【摘要】 通过室内试验 ,测定不同密实度粉土的临界水力坡降。由试验结果可以看出 ,粉土的临界水力坡降与一般砂性土有着较大差异 ,一般砂性土临界水力坡降icr=(ρ- ρw)/ρw ,变化范围在0.8～1.5之间 ,而现代黄河水下三角洲粉土的临界水力坡降为9.5～16.5。同时对土体进行受力分析 ,考虑颗粒间的凝聚力 ,对以上结果产生的机理进行分析 ,并找出临界水力坡降与其物理性质指标之间的关系更多还原

【Abstract】 By laboratory test, this paper shows the critical hydraulic gradient of silt with different degree of compaction. From the results it can be found that .silt′s critical hydraulic gradient differs greatly with sandy soil′s. In common the critical hydraulic gradient of sand is icr=(ρ-ρw)/ ρw,,and it can change from 0.8 to 1.5. However the critical hydraulic gradient of silt is 9.5～16.5. Meanwhile this paper analyses the forces acting on soil mass and considers the cohesion within grains, then analyses the cause of the results above, and finds the relation between critical hydraulic gradient and silt’s physical property index.更多还原