土遗址裂隙注浆浆-土界面粘结性能干旱环境耐久性对比

Comparison of bond performance between grouting slurry and soil interface in soil sites and durability in arid environment

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。

Aiming at the durability of the slurry-soil interface in arid environment under the synergistic effect has become an urgent need for its promotion and application in the field of crack repairs in earthen ruins.Important support sought.The undisturbed site soil was used to carry out indoor simulated fissure grouting with or without pile-mortar synergistic mode,and conducts dry-wet,freeze-thaw,salt-tolerant and alkali-tolerant 4 types of the grout-soil interface formed in different modes for durability test in arid environment.Wave speed measurement and interface direct shear test are carried out on samples at different ages,and the slurry-soil interface bonding is revealed by comparing and analyzing its wave speed,interface mechanical parameters,interface failure mode and shear stress-displacement relationship.The characteristics and laws of performance degradation in arid environment.Results show that the failure form of the interface during the entire age is mainly the bonding failure of the flat interface and the combined failure of the bonding and incisor failure of the undulating interface;under any durability condition,the grout-soil under the four grouting modes(the interface wave speed,surface residual soil thickness,peak shear stress,and interface shear strength parameters)all show a downward trend with the increase of age,and the size relationship is all expressed as grouting with lime piles and grooves>grouting with grooves>grouting with lime piles>grouting alone;the above rules all show that the durability of the dry environment durability of the pile-mortar synergistic bond between the grout-soil interface of the soil ruins is significantly better than the single grouting mode.