Shen Mengqiang, Zhang Zhichao, Qi Changguang, Lu Yihan, Zheng Rongyue
School of Civil and Environmental Engineering, Ningbo University, 818 Fenghua Road, Ningbo, 315211, China.
Senior Engineer, Key Laboratory of Geohazard Prevention of Hilly Mountains & Ministry of Natural Resources of China, Fujian Geological Engineering Survey Institute, 145 West Yangqiao Road, Fujian, 350002, China.
Sci Rep. 2024 Nov 18;14(1):28510. doi: 10.1038/s41598-024-79541-6.
This study investigates the shear strength characteristics of mudstone gravel slope following polymer grouting reinforcement through in-situ direct shear test. A corresponding numerical model was developed to analyze stress distribution. The findings indicate that shear stress initially increases and then stabilizes with horizontal displacement during the pre-grouting shear test. Post-grouting, a distinct stress peak emerges on the stress-displacement curve, signifying a substantial enhancement in overall shear strength. The peak shifts with increasing vertical stress, delaying the onset of yield strength. Moreover, a direct correlation exists between shear strength and the density of grout injected. Numerical simulations reveal an H-shaped stress distribution around the shear plane. Upon severing the grouting column, the stress distribution becomes intricate, with stress appearing to circumvent the column. The discrepancy between simulation and experimental data is minimal, with the simulated internal friction angle deviating by -0.97-1.5% from the experimental values and the simulated cohesion being marginally lower, with an error range of 3.9-5%. These results offer valuable insights for engineering applications.
本研究通过现场直剪试验，对聚合物注浆加固后的泥岩碎石边坡抗剪强度特性进行了研究。建立了相应的数值模型来分析应力分布。研究结果表明，在注浆前的直剪试验中，剪应力随水平位移先增大后稳定。注浆后，应力-位移曲线上出现明显的应力峰值，表明整体抗剪强度有显著提高。峰值随垂直应力的增加而移动，延迟了屈服强度的出现。此外，抗剪强度与注浆密度之间存在直接相关性。数值模拟揭示了剪切面周围呈H形的应力分布。切断注浆柱后，应力分布变得复杂，应力似乎绕过了注浆柱。模拟数据与实验数据之间的差异很小，模拟的内摩擦角与实验值的偏差为-0.97 - 1.5%，模拟的黏聚力略低，误差范围为3.9 - 5%。这些结果为工程应用提供了有价值的见解。
