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粉土因黏粒含量不高存在强度偏低等工程问题。通过制备不同初始状态(干密度、含水量)的粉土,进行了剪切试验。探讨了初始状态对其强度指标的影响规律,并且也研究了水泥改良粉土的干密度对其强度的影响。结果表明,粉土的黏聚力受密实度和含水量的影响最大,随含水量的变化黏聚力呈现驼峰状,总体说来压实度低相应的黏聚力也就较小。同等条件下掺4%的水泥以后粉土的强度得到了较大的提高,内摩擦角提高了2倍和黏聚力提高4倍左右。
Silt due to low clay content is low and other engineering problems. Shear tests were carried out by preparing silt of different initial conditions (dry density, water content). The influence of initial state on its strength index was discussed, and the effect of dry density of cement-modified silt on its strength was also studied. The results show that the cohesion of silt is the most affected by the compaction and water content. With the change of water content, the cohesion presents a hump shape. Generally, the cohesion of silt is low. Under the same conditions, the strength of silt is greatly improved with 4% cement, the internal friction angle is increased by 2 times and cohesion is increased by 4 times.