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| Experimental study on effects of the roughness on mechanical behaviors#br#
of concrete-sand interface |
| JIN Zihao1，YANG Qi1，2，CHEN Chen1，LENG Wuming1，2，GUO Fengqi1，2，ZHAO Chunyan1，2 |
| (1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；2. National Engineering Laboratory for High Speed Railway Construction，Central South University，Changsha，Hunan 410075，China) |
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Abstract Large-scale direct shear tests were conducted to study the effects of roughness on the mechanical behaviors of concrete-sand interface. The distribution frequency of the bulge size of concrete surface was obtained using the method of statistical analysis based on the curves of the diameter of holes versus depth of bored piles. The concrete slabs with the smooth surface and regular grooves were manufactured to simulate the surface roughness of concrete structures in engineering practice. A new method was proposed to calculate the surface roughness(R) of concrete considering the groove geometry，the disturbed soil volume and the efficient width of groove. The shear band thickness was found to be about 5 times of the average diameter(D50) for the coarse sand and fine gravel with a D50 value greater than 0.7 mm. The peak stress ratio increased approximately linearly with R in a semi-logarithmic scale for concrete-sand interfaces with regular grooves，and the peak and residual stress ratio decreased with the increasing of normal stress. The interface dilation angle increased with the increasing of R but decreased with the increasing of normal stress，implying that the high normal stress restrained the interface dilation behavior and reduced the effects of R on interface dilation. The normalized interface friction coefficient (Ep) increased linearly with R in a semi-logarithmic scale and became greater than 1.0 when R was greater than 0.70 mm. It is thus concluded that the shear strength of sand may not be the up limit of shear strength of concrete-sand interfaces with regular grooves because of“passive resistance”.
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2018, Vol. 37 
