扰动对软土强度影响规律研究

在Z.Hong和K.Onitsuka扰动度定义的基础上,推导得到扰动后土体屈服应力与扰动度之间的关系,并分析不同灵敏度土体扰动对屈服应力衰减的规律。研究结果表明,扰动对高灵敏度土体屈服应力衰减影响非常大。在屈服应力与扰动度关系的基础上,分析土体十字板抗剪强度、静力触探锥尖阻力和压缩模量等参数与扰动度之间的关系;进行室内振动试验模拟土样扰动,而后进行不同振动时长的固结试验和无侧限抗压试验,室内振动试验结果验证了分析的可靠性和合理性。

EFFECT OF SAMPLE DISTURBANCE ON SOFT SOIL STRENGTH

Soil disturbance degree(SD) defined by Z.Hong and K.Onitsuka is used to analyze the relationship between SD and parameters of soil strength;and the function with the soil strength,disturbance degree and soil sensitivity are established.It is found that the soil yield stress of high sensitivity soil changes greatly when disturbance obeys to the function.Then,the relationships between the soil shear strength,tip resistance of CPT,confined modulus and soil disturbance are discussed.At lastt,he laboratory vibrating model tests are carried out to simulate soil disturbance;and samples with different vibrating times are performed with different disturbance degrees.After vibrating,odometer tests and unconfined compression tests are performed;and reliability and reasonability of the function and relationship are validated.