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 

机构地区：[1]College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China [2]School of Civil Engineering,Southeast University,Nanjing 21189,China [3]Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering,Hunan University,Changsha 410082,China [4]Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education,College of Civil Engineering,Hunan University,Changsha 410082,China

出　　处：《Journal of Traffic and Transportation Engineering(English Edition)》2025年第1期108-122,共15页交通运输工程学报(英文版)

基　　金：financially supported by the National Key R&D Program of China(2017YFC0504505);High-level Talent Gathering Project in Hunan Province(2019RS1059);the financial support provided by Open Fund of Key Laboratory of Road Structure and Material of Ministry of Transport,Changsha University of Science&Technology(kfj180302)。

摘　　要：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 Scurve 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.

关 键 词：W-OH polyurethane Pisha sandstone slope Dry-wet cycles Direct sheartest Interface strength Ethylene-vinyl acetate 

分 类 号：TU411[建筑科学—岩土工程]