Study on interface shear strength between polyurethane treated and original Pisha sandstone under dry-wet cycles

作者：Wenbo Ma, Xuan Zhou, Jiaping Li, Yanli Chen, Yuyang Li, Caiqian Yang, Minke Ma, Jiale Long, Shuaicheng Guo · 发表于：Journal of Traffic and Transportation Engineering (English Edition) · 年份：2025 · DOI：10.1016/j.jtte.2021.12.007 · 被引用次数：3 · 研究领域：Grouting, Rheology, and Soil Mechanics、Geotechnical Engineering and Soil Stabilization、Geotechnical Engineering and Underground Structures

Currently, utilization of hydrophilic polyurethane (W-OH) materials for slope protection in arid areas has proved to be a cost-effective protocol. The treatment effect highly depends on the interfacial performance between the W-OH treated and the original sandstone. This study aims to investigate the corresponding shear strength and its long-term performance under dry-wet cycles under the arid environment. The results from the direct shear test indicate the interface shear strength increases with W-OH solution concentration and decreases with the increase of water content of the Pisha sandstone. Further investigations under dry-wet cycles indicate the interface cohesion is obviously weakened by the dry-wet cycles, while the influence on the internal friction angle is not obvious. The correlation between the degradation level and the dry-wet cycles can be well fitted with the inverted S-curve using two combined exponential functions. Furthermore, the ethylene-vinyl acetate (EVA) content is utilized to enhance the durability performance under dry-wet cycles. It is found the EVA can obviously improve the bonding property and the resistance to dry-wet cycles. This study's results can serve as a solid base for the application of W-OH materials to resolve the soil erosion in the arid region. • Examining the dry-wet resistance at the interface between PU stabilized and original Pisha sandstone. • Establishing a non-destructive protocol with the ultra-depth-of-field microscope for in...