A novel simple shear apparatus with stacked steel laminations for fine grained soil
-
摘要: 研制了一种适用于细粒土的新型叠片式单剪仪。该单剪仪试样室采用若干内部尺寸长×宽为100 mm×40 mm的回字形叠片,有效地减小了常规圆形叠环式单剪仪压力室剪切时试样侧倾、受力严重不均的问题。销钉式变形控制杆能使试样剪切变形均匀,叠片试样室外围的导向侧板控制了剪力的方向性,新型的杠杆支点结构有效解决杠杆倾斜时加载杆力传递变化的问题。该单剪仪结构稳定、易于操作,集应力/应变控制式功能于一身,可实现对细粒土的均匀剪切。基于该单剪仪对某黏土进行了抗剪强度和剪切蠕变试验,分析了黏土的抗剪强度参数和剪切蠕变规律,初步验证了该单剪仪的优良工作性能。Abstract: A new simple shear apparatus is invented for fine grained soil based on the existing designs. Some rectangular- stacked steel laminations are used for the new simple shear apparatus. The internal dimensions of the steel laminations are 100 mm in length and 40 mm in width. It effectively eliminates the common issues such as sample tilting and uneven stress distribution during shear testing compared to the conventional simple shear apparatuses. The pin type deformation control rod can ensure uniform shear deformation of the specimen. The guiding side plate around the specimen chamber controls the direction of the shear force. The new lever support structure effectively solves the problem of load rod force transmission because the lever is tilted. The simple shear apparatus is featured with stable structure and easy operation. It combines the stress/strain control functions into one unit, allowing for the uniform shear testing of fine-grained soils. The shear strength tests and shear creep tests on clay are carried out using the novel simple shear apparatus. Meanwhile, the parameters of shear strength and the laws of creep are analyzed. The test results validate the good performance of the novel simple shear apparatus.
-
-
表 1 土体的基本物理力学参数
Table 1 Fundamental physical-mechanical parameters of soil
Gs w/% ρ/(g·cm-3) e wL/% wP/% Il Ip 2.75 32.93 1.91 0.879 37.08 17.67 0.74 19.41 表 2 不同竖向固结压力下两组重复试验的抗剪强度
Table 2 Shear strengths under different vertical pressures of two repeated tests
竖向固结压力/kPa 抗剪强度/kPa 均值强度/kPa 试验一 试验二 100 65.7 65.8 65.8 200 140.2 136.5 138.4 500 310.8 312.8 311.8 1000 494.1 481.9 488.0 表 3 不同竖向压力下小车底部的摩擦力
Table 3 Frictional forces for box and rail at different vertical pressures
固结应力/kPa 法向力/N 摩擦力/N 抗剪强度/kPa 剪力/N 摩擦力占比/% 100 392 1.058 65.8 263.2 0.41 200 784 2.117 138.4 553.6 0.38 500 1960 5.292 311.8 1247.2 0.42 1000 3920 10.584 488.0 1952.0 0.54 -
[1] 吴明, 傅旭东, 夏唐代, 等. 压实土不固结不排水单剪、直剪试验对比[J]. 岩石力学与工程学报, 2006, 25(增刊2): 4147-4152. WU Ming, FU Xudong, XIA Tangdai, et al. Comparison of unconsolidated and undrained simple shear and direct shear tests of compacted soil[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(S2): 4147-4152. (in Chinese)
[2] 吴则祥, 陈佳莹, 尹振宇. 考虑砂土初始各向异性的单剪试验模拟分析[J]. 岩土工程学报, 2021, 43(6): 1157-1165. doi: 10.11779/CJGE202106020 WU Zexiang, CHEN Jiaying, YIN Zhenyu. Finite element simulation of simple shear tests considering inherent anisotropy[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(6): 1157-1165. (in Chinese) doi: 10.11779/CJGE202106020
[3] 原鹏博. 城市固体废弃物大型单剪试验研究[D]. 兰州: 兰州大学, 2011. YUAN Pengbo. Large-scale Simple Shear Testing of Municipal Solid Waste[D]. Lanzhou: Lanzhou University, 2011. (in Chinese)
[4] 余世章. 钙质砂单剪试验及宏细观力学分析[D]. 天津: 天津大学, 2018. YU Shizhang. The Simple Shear Test of Carbonate Sand and Macroscopic and Microscopic Mechanical Analysis[D]. Tianjin: Tianjin University, 2018. (in Chinese)
[5] XU D S, LIU H B, RUI R, et al. Cyclic and postcyclic simple shear behavior of binary sand-gravel mixtures with various gravel contents[J]. Soil Dynamics and Earthquake Engineering, 2019, 123: 230-241. doi: 10.1016/j.soildyn.2019.04.030
[6] MEDICUS G, KWA K A, CERFONTAINE B. A consistent calibration process for the Matsuoka–Nakai friction angle under direct simple shear conditions for clay hypoplasticity[J]. Computers and Geotechnics, 2022, 150: 104888. doi: 10.1016/j.compgeo.2022.104888
[7] ZHANG M, YANG Y M, ZHANG H W, et al. DEM and experimental study of bi-directional simple shear[J]. Granular Matter, 2019, 21(2): 24. doi: 10.1007/s10035-019-0870-1
[8] JIN H X, GUO L, SUN H L, et al. Undrained cyclic shear strength and stiffness degradation of overconsolidated soft marine clay in simple shear tests[J]. Ocean Engineering, 2022, 262: 112270. doi: 10.1016/j.oceaneng.2022.112270
[9] NONG Z Z, PARK S S, LEE D E. Comparison of sand liquefaction in cyclic triaxial and simple shear tests[J]. Soils and Foundations, 2021, 61(4): 1071-1085. doi: 10.1016/j.sandf.2021.05.002
[10] 潘东毅. 一种大型高精度单剪仪结构, CN203705277U[P]. 2014. PAN Dongyi. Large-Scale Simple Shear Testing of Municipal Soild Waste. CN203705277U[P]. 2014. (in Chinese)
[11] 冯大阔, 张建民. 粗粒土与结构接触面静动力学特性的大型单剪试验研究[J]. 岩土工程学报, 2012, 34(7): 1201-1208. http://cge.nhri.cn/article/id/14627 FENG Dakuo, ZHANG Jianmin. Monotonic and cyclic behaviors of coarse-grained soil-structure interface using large-scale simple shear device[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(7): 1201-1208. (in Chinese) http://cge.nhri.cn/article/id/14627
[12] 邵生俊, 王强, 吴飞洁. 一种新型动单剪仪的研发与试验验证[J]. 岩土力学, 2017, 38(6): 1841-1848. SHAO Shengjun, WANG Qiang, WU Feijie. Development and test verification of a new cyclic simple shear apparatus[J]. Rock and Soil Mechanics, 2017, 38(6): 1841-1848. (in Chinese)
[13] 王艳丽, 饶锡保, 潘家军, 等. 砂砾石垫层料与混凝土面板接触面特性的大型单剪试验研究[J]. 岩土工程学报, 2019, 41(8): 1538-1544. doi: 10.11779/CJGE201908019 WANG Yanli, RAO Xibao, PAN Jiajun, et al. Mechanical behaviors of interface between sand-gravel cushion material and concrete face slab by large-scale simple shear tests[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(8): 1538-1544. (in Chinese) doi: 10.11779/CJGE201908019
[14] 孙钧. 岩土材料流变及其工程应用[M]. 北京: 中国建筑工业出版社, 1999. SUN Jun. Rheology of Geotechnical Materials and its Engineering Application[M]. Beijing: China Architecture & Building Press, 1999. (in Chinese)
-
期刊类型引用(3)
1. 张明,胡栋科,谢敬礼,王赵明,李小明,周方亮,赵留义. 基于机器学习算法的高放废物处置库屏障材料膨胀性能演化研究. 辐射防护. 2025(02): 157-166 . 百度学术
2. 谈云志,魏康旭,祝雨,张金生,明华军. 球状石墨–膨润土压实后的导热与防渗性能. 岩石力学与工程学报. 2025(05): 1340-1348 . 百度学术
3. 郝丰富,马田田,于海文,韦昌富,田慧会,伊盼盼. 阳离子交换量对膨润土层间水化影响的试验研究. 岩土力学. 2024(09): 2611-2620 . 百度学术
其他类型引用(2)
-
其他相关附件