砂土-结构接触面剪切特性大型直剪试验研究
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摘要
为充分开发铁尾矿和建筑废料在砂土地区铁路路基工程中的价值,研究土与结构物接触面的力学特性,对现有的大型直剪仪进行改造,设计试验方案完成24组单向直剪试验,对砂土与不同混凝土类型接触面的应力-应变曲线及其破坏形式进行分析。研究结果表明:随着法向应力的增加,接触面破坏形式由接触面发生滑动破坏到接触面附近的砂土自身发生硬化型破坏过渡;w/τ-w近似为一次函数关系;当含水率一定时,铁尾矿再生混凝土接触面的剪切模量高于普通混凝土接触面的剪切模量,同时铁尾矿再生混凝土接触面的黏聚力大于普通混凝土,由此表明,铁尾矿再生混凝土接触面抵抗剪切的能力高于普通混凝土接触面,论证了铁尾矿再生混凝土接触面的粗糙度大于普通混凝土接触面这一观点,因此,将铁尾矿再生混凝土替代普通混凝土应用到实际工程中是可行的。
In order to fully develop the value of iron tailings and construction waste in railway subgrade engineering in fine sand area, the mechanical properties of the interface between soil and structure were studied,modification of the existing large direct shear apparatus, the design test scheme completed 24 unidirectional direct shear tests, and the stress-strain curves and failure forms of the contact surfaces of fine sand and different concrete types were analyzed. The results show that with the increase of normal stress, the failure form of contact surface changes from sliding failure of contact surface to hardening failure transition of sand soil near contact surface;w/τ-w is approximately a function of one time; When the water content is constant, the shear modulus of reclaimed concrete contact surface of iron tailings is higher than that of ordinary concrete contact surface, at the same time, the cohesive force of the contact surface of regenerated concrete in iron tailings is greater than that of ordinary concrete, suggesting that iron tailings recycled concrete interface shear stress resistance higher than that of ordinary concrete interface, it is proved that the roughness of the surface of regenerated concrete in iron tailings is greater than that of ordinary concrete, Therefore, it is feasible to apply regenerated concrete from iron tailings instead of ordinary concrete in practical engineering.
In order to fully develop the value of iron tailings and construction waste in railway subgrade engineering in fine sand area, the mechanical properties of the interface between soil and structure were studied,modification of the existing large direct shear apparatus, the design test scheme completed 24 unidirectional direct shear tests, and the stress-strain curves and failure forms of the contact surfaces of fine sand and different concrete types were analyzed. The results show that with the increase of normal stress, the failure form of contact surface changes from sliding failure of contact surface to hardening failure transition of sand soil near contact surface;w/τ-w is approximately a function of one time; When the water content is constant, the shear modulus of reclaimed concrete contact surface of iron tailings is higher than that of ordinary concrete contact surface, at the same time, the cohesive force of the contact surface of regenerated concrete in iron tailings is greater than that of ordinary concrete, suggesting that iron tailings recycled concrete interface shear stress resistance higher than that of ordinary concrete interface, it is proved that the roughness of the surface of regenerated concrete in iron tailings is greater than that of ordinary concrete, Therefore, it is feasible to apply regenerated concrete from iron tailings instead of ordinary concrete in practical engineering.
引文
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[2]成浩,陈晓斌,张家生,等.红黏土-混凝土结构接触面残余强度特性试验研究[J].中南大学学报(自然科学版),2017,48(9):2458-2464.CHENG Hao,CHEN Xiaobin,ZHANG Jiasheng,et al.Experimental research on residual shear strength of red clay-concrete structure interface[J].Journal of Central South University(Science and Technology),2017,48(9):2458-2464.
[3]成浩,王晅,张家生,等.颗粒粒度与级配对碎石料与结构接触面剪切特性的影响[J].中南大学学报(自然科学版),2018,49(4):925-932.CHENG Hao,WANG Xuan,ZHANG Jiasheng,et al.Effects of particle size and gradation on shear behavior of interface between crushed stone and structure[J].Journal of Central South University(Science and Technology),2018,49(4):925-932.
[4]Sawicki A,Chybicki W.On accuracy of prediction of pre-failure deformations of granular soils[J].Computers&Geotechnics,2009,36(6):993-999.
[5]Evgin E,Fakharian K.Effect of stress paths on the behaviour of sand-steel interfaces[J].Canadian Geotechnical Journal,1996,33(33):853-865.
[6]Kruyt N P.Micromechanical study of plasticity of granular materials[J].Comptes Rendus Mécanique,2010,338(10):596-603.
[7]陈俊桦,张家生,李键.接触面粗糙度对红黏土-混凝土接触面力学性质的影响[J].中南大学学报(自然科学版),2016,47(5):1682-1688.CHEN Junhua,ZHANG Jiasheng,LI Jian.Influence of interface roughness on mechanical properties of red clay-concrete interface[J].Journal of Central South University(Science and Technology),2016,47(5):1682-1688.
[8]陆凯安.我国建筑垃圾的现状与综合利用[J].施工技术,1999,28(5):15-16.LU Kaian.Status quo and comprehensive utilization of refuse produced from construction and removal of buildings in China[J].Construction Technology,1999,28(5):15-16.
[9]文华,李晓静.建筑垃圾在道路工程领域的研究现状及发展趋势[J].施工技术,2015,44(16):81-84.WEN Hua,LI Xiaojing.Build slag in road engineering research present situation and development trend[J].Construction Technology,2015,44(16):81-84.
[10]王罗春,赵由才.建筑垃圾处理与资源化[M].北京:化学工业出版社,2004.WANG Luochun,ZHAO Youcai.Disposal and resource of construction waste[M].Beijing:Chemical Industry Press,2004.
[11]Somna R,Chai J,Rattanachu P,et al.Effect of ground bagasse ash on mechanical and durability properties of recycled aggregate concrete[J].Materials&Design,2012,36:597-603.
[12]丁天庭,李启华,陈树东.再生混凝土的强度及耐久性能研究[J].硅酸盐通报,2017,36(3):846-850.DING Tianting,LI Qihua,CHEN Shudong.Basic mechanics and durability of recycled concrete[J].Bulletin of the Chinese Ceramic Society 2017,36(3):846-850.
[13]夏阳.浅析建筑垃圾再生混凝土应用的耐久性[J].混凝土,2017(7):151-153.XIA Yang.Durability of recycled concrete with waste is analyzed[J].Concrete,2017(7):151-153.
[14]中华人民共和国水电部.土工试验方法标准[M].北京:中华计划出版社,1989.Ministry of Water and Electricity of the People’s Republic of China.Beijing:Standard for geotechnical test methods[M].Beijing:China Plan Press,1989.
[15]闫澍旺,林澍,贾沼霖,等.海洋土与钢桩界面剪切强度的大型直剪试验研究[J].岩土工程学报,2018(3):495-501.YAN Shuwang,LIN Shu,JIA Zhaolin,et al.Large-scale direct shear tests on shear strength of interface between marine soil and steel pile[J].Chinese Journal of Geotechnical Engineering,2018(3):495-501.