|
|
|
Abstract In order to explore the strength and deformation differences of the interface between saline soil and concrete in different areas，using self-made sodium sulphate saline soil and concrete samples，a series of monotonic direct shear tests were carried out under different salt contents，initial dry densities and normal stresses. The effects of different factors on the interfacial shear strength were studied，and the variation laws of the interfacial shear strength parameters and dilatancy under different salt contents were analyzed. The results show that the deterioration of the interfacial shear strength is caused by the salt content. If the pore solution of saline soil is in unsaturated state，the deterioration is weakened with the increase of the salt content. Otherwise，the degradation effect is increased. The enhancement effect of the initial dry density on the interfacial shear strength is inhibited by saline soil. The average failure shear stresses of the interface with salt contents of 1% to 4% under different vertical stresses are respectively 0.71，0.75，0.86 and 0.77 times that of plain soil，and the salt erosion reduction coefficient of the interface varies in the range of 0.68–0.88. As the salt content increases，the interfacial cohesion is enhanced，and the same trend as the shear strength is shown in the internal friction angle. In addition，the interface cohesion is more significantly affected by the salt content. Under the condition of a lower normal stress and a higher salt content，dilatancy is appeared in the interface，and shear shrinkage is shown in other cases. The shear shrinkage increases with the normal stress，and the minimum value is obtained when the salt content is 3%. The interfacial dilatancy angle increases significantly with the increase of the salt content in the range of 0% to 3% of the salt content. Besides，the increase of the interfacial dilatancy angle is restrained by a higher normal stress and the effect of the salt content on the dilatancy angle is weakened under the same condition.
|
|
|
|
|
|
| [1] MICHAEL J M，LASZLO J C，ANISHA S，et al. Fly ash influences on sulfate heave in lime-stabilised soils[J]. Proceedings of the Institution of Civil Engineers，2012，165(3)：147–158.
[2] ZHOU Y X，GUAN Q F，YAN P Y，et al. Investigation of freeze-thaw resistance of stabilized saline soil[J]. Advances in Civil Engineering，2021，21(5)：1–13.
[3] 金子豪，杨 奇，陈 琛，等. 粗糙度对混凝土–砂土接触面力学特性的影响试验研究[J]. 岩石力学与工程学报，2018，37(3)：754–765.(JIN Zihao，YANG Qi，CHEN Chen，et al. Experimental study on effects of the roughness on mechanical behaviors of concrete-sand interface[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(3)：754–765.(in Chinese))
[4] DONNA A D，FERRARI A，LALOUI L. Experimental investigations of the soil-concrete interface：physical mechanisms，cyclic mobilization，and behaviour at different temperatures[J]. Canadian Geotechnical Journal，2016，53(4)：659–672.
[5] CHEN X B，ZHANG J S，XIAO Y J，et al. Effect of roughness on shear behavior of red clay-concrete interface in large-scale direct shear tests[J]. Canadian Geotechnical Journal，2015，52(8)：1 122–1 135.
[6] 龚 辉，赵春风，陶帼雄，等. 应力历史对黏土–混凝土界面剪切特性的影响研究[J]. 岩石力学与工程学报，2011，30(8)：1 712–1 719. (GONG Hui，ZHAO Chunfeng，TAO Guoxiong，et al. Research on effect of stress history on shear behavior of interface between clay and concrete[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(8)：1 712–1 719.(in Chinese))
[7] XING L，WANG D Y，WANG L，et al. Experimental study on pile-soil interaction response in saturated sand under long-term horizontal cyclic loading[J]. Advances in Civil Engineering，2021，(2)：1–10.
[8] 王永洪，张明义，刘俊伟，等. 超孔隙水压力对低塑性黏性土桩土界面抗剪强度的影响[J]. 岩土力学，2018，39(3)：831–838.(WANG Yonghong，ZHANG Mingyi，LIU Junwei，et al. Influence of excess pore water pressure on shear strength of pile-soil interface in clayey soil[J]. Rock and Soil Mechanics，2018，39(3)：831–838.(in Chinese))
[9] SAGGU R. Temperature effects on pile-soil interface behaviour in case of piles in sand[J]. Geotechnical Engineering，2021，(3)：1–38.
[10] YAZDANI S，HELWANY S，OLGUN G. Influence of temperature on soil-pile interface shear strength[J]. Geomechanics for Energy and the Environment，2018，18(6)：69–73.
[11] 孔令伟，熊春发，郭爱国，等. 海积软黏土的强度特性与桩土界面剪切速率效应[J]. 岩土工程学报，2017，39(增2)：13–16.(KONG Lingwei，XIONG Chunfa，GUO Aiguo，et al. Effects of shear rate on strength properties and pile-soil interface of marine soft clay[J]. Chinese Journal of Geotechnical Engineering，2017，39(Supp.2)：13–16.(in Chinese))
[12] WANG Y H，SANG S K，ZHANG M Y，et al. Field test of earth pressure at pile-soil interface by single pile penetration in silty soil and silty clay[J]. Soil Dynamics and Earthquake Engineering，2021，145(5)：1–10.
[13] YE W，ZHANG F，CHEN B. Effect of salt solutions on the hydro-mechanical behavior of compacted GMZ01 bentonite[J]. Environmental Earth Science，2014，72(7)：2 621–2 630.
[14] 邴 慧，何 平. 不同冻结方式下盐渍土水盐重分布规律的试验研究[J]. 岩土力学，2011，32(8)：2 307–2 312.(BING Hui，HE Ping. Experimental study of water and salt redistributions of saline soil with different freezing modes[J]. Rock and Soil Mechanics，2011，32(8)：2 307–2 312.(in Chinese))
[15] XU Y F，XIANG G S，JIANG H，et al. Role of osmotic suction in volume change of clays in salt solution[J]. Applied Clay Science，2014，101：354–361.
[16] CARTERET R D，BUZZI O，FITYUS S，et al. Effect of naturally occurring salts on tensile and shear strength of sealed granular road pavements[J]. Journal of Materials in Civil Engineering，2013，26(6)：401–410.
[17] 张 彧，邹美思，徐安花，等. 温度对盐渍土抗剪强度和变形特性的影响[J]. 中国公路学报，2020，33(5)：66–78.(ZHANG Yu，ZOU Meisi，XU Anhua，et al. Effect of temperature on shear strength and deformation characteristics of saline soil[J]. China Journal of Highway and Transport，2020，33(5)：66–78.(in Chinese))
[18] 杨爱武，杨少朋，郎瑞卿，等. 轻质固化盐渍土三维力学特性研究[J]. 岩土力学，2021，42(3)：593–600.(YANG Aiwu，YANG Shaopeng，LANG Ruiqing，et al. Three-dimensional mechanical properties of light solidified saline soil[J]. Rock and Soil Mechanics，2021，42(3)：593–600.(in Chinese))
[19] 牛丽思，张爱军，赵佳敏，等. 易溶盐含量对伊犁原状黄土力学特性的影响规律[J]. 岩土工程学报，2020，42(9)：1 705–1 714.(NIU Lisi，ZHANG Aijun，ZHAO Jiamin，et al. Influences of soluble salt content on mechanical properties of Ili undisturbed loess[J]. Chinese Journal of Geotechnical Engineering，2020，42(9)：1 705–1 714.(in Chinese))
[20] 张 芹，颜荣涛，韦昌富. 孔隙溶液对粉质黏土界限含水率的影响[J]. 岩土力学，2015，36(增1)：558–562.(ZHANG Qin，YAN Rongtao，WEI Cangfu. Effects of pore fluids on consistency limits of silty clay[J]. Rock and Soil Mechanics，2015，36(Supp.1)：558–562.(in Chinese))
[21] 何鹏飞，马 巍，穆彦虎，等. 冻融循环对冻土–混凝土界面冻结强度影响的试验研究[J]. 岩土工程学报，2020，42(2)：299–307. (HE Pengfei，MA Wei，MU Yanhu，et al. Experiment study on effects of freeze-thaw cycles on adfreezing strength at frozen soil-concrete interface[J]. Chinese Journal of Geotechnical Engineering，2020，42(2)：299–307.(in Chinese))
[22] WANG Y G，ZHANG A J，REN W Y，et al. Study on the soil water characteristic curve and its fitting model of Ili loess with high level of soluble salts[J]. Journal of Hydrology，2019，578(C)：1–16.
[23] CALVELLO M，LASCO M，VASSALLO R，et al. Compressibility and residual shear strength of smectiticclays：influence of pore aqueous solutions and organic solvents[J]. International Geotechnical Journal，2005，(1)：34–46.
[24] WEI J，SHI B L LI J L，et al. Shear strength of purple soil bunds under different soil water contents and dry densities[J]. Catena，2018，166：124–133.
[25] 刘倩倩，李 舰，蔡国庆，等. 全吸力范围内盐渍土持水特性的试验研究[J]. 岩土力学，2021，42(3)：713–722.(LIU Qianqian，LI Jian，CAI Guoqing，et al. Experimental study on water retention characteristics of saline soil in the full suction range[J]. Rock and Soil Mechanics，2021，42(3)：713–722.(in Chinese))
[26] 刘飞禹，武文静，符洪涛，等. 基于3D打印的立体格栅网筋土界面剪切特性研究[J]. 中国公路学报，2022，35(4)：1–9.(LIU Feiyu，WU Wenjing，FU Hongtao，et al. Research on shear behavior of 3D printed three-dimensional geogrid-sand interface[J]. China Journal of Highway and Transport，2022，35(4)：1–9.(in Chinese))
[27] 徐泽友，卢延浩，丁明武. 高塑性黏土与混凝土接触面剪切特性[J]. 河海大学学报：自然科学版，2009，37(1)：71–74.(XU Zeyou，LU Yanhao，DING Mingwu. Shear properties at interface between highly plastic clay and concrete[J]. Journal of Hohai University：Nutural Science，2009，37(1)：71–74.(in Chinese)) |
|
|
