Experimental study on soil strength based on piezoelectric ceramic monitoring technology in low-temperature environment
The strength of frozen soil plays an important role in evaluating the stability and safety of structures in frozen soil areas.However,due to the complex four-phase medium system of frozen soil,there are no mature means to monitor the mechanical properties of soil in real time.Based on the piezoelectric ceramic test technolo-gy and the low-temperature triaxial test,the mechanical properties of the soil under different negative tempera-ture conditions are quantitatively studied by taking the silty sand in a project site in northeast China as the object.The results show that with the decrease of temperature,the failure strength,elastic modulus and cohesion of soil show a trend of rapid growth first and then slow growth.At the same time,the time domain image of the piezo-electric signal received by the sensor is extended and expanded,and the main signal frequency range gradually moves to the high frequency direction.The energy of the piezoelectric signal is very sensitive to the change of soil strength.Based on the decomposition signal energy obtained by wavelet packet analysis,the strength strengthening index of silty sand is established,which can well reflect the relationship between negative tempera-ture and soil strength.The research results can provide reference for the engineering application of piezoelectric ceramic testing technology.
万方数据
维普
