吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (10): 2856-2868.doi: 10.13229/j.cnki.jdxbgxb.20211325
Kai CUI1(),Peng-fei XU1,Jing-jing HUANG2,Xiang-peng YU1,Xiao-hai WANG1
摘要:
针对协同作用下浆-土界面干旱环境耐久性问题,采用原状遗址土进行4种有无桩-浆协同作用模式下的室内模拟裂隙注浆,对不同模式下所形成的浆-土界面进行干湿、冻融、耐盐和耐碱4种典型干旱环境耐久性试验,在不同龄期对试样进行波速测量和界面直剪试验,通过对比分析其波速、界面力学参数、界面破坏模式以及剪切应力-位移关系来揭示浆-土界面粘结性能在干旱环境下的劣化特征与规律。研究表明:整个龄期界面的破坏形式以平直界面的粘结破坏和起伏界面的粘结与切齿联合破坏为主;在任意一种耐久性条件下,4种注浆模式下的浆土-界面的波速、表面残留土体厚度、峰值剪应力、界面抗剪强度参数均随龄期增加呈下降趋势,且大小关系均表现为起伏有桩模式>起伏无桩模式>平直有桩模式>平直无桩模式;以上规律均表明桩-浆协同下土遗址裂隙浆-土界面粘结性能的干旱环境耐久性能明显优于单独注浆模式。
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