二次注浆钢花管微型桩加固边坡的试验研究

Experiments on Slope Reinforced with Micropiles with Secondary Pressure Grout

为探讨二次注浆对钢花管微型桩施工效果的影响,开展了二次压力注浆钢花管微型桩加固边坡的现场试验,分析了二次注浆压力的特性,研究结果表明:劈裂压力、持续压力、岩土体挤裂压力能够反映出二次注浆的机理和效果,可作为二次注浆的控制性指标;全风化页岩地层二次注浆可分为二次注浆未劈裂型、二次注浆短期孔口冒浆型、二次注浆未出现挤裂压力型、二次注浆出现挤裂压力型4类。

This paper presents an investigation into the effect of secondary grout on the micropiles performance. A large number of in situ tests were performed on the slope stability mitigation reinforced with micropiles with secondary pressure grout. The characteristics of secondary pressure grout were evaluated. The results demonstrate that splitting pressure, continuous pressure and rock-soil cracking pressure can reflect the mechanisms and the effects of secondary pressure grout. These factors can be considered as the control indicators for the secondary pressure grout. The secondary pressure grout acting on the fully weathered shale formation can be divided into four categories: secondary pressure grout without splitting, secondary pressure grout with short-term slurry injection, secondary pressure groutwithout crushing pressure and secondary pressure grout with crushing pressure.