W-OH材料对花岗岩残积土崩解特性的影响

Influence of W-OH Material on the Disintegration Characteristics of Granite Residual Soil

花岗岩残积土在遇水后极易发生崩解劣化现象,从而诱发崩塌、滑坡及冲蚀等地质灾害,影响道路、桥梁及隧道工程等施工进展,对人们的生命财产构成威胁。基于此,以花岗岩残积土为研究对象,通过室内崩解试验,研究了W-OH(改性亲水性聚氨酯)的溶液浓度和喷洒量对花岗岩残积土崩解过程、崩解率及崩解速率等崩解特性的影响。结果表明:经W-OH溶液在花岗岩残积土表面喷洒处理后,通过产生对土颗粒的胶结包裹作用和凝结固化后生成多孔弹性薄膜的约束作用,能有效改善花岗岩残积土的抗崩解性;W-OH溶液对花岗岩残积土抗崩解性的提升程度,总体上和W-OH的溶液浓度和喷洒量呈现正相关关系;随着WOH溶液浓度和喷洒量的增加,花岗岩残积土完全崩解的时间逐渐延长,崩解速率逐渐降低。研究成果可为W-OH材料改良花岗岩残积土的实际工程应用提供借鉴和参考。

The granite residual soil is prone to disintegration and degradation after encountering water,inducing geological disasters such as collapse,landslide and erosion,affecting the construction progress of road,bridge and tunnel projects,and threatening the life safety of people around.Based on this,taking granite residual soil as the research object,the effects of solution concentration and spraying amount of W-OH(modified hydrophilic polyurethane) on the disintegration process,disintegration amount and disintegration rate of granite residual soil were investigated through laboratory disintegration test.The results show that the treatment by W-OH solution sprayed on the surface of granite residual soil can effectively improve the resistance to disintegration of granite residual soil by producing the binding and wrapping effect on soil particles and the restraining effect of generating porous elastic film after condensation and solidification.The degree of enhancement of W-OH solution on the anti-disintegration property of granite residual soil showed a positive correlation with the solution concentration and spraying amount of W-OH in general.With the higher concentration solution and spraying volume of W-OH,the complete disintegration time of granite residual soil was longer and the disintegration rate was alleviated to a greater extent.The research results can provide some reference for the practical engineering application of W-OH material for improving granite residual soil.