高土壤的单轴抗压强度和拉伸强度。微观参数的分析表明，随着生物聚合物含量的不同，接触粘结参数值增加，并且从微观尺度来看，更高的生物聚合物含量提供了更强的粘结强度。本文还可视化了测试过程中的接触力和裂缝发展。此外，还建立了预测不同拉伸位置下直接拉伸强度的回归模型。数值模拟结果解释了黄原胶生物聚合物稳定砂在单轴压缩下的力学和断裂行为，为更好地理解生物聚合物的强化效果提供了依据。
