硫酸盐渍土–混凝土界面循环剪切特性研究

doi:10.13722/j.cnki.jrme.2022.1055

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摘要为了研究动荷载作用下盐渍土与混凝土界面的剪切特性，采用室内大型动态直剪仪，对自制硫酸盐渍土与混凝土界面进行一系列单调直剪、循环直剪及循环后单调直剪试验。试验研究5种含盐量(0%，1%，2%，3%，4%)、3种剪切位移幅值(3，6，9 mm)、3种剪切频率(0.25，0.5，1 Hz)等因素对界面循环直剪特性的影响，并对比分析单调直剪和循环后单调直剪试验中不同含盐量下界面抗剪强度的变化规律。研究结果表明：含盐量为0%，1%，2%，3%时，界面峰值剪应力在循环前期出现明显下降趋势，在随后的循环周期内略有增强，含盐量为4%时界面峰值剪应力先增大后减小，循环16圈后达到应力最大值；剪切过程中剪胀量变化主要集中在前10次循环周期内，随着循环次数增大，剪胀量逐渐减小。较大剪切位移幅值和较高剪切频率下的循环加载将使界面剪应力提高。循环后单调直剪试验中界面抗剪强度较单调直剪试验的界面抗剪强度有所提高，并且循环剪切作用减弱了含盐量对界面抗剪强度的影响。

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	齐添1
	赵川2
	刘飞禹2
	何江荟2

关键词 ：土力学, 盐渍土, 动荷载, 含盐量, 循环直剪试验, 土&ndash, 混凝土界面

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.

Key words： soil mechanics saline soil cyclic loading salt content cyclic direct shear tests soil-concrete interface

引用本文:

齐添1，赵川2，刘飞禹2，何江荟2. 硫酸盐渍土–混凝土界面循环剪切特性研究[J]. 岩石力学与工程学报, 2023, 42(S2): 4280-4288.
QI Tian1，ZHAO Chuan2，LIU Feiyu2，HE Jianghui2. Study on cyclic shearing characteristics of sulfated soil-concrete interface. , 2023, 42(S2): 4280-4288.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1055 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4280

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