土遗址裂隙注浆用SH-(C+F+CaO)浆液耐久性试验研究

Researches on the durability of the SH-(C+F+CaO) slurry applied to reinforce the cracks in earthen sites

为探索适应于西北地区土遗址裂隙加固灌浆材料,以SH溶液为主剂,粉煤灰、土遗址原生土与生石灰拌合为灌浆材料,测试浆体的收缩变形性、龄期强度,通过温湿度循环试验、冻融循环试验、水稳定性试验、安定性试验和耐碱性试验,对浆体耐久性进行评价,此外,通过室内模拟裂隙注浆,研究浆-土界面之间的抗剪特性。试验数据表明,SH-(C+F+Ca O)浆体具有较小的收缩变形性,较强的力学性能、良好的耐久性,尤其适用于西北地区特有的碱性环境中;而硫酸钠对其有一定的弱化效应,在高浓度的硫酸钠土遗址地区应慎用,浆–土界面抗剪强度与土遗址原状样相当。研究表明,此浆液适宜作为西北地区土遗址裂隙注浆材料。

In order to explore the the grouting material which is suitable to reinforce the soil cracks in Northwest region site,We try to use a new material which is a mixture of SH-（rammed earth clay ＋ fly ash ＋ Ca O）（SH-（C＋F＋Ca O））.Through a serial of tests,learn about it＇s Slurry shrinkage deformation and aging strength. The durability of the slurry is evaluated through the temperature and humidity cycle test,the freeze-thaw cycle test,water stability test,stability test and the alkali resistance test. The shear characteristics of slurry-soil interface is estimated through the indoor simulation fracture grouting.The test results indicate that SH-（C＋F＋Ca O） material has less shrinkage deformation,strong aging strength and good durability,and especially suitable for the Northwest region-specific alkaline environment. However,sodium sulfate weaken the material strength,so the material should be used with caution in the area of high concentration sodium soil sites. The shear strength of slurry-soil interface is strong as well as the undisturbed samples. The study shows that this material is suitable as northwest earthen crack grouting material.