土遗址顶部风化层加固试验研究

摘要

There are drought and harsh natural environment in northwest China,and the surface weathering causes most earthen sites here disappearing gradually.The paper uses glutinous rice slurries and SH as injecting paste materials to reinforce the weak weathering layers on the top of earthen sites in site.After this reinforcement,the mechanical strength and durability are measured via a mini-penetrometer,an infrared imaging device and an acoustic-waves-monitor,adding to a simulation rain test.In addition,some supplementary tests have been done indoor to make remolded samples in order to compare with the experiment results of uniaxial resist compression,wave velocity,disintegration and field tests.The experiment results show that the SH reinforcement effects on strength and resistance to water-erosions of earthen sites' surface are better than those reinforced by glutinous rice slurries.When the grouting aperture reaches 25mm,the maximum infiltration radius can be obtained.After using concentration of 2％ of SH to reinforce,the strength is improved by 2.6 times,and the ability to resist disintegration is improved by 1.63 times.So the concentration of 2％ of SH is the optimum to be the anti-weathering material.%中国西北气候干旱,自然环境恶劣,表层严重风化使该地区土遗址逐渐消失殆尽.基于此,本文以糯米浆和SH作为注浆浆材在现场加固土遗址顶部薄弱风化层,通过微型贯入仪、红外热成像仪、声波仪等仪器及模拟雨淋试验检测加固后的力学强度特征及耐久性能.并在室内制作重塑样测量单轴抗压强度、波速、崩解速率与现场实验结果对比.结果表明,SH加固后的土遗址表面抗压强度、抗水侵蚀能力均优于糯米浆的加固效果.当注浆孔径为25mm时,各浓度浆液渗透半径最大.用2％SH浆液加固后,抗压强度提高了2.6倍,抗崩解能力提高了1.63倍,因此2％SH浆液可以作为防风化加固材料最佳选择.