温度对自膨胀高聚物浆液在裂隙中扩散行为影响试验研究  

Experimental study on influences of temperature on diffusion behaviors of self-expanding polymer slurry in fractures

作　　者：贾赫扬 李晓龙[1,2] 曹东东 王珊珊 桂云祥 钟燕辉 张蓓[1,2] JIA Heyang;LI Xiaolong;CAO Dongdong;WANG Shanshan;GUI Yunxiang;ZHONG Yanhui;ZHANG Bei(College of Hydraulic and Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou 450001,China;Henan Water&Power Engineering Consulting CO.,Ltd.,Zhengzhou 450016,China)

机构地区：[1]郑州大学水利与土木工程学院,河南郑州450001 [2]重大基础设施检测修复技术国家地方联合工程实验室,河南郑州450001 [3]河南水利勘测设计研究有限公司,河南郑州450016

出　　处：《岩土工程学报》2024年第4期794-802,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52178401);河南高校科技创新团队支持计划项目(23IRTSTHN014);河南省2021年水利科技攻关项目(72);中原英才计划项目(234200510014)。

摘　　要：为了研究温度对膨胀型聚氨酯高聚物注浆材料在裂隙中扩散特性的影响,设计了平板裂隙注浆模型试验装置,以一种工程中应用的聚氨酯高聚物浆液为对象,开展了高聚物注浆系列试验,测试了不同浆液预热温度、环境温度、注浆量条件下高聚物浆液在平板裂隙中的扩散特性,得到了不同工况下浆液扩散速率、扩散范围以及浆液和裂隙壁内温度分布随时间变化情况。分析结果表明:浆液预热温度对高聚物扩散过程具有重要影响,相同注浆量条件下,预热温度越高,浆液扩散速率越快,初凝时间越早,浆液扩散半径随着预热温度的升高逐渐增大,低温下浆液扩散半径显著低于高温下的试验结果;浆液扩散过程与其化学反应进程不完全同步,其化学反应终止时间晚于浆液初凝时间;浆液温度随时间呈现先升高然后逐渐下降、变化速率由快至慢的演化特征,同一时刻注浆孔中心处温度最高,沿径向逐渐递减;浆液升温速率和温度峰值随预热温度和环境温度的升高而增大;浆液扩散过程中高聚物与裂隙壁间存在明显热传导效应。试验结果对于高聚物裂隙注浆机理研究和注浆技术研发具有参考作用。In order to study the influences of temperature on the fracture diffusion characteristics of expansive polyurethane polymer grouting materials,a plate fracture grouting model test device is designed.With a polyurethane polymer slurry applied in engineering as the research object,a series of polymer grouting tests are carried out.The diffusion characteristics of polymer slurry in plate fractures under different slurry preheating temperatures,ambient temperatures and grouting amounts are tested.The changes of slurry diffusion rate,slurry diffusion range,and temperature distribution of slurry and fracture wall under different working conditions are obtained.The analysis results show that the preheating temperature of slurry has an important influence on the diffusion process of polymer.Under the same grouting amount,the higher the preheating temperature,the faster the slurry diffusion rate and the earlier the initial gel time.The slurry diffusion range gradually increases with the increase of the preheating temperature.The slurry diffusion radius at low temperatures is significantly lower than the test results at high temperatures.The slurry diffusion process is not synchronized with the chemical reaction process,and the chemical reaction termination time is later than the initial gel time.The slurry temperature firstly rises and then gradually decreases with time,and the change rate is from fast to slow.At the same time,the temperature at the center of the grouting hole is the highest and gradually decreases along the radial reaction.The rising rate and peak value of slurry temperature increase with the increase of the preheating temperature and ambient temperature.There is an obvious heat conduction between the slurry and the fracture wall during the process of slurry diffusion.The test results can be used as a reference for the researches on the polymer fracture grouting mechanism and grouting technology.

关 键 词：高聚物 裂隙注浆 扩散机理 温度 试验 

分 类 号：TU45[建筑科学—岩土工程]