散粒体斜坡注浆固坡工程防治技术实验研究

PHYSICAL MODEL TESTS ON THE GROUTING SAND CONSOLIDATION ENGINEERING FOR SLOPE WITH GRANULAR MIXTURES

目前,国内外对散粒体斜坡的防治措施研究甚少。笔者推荐注浆固坡工程防治技术,具有"以动制动"特点。本文通过室外注浆物理模拟实验,得出注浆后固结体形态有舌形、灵芝形、柱形、长倒锥形、短倒锥形,其有效半径分别是46.3cm、26cm、21.4cm、16.5cm、40cm、29.4cm。结合现场颗粒取样筛分实验,研究了散粒体堆积结构对注浆固坡措施的影响,提出颗粒间孔隙比的影响最为主要,并通过计算机优化回归得出注浆量及浆液扩散半径的公式;最后对固结体进行直剪试验,得出注浆后的散粒体强度增加,说明了注浆固坡工程的可行性和合理性。这对散粒体斜坡坡体实施注浆加固工程具有重大的参考价值。

At present,there are limited studies on prevention and control measures of slope with granular mixtures.This paper recommends grouting sand to firm sand-sliding slope. Such sand slope has the characteristics of'dynamic braking'.This paper uses outdoor grouting physical simulation experiment. The grouted sand blocks have the shapes similar to tongue,ganoderma lucidum,cylindrical,long inverted cone and short inverted cone. The effective radiuses respectively are 46. 3cm,26 cm,21. 4cm,16. 5cm,40 cm and 29. 4cm. The screening tests are done on the stacking structure of granular mixtures influences on the grouting sand consolidation measures. The most main influence is the void ratio. The diffusion radius formula and grouting quantity formula are obtained with computer. The shear tests of consolidate bodies show that the shear strength is enhanced,which indicates the feasibility and rationality of grouting sand consolidation engineering. It is of great reference value for the grouting sand consolidation engineering.