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| Study on cyclic shearing characteristics of sulfated soil-concrete interface |
| QI Tian1，ZHAO Chuan2，LIU Feiyu2，HE Jianghui2 |
| (1. Guangzhou Environmental Protection Investment Group Co.，Ltd.，Guangzhou，Guangdong 510330，China；2. School of Mechanics and Engineering Science，Shanghai University，Shanghai 200444，China) |
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Abstract In order to explore the shear characteristics of saline soil-concrete interface under cyclic loading，a series of monotonic direct shear tests，cyclic direct shear tests，and post-cyclic direct shear tests were carried out through large-scale dynamic direct shear apparatus. The effects of 5 salt contents(0%，1%，2%，3%，4%)，3 shear displacement amplitudes(3，6，9 mm) and 3 shear frequencies(0.25，0.5，1 Hz) on cyclic shear characteristics of saline soil-concrete interface were analyzed，and the changing laws of interface shear strength under different salt contents before and after cyclic loading were also compared and analyzed. The results showed that when the salt content was 0%，1%，2% and 3%，the obvious decrement of the peak shear stress was shown in the initial cycles，and slightly increment in the subsequent cycles. When the salt content was 4%，the interface peak shear stress firstly increased to maximum shear stress at cycle number of 16，and then decreased with the increase of cycle number. During the shearing process，the change of the shear dilatation was mainly concentrated in the first ten cycles. As the number of cycles increased，the value of dilatancy reduced. The interface shear stress increased under the cyclic loading with larger shear displacement amplitude and higher shear frequency. Compared with that in monotonic direct shear tests，the interface shear strength after cyclic direct shear tests was improved. The effect of salt content on interface strength was attenuated by cyclic shearing.
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2023, Vol. 42 
