【摘要】 基于MICP方法，对风积沙进行固化试验，对沙质场地地基土进行加固，以提高地基土的力学特性。通过弯曲单元测试波在固化砂样中的传播速度，评价不同营养盐浓度、粒径级配和注浆批次对风积沙固化效果的影响，并用理论计算方式进行验证。研究结果表明：固化后的风积沙P波(纵波)大多分布在450～600 m/s, S波(横波)大多分布在350～500 m/s,与松散风积沙波速200 m/s相比，波速有了明显提高。营养盐浓度为0.75 mol/L时，风积沙固化效果较好。粒径级配控制在相对均匀的范围内(0.1～0.4 mm),砂样胶结程度更好，粒径过大或过小不利于加固。不同注浆批次对风积沙的固化效果影响较小。更多还原

【Abstract】 Based on MICP, test of the desert sands solidification was conducted. The effect of different nutrient salt concentration, particle size gradation and grouting batches on desert sands solidification was assessed by the wave speed in the sands. The research shows that the P-wave is about 45-600 m/s and S-wave is about 350-500 m/s after solidify the desert sands, compared with the wave speed 200 m/s of the loose sands. The nutrient concentration is 0.75 mol/L, the solidification of desert sands is better. The particle size gradation is controlled in a relatively uniform range(0.1-0.4 mm), the desert sands have a better cementation, and the particle size is too much large or small, which is not conducive to solidify the desert sands. It is of little effect that different grouting batches to solidify the desert sands.更多还原