A study on the injection of particle into ground and its application by using the void diameter distribution

土的孔隙直径分布是表征孔隙结构和选择灌浆材料的重要因素，对于空气侵入法测量土的孔隙直径分布，（一）通过对砂样和人工毛细管模型的测量，验证了该方法的适用性，并将空气侵入法和（2）空气侵入法的分布比水分特征法的分布更均匀，（3）该方法的平均空隙直径相当于水分特征法的80%~ 90%，通过颗粒注入砂中的注入试验，研究了空气侵入法测得的砂体空隙直径与注入颗粒尺寸之间的关系柱结果表明：（4）喷射颗粒的粒径小于平均孔隙直径的60%，（5）在砂柱中均匀停留的颗粒的粒径相当于平均孔隙直径的30%。通过环剪试验，研究了顶进管外壁剪切带的空隙直径分布。

The distribution of soil void diameter is an important factor to express void structure and to select grout materials for the improvement of weak soils.For the air intrusion method proposed to measure the distribution of soil void diameter,(1) the adaptability of the method is verified on the measurement for both sand samples and artificial capillary tube model.For the comparison between the void diameter distribution by air intrusion method with the one estimated from moisture characteristic curve as three-dimensional evaluation,(2) the distributions by air intrusion method become more uniform than by moisture characteristic,(3) the mean void diameters by the method correspond to 80% to 90% of that by the moisture characteristic.Second, the relationship between sand void diameter measured by air intrusion method and sizes of injected particles are examined by injection test which particles are injected into sand column. As a result,(4) the sizes of injected particles is less than that of mean void diameter by 60%,(5) the sizes of the particles which stay uniformly through sand column is equivalent to 30% of the mean void diameter.Third, for the jacking method, the frictional resistance and the fabric, void diameter distribution of shear band occurring at the outskirts of jacking pipe are examined based on the ring shear test.