| 430 | 3 | 223 |
| 下载次数 | 被引频次 | 阅读次数 |
【目的】为了快速、准确地获取轻量土抗剪强度相关指标，确定不同直剪试验方法对轻量土抗剪强度的差异，【方法】通过快剪、固结快剪以及慢剪试验，分析了轻量土剪应力-剪切位移曲线、黏聚力和内摩擦角在不同剪切方法及不同配比下的变化规律。【结果】结果显示：轻量土的抗剪强度及抗剪强度指标随着其配比不同表现出一定的差异，其中，随着EPS颗粒体积比的增大，剪应力-剪切位移曲线由应变软化型转变为应变硬化型，轻量土抗剪强度大幅降低。随着水泥掺量的增加，轻量土抗剪强度总体呈现增大的趋势，同时轻量土黏聚力随EPS颗粒体积比增大而大幅减小，随水泥掺量的增大略有增大；内摩擦角随EPS颗粒体积比的增大急剧减小，随水泥掺量增大略微减小。其中以快剪试验为例，当水泥掺量为15%、EPS颗粒体积比由20%增长至40%和60%时，轻量土黏聚力相对减少量为22.20%、44.73%。【结论】结果表明，不同EPS颗粒体积比下，慢剪方法对轻量土试样黏聚力的变化较为敏感，而快剪方法对轻量土试样内摩擦角的变化较为敏感。与素土相比，三种直剪方法下得到的不同配比轻量土剪应力-剪切位移曲线形态、抗剪强度值均比较相近，实际工程中可用直剪快剪方法获取轻量土抗剪强度。
Abstract：[Objective] In order to obtain relevent parameters of light weight soil shear strength quickly and accurately, the influence of different direct shear method on the shear strength of light weight soil is studied. [Methods]Through the quick shear test, consolidated quick shear test and slow shear test, the variation laws of shear stress-shear displacement curve, cohesion and internal friction angle of the light weight soil under different shear testing method and different proportions. [Results] The result show that with the increase of EPS particle volume ratio, the shear strength and shear strength index of light weight soil show certain differences with its different ratio. The shear stress-shear displacement curve changes from strain softening type to strain hardening type, and the shear strength of light weight soil decreases significantly. With the increase of cement content, the shear strength of light weight soil shows an increasing trend generally. The cohesion of light weight soil decreases greatly with the increase of EPS particle volume ratio, and increases slightly with the increase of cement content. The internal friction angle decreases sharply with the increase of EPS particle volume ratio, and decreases slightly with the increase of cement content. Taking the quick shear test as an example, when the cement content is 15% and the EPS particle volume ratio increases from 20% to 40% and 60%, the cohesion of light weight soil decreases from 44.24 kPa to 34.42 kPa and 24.45 kPa, the absolute reduction is 9.82 kPa and 19.79 kPa, and the relative reduction is 22.20% and 44.73%. [Conclusion] Under different EPS particle volume ratios, the slow shear test method is sensitive to the cohesion change of light weight soil samples, while the quick shear test method is more sensitive to the internal friction angle change of light weight soil samples. Compared with soil, the shear stress-shear displacement curves and shear strength values of light weight soil in different proportion ratios obtained under the three different direct shear method are relatively similar. Thus, the shear strength of light weight soil can be obtained by quick shear test method in practical engineering.
[1] YAMADA S,NAGASAKA Y,NISHIDA N.Foamed particle light-weight soil with sand[J].Soil and Foundations,1989,37(2):25-30.
[2] 郭坤龙，储诚富，叶浩，等.铁尾矿砂-电石渣复合改良膨胀土的直剪试验研究[J].合肥工业大学学报(自然科学版),2020,43(9):1263-1268.GUO Kunlong,CHU Chengfu,YE Hao,et al.Study on direct shear strength of expansive soils improved by iron tailing sands and calcium carbide slag[J].Journal of Hefei University of Technology(Natural Science),2020,43(9):1263-1268.
[3] 侯天顺，徐光黎.EPS粒径对轻量土抗剪强度的影响规律[J].岩土工程学报，2011,33(10):1634-1641.HOU Tianshun,XU Guangli.Influence law of EPS size on shear strength of light weight soil[J].Chinese Journal of Geotechnical Engineering,2011,33(10):1634-1641.
[4] 高志傲，李萍，肖俊杰，等.利用常规直剪试验评价非饱和黄土抗剪强度[J].工程地质学报，2020,28(2):344-351.GAO Zhiao,LI Ping,XIAO Junjie,et al.Evaluation of shear strength of unsaturated loess using conventional direct shear test[J].Journal of Engineering Geology,2020,28(3):344-351.
[5] SHARMA M,SAMANTA M,SARKAR S.A study on interface shear behavior of soil nails from pullout and direct shear tests[J].International Journal of Physical Modelling in Geotechnics,2018:1-47.
[6] 刘飞禹，王攀，王军，等.不同剪切速率下格栅-土界面循环剪切及其后直剪特性[J].岩石力学与工程学报，2016,35(2):387-395.LIU Feiyu,WANG Pan,WANG Jun,et al.Cyclic and post-cyclic shear behavior of sand-geogrid interface under different shear rates[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(2):387-395.
[7] GRATCHEV I B,SASSA K.Shear strength of clay at different shear rates[J].Journal of Geotechnical and Geoenvironmental Engineering,2015,141(5):201-203.
[8] 毛瑞，杨和平.不同剪切速率下黏土的抗剪强度[J].中外公路，2018,38(1):309-312.MAO Rui,YANG Heping.Shear strength of clay at different shear rates[J].Journal of China & Foreign Highway,2018,38(1):309-312.
[9] 林敬兰，黄炎和，张德斌，等.水分对崩岗土体抗剪切特性的影响[J].水土保持学报，2013,27(3):55-58.LIN Jinlan,HUANG Yanhe,ZHANG Debing,et al.Influence of soil moisture content on shear characteristics of benggang[J].Journal of Soil and Water Conservation,2013,27(3):55-58.
[10] 申春妮，方祥位，王和文，等.吸力、含水率和干密度对重塑非饱和土抗剪强度影响研究[J].岩土力学，2009,30(5):1347-1351.SHEN Chunni,FANG Xiangwei,WANG Hewen,et al.Research on effects of suction,water content and dry density on shear strength of remolded unsaturated soils[J].Rock and Soil Mechanics,2009,30(5):1347-1351.
[11] 李保雄，苗天德.黄土抗剪强度的水敏感性特征研究[J].岩石力学与工程学报，2006,25(5):1003-1008.LI Baoxiong,MIAO Tiande.Research on water sensitivity of loess shear strength[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(5):1003-1008.
[12] 徐志伟，周国庆，刘志强，等.直剪试验的面积校正方法及误差分析[J].中国矿业大学学报，2007(5):658-662.XU Zhiwei,ZHOU Guoqin,LIU Zhiqiang,et al.Correcting method and error analysis for sample area in direct shear test[J].Journal of China University of Mining & Technology,2007(5):658-662.
[13] 刘海波，张丽华，林大超，等.直剪试验有效剪切面积动态变化的改进计算[J].沈阳建筑大学学报(自然科学版),2010,26(3):503-506.LIU Haibo,ZHANG Lihua,LIN Dachao,et al.The improved calculation of the dynamic changes of the effective shear area in the direct shear test[J].Journal of Shenyang Jianzhu University(Natural Science),2010,26(3):503-506.
[14] 滕超，王卫，谢鲁钧，等.一种控制直剪蠕变试验剪应力的简易装置[J].岩土力学，2014,35(10):3035-3040.TENG Chao,WANG Wei,XIE Lujun,et al.A kind of simple device controlling shear stress in direct shear creep experiment[J].Rock and Soil Mechanics,2014,35(10):3035-3040.
[15] 侯天顺，徐光黎.发泡颗粒混合轻量土抗剪强度特性试验研究[J].中国矿业大学学报，2010,39(4):534-540.HOU Tianshun,XU Guangli.Experimental study on the shear strength characteristics of foamed particle light weight soil[J].Journal of China University of Mining & Technology,2010,39(4):534-540.
[16] 朱伟，姬凤玲，李明东，等.轻质土密度、强度与材料组成的关系研究[J].岩土力学，2007,28(7):1411-1414.ZHU Wei,JI Fengling,LI Mingdong,et al.Relationships among density,strength and materials of lightweight treated soil[J].Rock and Soil Mechanics,2007,28(7):1411-1414.
[17] 侯天顺，徐光黎，楼建东.轻量砂抗剪强度特性三轴试验研究[J].中南大学学报(自然科学版),2011,42(11):3521-3529.HOU Tianshun,XU Guangli,LOU Jiandong.Triaxial compression test on shear strength characteristics of light weight sand[J].Journal of Central South University(Science and Technology),2011,42(11):3521-3529.
[18] 郭玉顺，陆爱萍，郭自力.多孔混凝土成分、孔结构与力学性能关系的研究[J].清华大学学报(自然科学版),1996,36(8):44-49.GUO Yushun,LU Aiping,GUO Zili.Study on the relationship between composition pore structure and mechanical properties of porous concrete[J].Journal of Tsinghua University(Science and Technology),1996,36(8):44-49.
[19] ERGENZINGER C,SEIFRIED R,EBERHARD P.A discrete element model predicting the strength of ballast stones[J].Computers and Structures,2012,108:3-13.
[20] BROSSE A M,JARDINE R J,NISHIMURA S.The undrained shear strength anisotropy of four Jurassic to Eocene stiff clays[J].Géotechnique,2017,67(8):1-19.
[21] NAGATOME T,HASHIMOTO T,OTANI J,et al.Absorption property evaluation of light weight soil with air foam due to different mixing conditions[J].Journal of the Society of Materials Science Japan,2010,59(1):68-73.
[22] ERGENZINGER C,SEIFRIED R,EBERHARD P.A discrete element model predicting the strength of ballast stones[J].Computers and Structures,2012,108:3-13.
[23] 侯天顺，郭鹏斐，杨凯旋，等.发泡颗粒混合轻量土静止土压力特性及计算方法研究[J].岩土工程学报：1-11.http://kns.cnki.net/kcms/detail/32.1124.TU.20220525.1517.002.html.HOU Tianshun,GUO Pengfei,YANG Kaixuan,et al.Characteristics and calculated method of earth pressure at rest of foamed particles light weight soil[J].Chinese Journal of Geotechnical Engineering,1-11.http://kns.cnki.net/kcms/detail/32.1124.TU.20220525.1517.002.html.
[24] HOU T S.Influence of expanded polystyrene size on deformation characteristics of light weight soil[J].Journal of Central South University,2012,19(11):3320-3328.
[25] 侯天顺.特征含水率对轻量土基本性质的影响规律[J].岩土力学，2012,33(9):2581-2587.HOU Tianshun.Influence law of characteristic water content on basic properties of light weight soil[J].Rock and Soil Mechanics,2012,33(9):2581-2587.
[26] BEESLEY M W,VARDANEGA P J.Parameter variability of undrained shear strength and strain using a database of reconstituted soil tests[J].Canadian Geotechnical Journal,2020,57(8):1247-1255.
[27] 侯天顺，杨凯旋.挡土墙后EPS颗粒混合轻量土填料静止土压力特性模型试验研究[J].岩土力学，2021,42(12):3249-3259.HOU Tianshun,YANG Kaixuan.Model test on earth pressure at rest of light weight soil mixed with EPS particles behind a retaining wall[J].Rock and Soil Mechanics,2021,42(12):3249-3259.
[28] 侯天顺，崔奕翔.EPS颗粒混合轻量土的动变形特性及修正Hardin-Drnevich模型研究[J].岩土工程学报，2021,43(9):1602-1611.HOU Tianshun,CUI Yixiang.Dynamic deformation characteristics and modified Hardin-Drnevich model for light weight soil mixed with EPS particles[J].Chinese Journal of Geotechnical Engineering,2021,43(9):1602-1611.
基本信息:
DOI：10.13928/j.cnki.wrahe.2023.04.015
中图分类号:TU41
引用信息:
[1]郭鹏斐,侯天顺,刘茜,等.直剪试验方法对轻量土抗剪强度的影响规律研究[J],2023,54(04):161-170.DOI:10.13928/j.cnki.wrahe.2023.04.015.
基金信息:
国家自然科学基金项目(51509211);; 中国博士后基金项目(2016M602863);; 陕西省留学人员科技活动择优资助项目(2018031);; 陕西省社会发展科技攻关项目(2015SF260);; 陕西省博士后基金项目(2017BSHYDZZ50);; 陕西省自然科学基础研究计划引汉济渭联合基金项目(2021JLM-51);; 西安市岩土与地下工程重点实验室开放基金项目(XKLGUEKF21-02);; 中央高校基本科研业务费专项资金项目(2452020169)
2022-08-26
2022
2023-03-28
2023
2