长江科学院院报 ›› 2019, Vol. 36 ›› Issue (2): 77-80.DOI: 10.11988/ckyyb.20171038

• 岩土工程 • 上一篇    下一篇

筑堤清滩土石料大型抗剪强度试验研究

张挺1,3,温勇2,4,杜秀忠1,3,孙昌利1,3,王艳丽5,潘家军5   

  1. 1.广东省水利水电科学研究院,广州 510610;
    2.中山大学 地球科学与工程学院,广州 510275;
    3.广东省岩土工程技术研究中心,广州 510610;
    4.仲恺农业工程学院 城乡建设学院,广州 510225;
    5.长江科学院 水利部岩土力学与工程重点实验室,武汉 430010
  • 收稿日期:2017-09-08 修回日期:2017-11-02 出版日期:2019-02-01 发布日期:2019-03-11
  • 通讯作者: 温 勇(1987-),男,江西吉安人,高级工程师,博士,主要从事土的本构模型及原位试验等方面的研究工作。E-mail:wy876633@163.com
  • 作者简介:张 挺(1970-) ,男,广东惠东人,教授级高级工程师,博士,主要从事岩土工程的咨询设计工作。E-mail:308665596@qq.com
  • 基金资助:
    广东省水利科技创新项目(2015-11);国家自然科学基金面上项目(51779017);长江科学院中央级公益科研院所基本科研业务费项目(CKSF2017023/YT)

Large-scale Shear Strength Tests of Earth-rock Embankment Material from River Dredging

ZHANG Ting1,3, WEN Yong2,4, DU Xiu-zhong1,3,SUN Chang-li1,3,WANG Yan-li5,PAN Jia-jun5   

  1. 1.Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, China;
    2.School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;
    3.Geotechnical Engineering Technology Center of Guangdong Province, Guangzhou 510610, China;
    4.College of Urban and Rural Construction, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China;
    5.Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute, Wuhan 430010, China
  • Received:2017-09-08 Revised:2017-11-02 Online:2019-02-01 Published:2019-03-11

摘要: 以广东省韶关市某中小河流治理工程的清滩土石料为研究对象,开展室内大型三轴剪切试验和大型直剪试验,研究不同试验方法下清滩土石料的抗剪强度特性。大型三轴剪切试验结果表明,清滩土石料强度随着应变的增加逐渐增加,无明显峰值强度,为弱硬化型,同时抗剪强度随着围压的增大而增大,体应变呈剪缩型变化;大型直剪试验结果表明,土石混合料在不同垂直压力下均具有一定的峰值强度,呈现微弱的应变软化特性;不同试验方法确定的清滩土石料抗剪强度参数对比结果为,大型三轴剪切试验所得到的抗剪强度参数最大,大型常规直剪试验次之,大型叠环式剪切试验最小。研究成果表明,清滩土石料具有较好的抗剪强度,防渗处理好后可作为较好的筑堤材料。

关键词: 清滩土石料, 筑堤, 抗剪强度参数, 大型三轴剪切试验, 大型直剪试验, 中小河流治理

Abstract: The shear strength characteristics of earth-rock material from river dredging obtained from different test methods are examined via large-scale indoor triaxial shear test and direct shear test. The earth-rock material from river dredging in the harnessing project of a small and medium-sized river in Shaoguan, Guangdong Province is taken as a case study. The results of large-scale triaxial shear test show that the shear strength of the earth-rock material from river dredging increases with the rising of strain and confining pressure, displaying weak hardening with no obvious peak strength. The results of large-scale direct shear test show that peak strength of the earth-rock material from river dredging exists under different vertical pressures, characterized by a weak strain softening. Comparison of shear strength parameters among different test methods implies that the shear strength parameters obtained from large-scale triaxial shear test is the largest, followed by those of conventional direct shear test and piled ring shear test in sequence. The research results prove that the earth-rock material from river dredging is of good shear strength, hence can be used as good embankment material after anti-seepage treatment.

Key words: earth-rock materials from river dredging, embankment, shear strength parameters, large-scale triaxial shear test, large-scale direct shear test, governance of small and medium-sized rivers

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