Experimental study on shearing mechanical characteristics of thawing soil and structure interface under high pressure
To explore shearing mechanical characteristics of the interface between thawing soil and structure interface,a series of direct shear tests was performed by using an improved DRS-1 high-pressure direct shearing system.The results showed that the normal stress and the thawing temperature presented remarkable effects on the shear strength of thawing soil-structure interface under high pressure.Both the peak and the residual shear strengths of the interface increased with the increase of the normal stress.The increasing rate of the peak shear strength was less correlated to the thawing temperature (between 0.36 and 0.46,mean value 0.43),while the rate of the residual shear strength increased obviously (Under testing conditions,mean value is 0.26 at Tthaw =-10 and -5 C,mean value is 0.49 at Tthaw =-2 and +0～3 ℃).At the higher stress level,the increasing rate of the peak shear strength with normal stress was about 2/5 of that at the lower stress level.The demarcation stress range was about 1～3 MPa for high and low stresses.With increasing the thawing temperature,shearing stress-displacement curve gradually transformed from strain-hardening to strain-softening,which showed significant peak shear stress.Furthermore,the normalised peak shear strength decreased slowly when it was subjected to a relatively low temperature.However,with further increasing the thawing temperature,the differences of normalised peak shear strength under various normal stresses was decreased,until converged to a narrow range value.
direct shear testthawing soilinterfacehigh pressureshear strength
国家科技期刊平台
NSTL
万方数据
维普
