根据对回填砂石试验数据分析,发现砂石颗粒级配不合理会造成回填段不密实,从而产生卸载。通过对回填试验的砂石级配与土力学中的土颗粒级配进行理论分析,分别采用不同级配的砂石进行回填实验,比较各回填段的压缩量,研究砂石级配对回填密实度的影响,并根据土力学中的颗粒级配理论确定了回填段较密实的砂石级配。 According to the test data analysis of backfill sand and found that gravel grading unreasonable will result in the backfill section is not dense, resulting in unloading. Through the theoretical analysis of the gradation of gravel and the grading of soil particles in the backfilling experiment, the sand gravel with different grading was used to carry out the backfilling experiments respectively. The compression of each backfill section was compared to study the effect of gravel grading on the density of backfilling Influence, and according to the theory of particle grading in soil mechanics, the gravel gradation of backfilling section was confirmed.