粉质黏土超声波速度异常变化试验研究

Research on the Exceptional Performance of Ultrasonic Velocity in Silty Clay

借鉴了岩石中的超声波波速公式,针对粉质黏土的实际情况,选择了合适的时间-波速平均方程,同时结合波速本构方程,解释了粉质黏土中波速的异常行为,并选取南京某工程中的粉质黏土作为试验土样,依据胡瑞林提出黏土的微结构变化理论,研究干燥原状土样和湿润原状土样在分级侧限压缩试验之下超声波波速与含水量、密度、孔隙度、流体饱和度的关系,为解释粉质黏土中波速的异常行为提供了理论基础和实例参考。

According to the microstructure change theory proposed by Ruilin Hu and the velocity constitutive equation,a method applied in rock was introduced to clarify the exceptional behaviors of ultrasonic velocity in the silty clay,where the velocity decreased with the increase of pressure. The formula was examined using the examples from the project in Nanjing to determine parts of water ratio,void ratio,density and fluid saturation in the process. All of these provided an example instance and laid a theoretical foundation for the explanation of exceptional wave behavior in the silty clay.