水泥改良泥质板岩粗粒土的静力特性
|
摘要
针对泥质板岩粗粒土,通过大型静三轴压缩试验研究未改良土样和水泥改良土样的轴向应力-轴向应变关系、体积应变-轴向应变关系、抗压强度、内摩擦角、黏聚力和弹性模量等,根据试验结果对水泥改良土和未改良土的力学性质进行比较。研究结果表明:水泥改良土和未改良土均具有应变软化性和剪胀性,改良土的应变软化性和剪胀性均比未改良土的显著;水泥改良土的最大体积压缩应变、与最大体积压缩应变对应的轴向应变均比未改良土的小,而残余体积膨胀变形比未改良土的大;水泥改良土破坏时变形比未改良土的小;与未改良土相比,水泥改良土的抗压强度、黏聚力和弹性模量均显著提高,线弹性变形范围也显著扩大,但内摩擦角的变化不大;水泥改良效果良好,水泥改良提高了泥质板岩粗粒土的力学性能。
Large scale static triaxial compressive tests were carried out to study the mechanical properties of argillaceous slate coarse-grained soil and the argillaceous slate coarse-grained improved by cement. Axial stress-strain relation,volumetric strain-axial strain relation, compressive strength, internal fraction angel, cohesion and elastic modulus of soil samples were obtained by the tests. Comparisons of test results between the improved soil and the unimproved soil were conducted. The results show that the soil improved by cement as well as the unimproved soil has mechanical properties of strain softening indicated by the axial stress-strain relation and dilatancy indicated by the volumetric strain-axial strain relation. Both the strain softening and dilatancy of the improved soil are more remarkable than those of the unimproved soil. The maximum compressive volumetric strain of the soil improved by cement and the axial strain corresponding to the maximum one are smaller than those of the unimproved soil, while the residual volumetric dilatancy of the soil improved by cement is larger than that of the unimproved soil. The failure strain of the improved soil is smaller than that of the unimproved soil. Compared to the unimproved soil, the compressive strength, the cohesion, the elastic modulus and the range of linear elastic deformation of the improved soil are enhanced significantly, while there is not much change to the internal fraction angle. As the mechanical properties of the argillaceous slate coarse-grained soil are improved by cement, the effects of the soil improvement are good.
Large scale static triaxial compressive tests were carried out to study the mechanical properties of argillaceous slate coarse-grained soil and the argillaceous slate coarse-grained improved by cement. Axial stress-strain relation,volumetric strain-axial strain relation, compressive strength, internal fraction angel, cohesion and elastic modulus of soil samples were obtained by the tests. Comparisons of test results between the improved soil and the unimproved soil were conducted. The results show that the soil improved by cement as well as the unimproved soil has mechanical properties of strain softening indicated by the axial stress-strain relation and dilatancy indicated by the volumetric strain-axial strain relation. Both the strain softening and dilatancy of the improved soil are more remarkable than those of the unimproved soil. The maximum compressive volumetric strain of the soil improved by cement and the axial strain corresponding to the maximum one are smaller than those of the unimproved soil, while the residual volumetric dilatancy of the soil improved by cement is larger than that of the unimproved soil. The failure strain of the improved soil is smaller than that of the unimproved soil. Compared to the unimproved soil, the compressive strength, the cohesion, the elastic modulus and the range of linear elastic deformation of the improved soil are enhanced significantly, while there is not much change to the internal fraction angle. As the mechanical properties of the argillaceous slate coarse-grained soil are improved by cement, the effects of the soil improvement are good.
引文
[1]陈乐求,陈俊桦,张家生.干湿循环作用下水泥改良泥质板岩粗粒土动力特性[J].湖南大学学报(自然科学版),2017,44(9):107-113.CHEN Leqiu,CHEN Junhua,ZHANG Jiasheng.Dynamic properties of cement-improved argillite-slate coarse-grained soil under drying-wetting cycles[J].Journal of Hunan University(Science and Technology),2017,44(9):107-113.
[2]陈乐求,张家生,陈俊桦,等.水泥改良泥质板岩粗粒土的静动力特性试验[J].岩土力学,2017,38(7):1903-1910.CHEN Leqiu,ZHANG Jiasheng,CHEN Junhua,et al.Testing of static and dynamic strength properties of cement-improved argillaceous-slate coarse-grained soil[J].Rock and Soil Mechanics,2017,38(7):1903-1910.
[3]俞永华,杨晓华.水泥黄土力学特性试验[J].长安大学学报(自然科学版),2003,23(6):29-32.YU Yonghua,YANG Xiaohua.Experiments of mechanic property of cement-loess[J].Journal of Chang’an University(Natural Science Edition),2003,23(6):29-32.
[4]贾厚华.化学改良土无侧限抗压强度的试验研究[J].土工基础,2010,24(3):84-87.JIA Houhua.Experimental research on unconfined compressive strength for chemical-improved soil[J].Soil Engineering and Foundation,2010,24(3):84-87.
[5]高晓波,阮波,田晓涛,等.贵州地区石灰改良膨胀土无侧限抗压强度的试验研究[J].铁道科学与工程学报,2014,11(6):68-71.GAO Xiaobo,RUAN Bo,TIAN Xiaotao,et al.Experiment study on unconfined compressive strength of lime stabilized expansive soil in Guizhou province[J].Journal of Railway Science and Engineering,2014,11(6):68-71.
[6]李志清,余文龙,范林峰,等.改良黄土强度特性与工程处置试验研究[J].工程地质学报,2011,19(1):116-121.LI Zhiqing,YU Wenlong,FAN Linfeng,et al.Experimental research on strength characteristics and engineering treatment of improved loess soil[J].Journal of Engineering Geology,2011,19(1):116-121.
[7]边加敏,蒋玲,王保田.石灰改良膨胀土强度试验[J].长安大学学报(自然科学版),2013,33(2):38-43.BIAN Jiamin,JIANG Ling,WANG Baotian.Experiment on the strength of lime-treated expansive soil[J].Journal of Chang’an University(Natural Science Edition),2013,33(2):38-43.
[8]杨俊,杨志,张国栋,等.龄期及水泥掺量对水泥稳定风化砂岩抗剪指标的影响[J].合肥工业大学学报(自然科学版),2015,38(4):517-519.YANG Jun,YANG Zhi,ZHANG Guodong,et al.Study of shear index of cement stabilized weathered sand under condition of different curing age and cement content[J].Journal of Hefei University of Technology(Natural Science Edition),2015,38(4):517-519.
[9]贺建清,曾娟,孙希望.低掺量水泥土抗剪强度试验研究[J].矿冶工程,2009,29(6):9-12.HE Jianqing,ZENG Juan,SUN Xiwang.Experimental study on shear strength of soft soil treated with low-content cement[J].Ming and Metallurgical Engineering,2009,29(6):9-12.
[10]李作恒.石灰改良盐渍土路基工程特性试验研究[J].石家庄铁道大学学报(自然科学版),2007,20(2):45-48.LI Zuoheng.Test study on engineering characteristics of lime-improved saline soil for highway subgrade[J].Journal of Shijiazhuang Railway Institute(Natural Science),2007,20(2):45-48.
[11]周葆春,孔令伟,郭爱国.石灰改良膨胀土的应力-应变-强度特征与本构描述[J].岩土力学,2012,33(4):999-1005.ZHOU Baochun,KONG Lingwei,GUO Aiguo.Stress-strain-strength behaviour and constitutive description of lime-treated expansive soil[J].Rock and Soil Mechanics,2012,33(4):999-1005.
[12]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.
[13]陈俊桦,张家生,李键.考虑粗糙度的黏性土结构接触面力学特性试验[J].四川大学学报(工程科学版),2015,47(4):22-30.CHEN Junhua,ZHANG Jiasheng,LI Jian.Experimental research on mechanics characteristics of cohesive soil-structure interface by considering its roughness[J].Journal of Sichuan University(Engineering Science Edition),2015,47(4):22-30.
[14]陈乐求,张家生,陈俊桦.泥质板岩改良土物理力学性质试验[J].湖南理工学院学报(自然科学版),2017,30(1):63-68.CHEN Leqiu,ZHANG Jiasheng,CHEN Junhua.Test of physical and mechanical properties of improved argillite-slate soil[J].Journal of Hunan Institute of Science and Technology(Science and Technology),2017,30(1):63-68.
[15]陈乐求,陈俊桦,张家生,等.水泥改良泥质板岩土动力特性试验[J].中南大学学报(自然科学版),2017,48(7):1858-1865.CHEN Leqiu,CHEN Junhua,ZHANG Jiasheng,et al.Test of dynamic properties of argillite-slate soil improved by cement[J].Journal of Central South University(Science and Technology),2017,48(7):1858-1865.
[2]陈乐求,张家生,陈俊桦,等.水泥改良泥质板岩粗粒土的静动力特性试验[J].岩土力学,2017,38(7):1903-1910.CHEN Leqiu,ZHANG Jiasheng,CHEN Junhua,et al.Testing of static and dynamic strength properties of cement-improved argillaceous-slate coarse-grained soil[J].Rock and Soil Mechanics,2017,38(7):1903-1910.
[3]俞永华,杨晓华.水泥黄土力学特性试验[J].长安大学学报(自然科学版),2003,23(6):29-32.YU Yonghua,YANG Xiaohua.Experiments of mechanic property of cement-loess[J].Journal of Chang’an University(Natural Science Edition),2003,23(6):29-32.
[4]贾厚华.化学改良土无侧限抗压强度的试验研究[J].土工基础,2010,24(3):84-87.JIA Houhua.Experimental research on unconfined compressive strength for chemical-improved soil[J].Soil Engineering and Foundation,2010,24(3):84-87.
[5]高晓波,阮波,田晓涛,等.贵州地区石灰改良膨胀土无侧限抗压强度的试验研究[J].铁道科学与工程学报,2014,11(6):68-71.GAO Xiaobo,RUAN Bo,TIAN Xiaotao,et al.Experiment study on unconfined compressive strength of lime stabilized expansive soil in Guizhou province[J].Journal of Railway Science and Engineering,2014,11(6):68-71.
[6]李志清,余文龙,范林峰,等.改良黄土强度特性与工程处置试验研究[J].工程地质学报,2011,19(1):116-121.LI Zhiqing,YU Wenlong,FAN Linfeng,et al.Experimental research on strength characteristics and engineering treatment of improved loess soil[J].Journal of Engineering Geology,2011,19(1):116-121.
[7]边加敏,蒋玲,王保田.石灰改良膨胀土强度试验[J].长安大学学报(自然科学版),2013,33(2):38-43.BIAN Jiamin,JIANG Ling,WANG Baotian.Experiment on the strength of lime-treated expansive soil[J].Journal of Chang’an University(Natural Science Edition),2013,33(2):38-43.
[8]杨俊,杨志,张国栋,等.龄期及水泥掺量对水泥稳定风化砂岩抗剪指标的影响[J].合肥工业大学学报(自然科学版),2015,38(4):517-519.YANG Jun,YANG Zhi,ZHANG Guodong,et al.Study of shear index of cement stabilized weathered sand under condition of different curing age and cement content[J].Journal of Hefei University of Technology(Natural Science Edition),2015,38(4):517-519.
[9]贺建清,曾娟,孙希望.低掺量水泥土抗剪强度试验研究[J].矿冶工程,2009,29(6):9-12.HE Jianqing,ZENG Juan,SUN Xiwang.Experimental study on shear strength of soft soil treated with low-content cement[J].Ming and Metallurgical Engineering,2009,29(6):9-12.
[10]李作恒.石灰改良盐渍土路基工程特性试验研究[J].石家庄铁道大学学报(自然科学版),2007,20(2):45-48.LI Zuoheng.Test study on engineering characteristics of lime-improved saline soil for highway subgrade[J].Journal of Shijiazhuang Railway Institute(Natural Science),2007,20(2):45-48.
[11]周葆春,孔令伟,郭爱国.石灰改良膨胀土的应力-应变-强度特征与本构描述[J].岩土力学,2012,33(4):999-1005.ZHOU Baochun,KONG Lingwei,GUO Aiguo.Stress-strain-strength behaviour and constitutive description of lime-treated expansive soil[J].Rock and Soil Mechanics,2012,33(4):999-1005.
[12]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.
[13]陈俊桦,张家生,李键.考虑粗糙度的黏性土结构接触面力学特性试验[J].四川大学学报(工程科学版),2015,47(4):22-30.CHEN Junhua,ZHANG Jiasheng,LI Jian.Experimental research on mechanics characteristics of cohesive soil-structure interface by considering its roughness[J].Journal of Sichuan University(Engineering Science Edition),2015,47(4):22-30.
[14]陈乐求,张家生,陈俊桦.泥质板岩改良土物理力学性质试验[J].湖南理工学院学报(自然科学版),2017,30(1):63-68.CHEN Leqiu,ZHANG Jiasheng,CHEN Junhua.Test of physical and mechanical properties of improved argillite-slate soil[J].Journal of Hunan Institute of Science and Technology(Science and Technology),2017,30(1):63-68.
[15]陈乐求,陈俊桦,张家生,等.水泥改良泥质板岩土动力特性试验[J].中南大学学报(自然科学版),2017,48(7):1858-1865.CHEN Leqiu,CHEN Junhua,ZHANG Jiasheng,et al.Test of dynamic properties of argillite-slate soil improved by cement[J].Journal of Central South University(Science and Technology),2017,48(7):1858-1865.